Tue·Aug 13, 2019Tuesday·August 13, 2019

1. 01*

   Explanation of electron and muon g-2 anomalies in the MSSM

   Marcin Badziak🇵🇱 · Kazuki Sakurai🇵🇱

   The current experimental values of anomalous magnetic moments of muon and electron deviate from the Standard Model predictions by few standard deviations, which might be a hint of new physics. The sizes and signs of these deviations are different and opposite between the electron and muon, which makes it difficult to explain both of these anomalies in a consistent model without introducing large flavour-violating effects. It is shown that they can be simultaneously explained in the Minimal Supersymmetric Standard Model (MSSM) by arranging the sizes of bino-slepton and chargino-sneutrino contributions differently between the electron and muon sectors. The MSSM spectrum features very light selectrons and wino-like chargino, while they can evade LHC constraints due to degenerate spectra.

   hep-phJHEP(2019)·105 citations
2. 02*

   Sivers Asymmetry in Photoproduction of $J/\psi$ and Jet at the EIC

   Raj Kishore🇮🇳 · Asmita Mukherjee🇮🇳 · Sangem Rajesh🇮🇹

   We calculate the Sivers asymmetry in the photoproduction of almost back-to-back $J/\psi$-jet pair in the process $e{p}^{\uparrow }\to J/\psi +\mathrm{jet}+X$, which will be possible at the future planned electron-ion collider (EIC). We use the framework of generalized parton model (GPM), and NRQCD for calculating the $J/\psi$ production rate. We include contributions from both color singlet and color octate states in the asymmetry. We obtain sizable Sivers asymmetry that can be promising to determine the gluon Sivers function. We also investigate the effect of TMD evolution on the asymmetry.

   hep-phPRD(2020)·34 citations
3. 03*

   A $\mu$-$\tau$-philic Higgs doublet confronted with the muon g-2, $\tau$ decays and LHC data

   Lei Wang🇨🇳 · Yang Zhang🇦🇺

   We propose a two-Higgs-doublet model in which one Higgs doublet has the same interactions with fermions as the SM, and another Higgs doublet only has the $\mu$-$\tau$ LFV interactions. Assuming that the Yukawa matrices are real and symmetric, we impose various relevant theoretical and experimental constraints, and find that the excesses of muon $g-2$ and lepton flavour universality in the $\tau$ decays can be simultaneously explained in the region of small mass splittings between the heavy CP-even Higgs and the CP-odd Higgs ($m_A>m_H$). The multi-lepton event searches at the LHC can sizably reduce the mass ranges of extra Higgses, and $m_H$ is required to be larger than 560 GeV.

   hep-phPRD(2019)·15 citations
4. 04*

   The Polarized Three-Loop Anomalous Dimensions from On-Shell Massive Operator Matrix Elements

   A. Behring🇩🇪 · J. Blümlein🇩🇪 · A. De Freitas🇩🇪 · A. Goedicke🇩🇪 · S. Klein🇩🇪 · A. von Manteuffel🇺🇸 · C. Schneider🇦🇹 · K. Schönwald🇩🇪

   We calculate all contributions $\propto T_F$ to the polarized three-loop anomalous dimensions in the M-scheme using massive operator matrix elements and compare to results in the literature. This includes the complete anomalous dimensions ${\gamma }_{qq}^{(2),\mathrm{PS}}$ and ${\gamma }_{qg}^{(2)}$. We also obtain the complete two-loop polarized anomalous dimensions in an independent calculation. While for most of the anomalous dimensions the usual direct computation methods in Mellin $N$-space can be applied since all recurrences factorize at first order, this is not the case for ${\gamma }_{qg}^{(2)}$. Due to the necessity of deeper expansions of the master integrals in the dimensional parameter $\epsilon =D-4$, we had to use the method of arbitrary high moments to eliminate elliptic contributions in intermediate steps. 4000 moments were generated to determine this anomalous dimension and 2640 moments turned out to be sufficient. As an aside, we also recalculate the contributions $\propto T_F$ to the three-loop QCD $\beta$-function.

   hep-phhep-thNPB(2019)·51 citations
5. 05*

   Transverse Parton Distribution and Fragmentation Functions at NNLO: the Quark Case

   Ming-Xing Luo🇨🇳 · Xing Wang🇨🇳 · Xiaofeng Xu🇨🇳 · Li Lin Yang🇨🇳 · Tong-Zhi Yang🇨🇳 · Hua Xing Zhu🇨🇳

   We revisit the calculation of perturbative quark transverse momentum dependent parton distribution functions and fragmentation functions using the exponential regulator for rapidity divergences. We show that the exponential regulator provides a consistent framework for the calculation of various ingredients in transverse momentum dependent factorization. Compared to existing regulators in the literature, the exponential regulator has a couple of advantages which we explain in detail. As a result, the calculation is greatly simplified and we are able to obtain the next-to-next-to-leading order results up to $\mathcal{O}({ϵ}^2)$ in dimensional regularization. These terms are necessary for a higher order calculation which is made possible with the simplification brought by the new regulator. As a by-product, we have obtained the two-loop quark jet function for the Energy-Energy Correlator in the back-to-back limit, which is the last missing ingredient for its N${}^3$LL resummation.

   hep-phJHEP(2019)·99 citations
6. 06*

   Constraining new physics from Higgs measurements with Lilith: update to LHC Run 2 results

   Sabine Kraml🇫🇷 · Tran Quang Loc🇻🇳 · Dao Thi Nhung🇻🇳 · Le Duc Ninh🇻🇳

   Lilith is a public Python library for constraining new physics from Higgs signal strength measurements. We here present version 2.0 of Lilith together with an updated XML database which includes the current ATLAS and CMS Run 2 Higgs results for 36/fb. Both the code and the database were extended from the ordinary Gaussian approximation employed in Lilith-1.1 to using variable Gaussian and Poisson likelihoods. Moreover, Lilith can now make use of correlation matrices of arbitrary dimension. We provide detailed validations of the implemented experimental results as well as a status of global fits for reduced Higgs couplings, Two-Higgs-doublet models of Type I and Type II, and invisible Higgs decays. Lilith-2.0 is available on GitHub and ready to be used to constrain a wide class of new physics scenarios.

   hep-phhep-exSciPost Phys.(2019)·69 citations
7. 07*

   Relating the Cabibbo angle to $\tan \beta$ in a two Higgs-doublet model

   Dipankar Das🇸🇪

   In a two Higgs-doublet model with $D_4$ flavor symmetry, we establish a relation between $\tan \beta$ and the Cabibbo angle. Due to a small number of parameters, the quark Yukawa sector of the model is very predictive. The flavor changing neutral currents are small enough to allow for relatively light nonstandard scalars to pass through the flavor constraints.

   hep-phPRD(2019)·7 citations
8. 08*

   F2F, a model-independent method to determine the mass and width of a particle in the presence of interference

   Li-Gang Xia🇬🇧

   It is generally believed that any particle to be discovered will have a TeV-order mass. Given its great mass, it must have a large decay width. Therefore, the interference effect will be very common if they and the Standard-Model (SM) particles contribute to the same final state.However, the interference effect could make a new particle show up not like a resonance, and it is difficult to search and measure its properties. In this work, a model-independent method, F2F (Fit To Fourier coefficients), is proposed to search for an unknown resonance and to determine its mass ($M$) and width ($\Gamma$) in the presence of interference. Basically we express the sum of reosnant signal and the interference as a cosine Fourier series and relate the Fourier coefficients with the mass and width. The relation is based on the general propagator form, $1/(x^2-M^2+iM\Gamma )$. Thus it does not need any signal model. Toy experiments show that the obtained mass and width agree well with the inputs with a similar precision as using an explicit signal model. We also show that we can apply this method to measure the Stardard-Model Higgs width and to make statistic interpretation in searching for new resonance allowing for interference.

   hep-phhep-ex0 citations
9. 09*

   Top quark mass effects in $gg\to ZZ$ at two loops and off-shell Higgs interference

   Ramona Gröber🇩🇪 · Andreas Maier🇩🇪 · Thomas Rauh🇨🇭

   We consider top-quark mass effects in the Higgs-interference contribution to $Z$-boson pair production in gluon fusion. While this production mechanism is formally of next-to-next-to leading order, its contribution is numerically important above the top threshold $M_{ZZ}^2=4m_t^2$. This region is essential to constrain the width of the Higgs boson and good control over the top-quark mass dependence is crucial. We determine the form factors that are relevant for the interference contribution at two-loop order using a method based on a conformal mapping and Padé approximants constructed from the expansions of the amplitude for large top mass and around the top threshold.

   hep-phPRD(2019)·22 citations
10. 10*

    Renormalisation in Quantum Field Theory

    Sunil Mukhi🇮🇳

    An introductory review, based on a series of lectures delivered at the XXXI SERC School, Kalyani University, 9--18 January 2017.

    hep-phhep-th1 citation
11. 11*

    Big Bang Nucleosynthesis Hunts Chameleon Dark Matter

    Hua Chen🇨🇳 · Taishi Katsuragawa🇨🇳 · Shinya Matsuzaki🇨🇳 · Taotao Qiu🇨🇳

    We study the chameleon field dark matter, dubbed \textit{scalaron}, in $F(R)$ gravity in the Big Bang Nucleosynthesis (BBN) epoch. With an $R^2$-correction term required to solve the singularity problem for $F(R)$ gravity, we first find that the scalaron dynamics is governed by the $R^2$ term and the chameleon mechanism in the early universe, which makes the scalaron physics model-independent regarding the low-energy scale modification. In viable $F(R)$ dark energy models including the $R^2$ correction, our analysis suggests the scalaron universally evolves in a way with a bouncing oscillation irrespective of the low-energy modification for the late-time cosmic acceleration. Consequently, we find a universal bound on the scalaron mass in the BBN epoch, to be reflected on the constraint for the coupling strength of the $R^2$ term, which turns out to be more stringent than the one coming from the fifth force experiments. It is then shown that the scalaron naturally develops a small enough fluctuation in the BBN epoch, hence can avoid the current BBN constraint placed by the latest Planck 2018 data, and can also have a large enough sensitivity to be hunted by the BBN, with more accurate measurements for light element abundances as well as the baryon number density fraction.

    hep-phastro-ph.COgr-qchep-thJHEP(2020)·14 citations
12. 12*

    Sequential hyperon decays in the reaction $e^{+}{e}^{-}\to {\Sigma }^0{\bar{\Sigma }}^0$

    Göran Fäldt🇸🇪 · Karin Schönning🇸🇪

    We report on a study of the sequential hyperon decay ${\Sigma }^0\to \Lambda \gamma ;\Lambda \to p{\pi }^{-}$ and its corresponding anti-hyperon decay. We derive a multi-dimentional and model-independent formalism for the case when the hyperons are produced in the reaction $e^{+}{e}^{-}\to {\Sigma }^0{\bar{\Sigma }}^0$. Cross-section distributions are calculated using the folding technique. We also study sequential decays of single-tagged hyperons.

    hep-phPRD(2020)·10 citations
13. 13*

    Event multiplicity, transverse momentum and energy dependence of charged particle production, and system thermodynamics in $pp$ collisions at the Large Hadron Collider

    Rutuparna Rath🇮🇳 · Arvind Khuntia🇵🇱 · Raghunath Sahoo🇮🇳 · Jean Cleymans🇿🇦

    In the present work, we study the recent collision energy and multiplicity dependence of the charged particle transverse momentum spectra as measured by the ALICE collaboration in $pp$ collisions at $\sqrt{s}$ = 5.02 and 13 TeV using the non-extensive Tsallis distribution and the Boltzmann-Gibbs Blast Wave (BGBW) model. A thermodynamically consistent form of the Tsallis distribution is used to extract the kinetic freeze-out parameters from the transverse momentum spectra of charged particles at mid-rapidity. In addition, a comprehensive study of fitting range dependence of transverse momentum spectra on the freeze-out parameters is done using Tsallis statistics. The applicability of BGBW model is verified by fitting the transverse momentum spectra of the bulk part ($\sim 2.5\mathrm{GeV}/c$)for both 5.02 and 13 TeV energies and also in different multiplicity classes. The radial flow, $<\beta >$ is almost independent of collision energy and multiplicity whereas the behavior of kinetic freeze-out temperature significantly depends on multiplicity classes. It is found that the Tsallis distribution generally leads to a better description for the complete transverse momentum spectra whereas the BGBW model explains the bulk part of the system.

    hep-phhep-exnucl-exnucl-thJ.Phys.G(2020)·32 citations
14. 14*

    Derivation of the sterile neutrino Boltzmann equation from quantum kinetics

    Lucas Johns🇺🇸

    An extensive, growing body of work has been penned on cosmologies that include one or more sterile neutrinos. Early entries in the literature formulated a Boltzmann-like equation describing sterile-neutrino production in a way that bypasses the numerical tracking of high-frequency complex phases, and meticulous quantum-kinetic analyses shortly thereafter put the formula on firmer ground. A new and more direct derivation is given here, showing that the equation follows almost immediately from a quantum relaxation-time approximation and an expansion in the mixing angle. Besides reproducing the desired result, the relaxation ansatz captures to a high degree of accuracy the interlaced dynamics of oscillations, decoherence, and plasma repopulation. Successes and limitations of the semiclassical equation are illustrated numerically and are shown to reflect the accuracy of the approximations employed in the derivation. The inclusion of interactions among the sterile neutrinos is also briefly addressed.

    hep-phastro-ph.COPRD(2019)·14 citations
15. 15*

    Relaxation of Higgs mass and cosmological constant with four-form fluxes and reheating

    Hyun Min Lee🇰🇷

    We consider the most general effective action for the four-form fluxes in the Standard Model coupled to gravity. The Higgs mass parameter can be relaxed to a correct value due to the four-form coupling to the Higgs field and it stops changing due to an extremely suppressed transition probability from the observed cosmological constant to AdS space. We first introduce a non-minimal four-form coupling to gravity and discuss the role of a new scalar field as the inflaton and the conditions for a successful reheating at the end of relaxation.

    hep-phhep-thJHEP(2020)·16 citations
16. 16*

    Fermion Dark Matter and Radiative Neutrino Masses from Spontaneous Lepton Number Breaking

    Cesar Bonilla🇩🇪 · Leon M.G. de la Vega🇲🇽 · J. M. Lamprea🇲🇽 · Roberto A. Lineros🇨🇱 · Eduardo Peinado🇲🇽

    In this paper, we study the viability of having a fermion Dark Matter particle below the TeV mass scale in connection to the neutrino mass generation mechanism. The simplest realization is achieved within the scotogenic model where neutrino masses are generated at the 1-loop level. Hence, we consider the case where the dark matter particle is the lightest ${\mathbb{Z}}_2$-odd Majorana fermion running in the neutrino mass loop. We assume that lepton number is broken dynamically due to a lepton number carrier scalar singlet which acquires a non-zero vacuum expectation value. In the present scenario the Dark Matter particles can annihilate via $t$- and $s$-channels. The latter arises from the mixing between the new scalar singlet and the Higgs doublet. We identify three different Dark Matter mass regions below 1 TeV that can account for the right amount of dark matter abundance in agreement with current experimental constraints. We compute the Dark Matter-nucleon spin-independent scattering cross-section and find that the model predicts spin-independent cross-sections ``naturally'' dwelling below the current limit on direct detection searches of Dark Matter particles reported by XENON1T.

    hep-phNew J.Phys.(2020)·26 citations
17. 17*

    Quantum break in models of axion dark matter

    R. F. Sawyer🇺🇸

    A system of light axions comprising a classical axion field, one candidate for dark matter, has an instability that can rapidly mix in photon pairs in a coherent fashion if initiated by a quantum break (which eliminates the need for seeds.) Adding more photon states, such as a multiplicity of angles for the case of the axion field at rest, reduces the argument of a logarithmic factor in the mixing time by orders of magnitude. Admitting multiple photon states, all within a window of instability, leads to a synchronization effect that appears to nullify conventional red-shift limitations. Even the fully developed states of the electromagnetic field produced are highly non-classical; they can be looked on as quantum superpositions of different nearly-classical macroscopic systems.

    hep-ph2 citations
18. 18*

    Generalised P and CP transformations in the 3-Higgs-doublet model

    M. Maniatis🇨🇱 · O. Nachtmann🇩🇪

    We study generalised P and CP transformations in the three-Higgs-doublet model (3HDM) with Higgs and gauge fields only. We find that there are two equivalence classes, with respect to flavour transformations, of generalised P transformations and there is only one class of CP transformations. We discuss the conditions the potential has to satisfy in order to be invariant under these transformations. We apply the method of bilinears which we briefly review. We discuss the relation to the conventional basis, where the potential is written in terms of scalar products of the doublet fields. In particular we reproduce the known result that a potential is invariant under CP transformations if and only if there is a conventional basis where all parameters are real. Eventually we study standard P and CP transformations in the $n$-Higgs-doublet model (nHDM). We show that for the bilinears of the nHDM the standard CP transformation corresponds to a diagonal linear transformation with only $\pm 1$ as diagonal elements. We give this matrix explicitly for arbitrary $n$.

    hep-phPRD(2019)·1 citation
19. 19*

    Type III Seesaw for Neutrino Masses in $U(1{)}_{B-L}$ Model with Multi-component Dark Matter

    Anirban Biswas🇮🇳 · Debasish Borah🇮🇳 · Dibyendu Nanda🇮🇳

    We propose a $B-L$ gauged extension of the Standard Model where light neutrino masses arise from type III seesaw mechanism. Unlike the minimal $B-L$ model with three right handed neutrinos having unit lepton number each, the model with three fermion triplets is however not anomaly free. We show that the leftover triangle anomalies can be cancelled by two neutral Dirac fermions having fractional $B-L$ charges, both of which are naturally stable by virtue of a remnant ${\mathbb{Z}}_2\times {\mathbb{Z}}_2^{\prime }$ symmetry, naturally leading to a two component dark matter scenario without any ad-hoc symmetries. We constrain the model from all relevant phenomenological constraints including dark matter properties. Light neutrino mass and collider prospects are also discussed briefly. Due to additional neutral gauge bosons, the fermion triplets in type III seesaw can have enhanced production cross section in collider experiment.

    hep-phJHEP(2019)·44 citations
20. 20*

    Form factors of $V^{\prime }\to V^{\prime \prime }$ transition within the light-front quark models

    Qin Chang🇨🇳 · Li-Ting Wang🇨🇳 · Xiao-Nan Li🇨🇳

    In this paper, we calculate the matrix element and form factors of vector-to-vector ($V^{\prime }\to V^{\prime }$) transition within the standard light-front~(SLF) and covariant light-front~(CLF) quark models~(QMs), and investigate the self-consistency and Lorentz covariance of the CLF QM within two types of correspondences between the manifest covariant Bethe-Salpeter approach and the LF approach. The zero-mode and valence contributions to the form factors of $V^{\prime }\to V^{\prime }$ transition in the CLF QM and their relation to the SLF results are analyzed, and the main conclusions obtained via the decay constants of vector and axial-vector mesons and form factors of $P\to V$ transition in the previous works are confirmed again. Furthermore, we present our numerical predictions for the form factors of $c\to (q,s)$ ($q=u,d$) induced $D^{\ast }\to (K^{\ast },\rho )$, $D_s^{\ast }\to (\varphi ,K^{\ast })$, $J/\Psi \to (D_s^{\ast },D^{\ast })$, $B_c^{\ast }\to (B_s^{\ast },B^{\ast })$ transitions and $b\to (q,s,c)$ induced $B^{\ast }\to (D^{\ast },K^{\ast },\rho )$, $B_s^{\ast }\to (D_s^{\ast },\varphi ,K^{\ast })$, $B_c^{\ast }\to (J/\Psi ,D_s^{\ast },D^{\ast })$, ${\rm Y}(1S)\to (B_c^{\ast },B_s^{\ast },B^{\ast })$ transitions, which can be applied further to the relevant phenomenological studies of meson decays.

    hep-phhep-exJHEP(2019)·35 citations
21. 21*

    Light particle and quark chemical potentials from negatively to positively charged particle yield ratios corrected by removing strong and weak decays

    Hai-Ling Lao🇨🇳 · Ya-Qin Gao🇨🇳 · Fu-Hu Liu🇨🇳

    The yield ratios of negatively to positively charged pions (${\pi }^{-}/{\pi }^{+}$), negatively to positively charged kaons ($K^{-}/K^{+}$), and anti-protons to protons ($\bar{p}/p$) produced in mid-rapidity interval in central gold-gold (Au-Au) collisions, central lead-lead (Pb-Pb) collisions, and inelastic (INEL) or non-single-diffractive (NSD) proton-proton ($pp$) collisions, as well as in forward rapidity region in INEL $pp$ collisions are analyzed in the present work. Over an energy range from a few GeV to above 10 TeV, the chemical potentials of light flavor particles (pion, kaon, and proton) and quarks (up, down, and strange quarks) are extracted from the mentioned yield ratios in which the contributions of strong decay from high-mass resonance and weak decay from heavy flavor hadrons are removed. Most energy dependent chemical potentials show the maximum at about 4 GeV, while the energy dependent yield ratios do not show such an extremum.

    hep-phhep-exnucl-exnucl-thAdv.High Energy Phys.(2020)·4 citations
22. 22*

    Bulk Properties of the System Formed in Au+Au Collisions at $\sqrt{s_{\mathrm{NN}}}$ = 14.5 GeV

    STAR Collaboration: J. Adam🇺🇸 · L. Adamczyk🇵🇱 · J. R. Adams🇺🇸 · J. K. Adkins🇺🇸 · G. Agakishiev🇷🇺 · M. M. Aggarwal🇮🇳 · Z. Ahammed🇮🇳 · I. Alekseev🇷🇺 · D. M. Anderson🇺🇸 · R. Aoyama🇯🇵 · A. Aparin🇷🇺 · E. C. Aschenauer🇺🇸 and 336 other authors

    We report systematic measurements of bulk properties of the system created in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 14.5 GeV recorded by the STAR detector at the Relativistic Heavy Ion Collider (RHIC).The transverse momentum spectra of ${\pi }^{\pm }$, $K^{\pm }$ and $p(\bar{p})$ are studied at mid-rapidity ($|y|<0.1$) for nine centrality intervals. The centrality, transverse momentum ($p_T$),and pseudorapidity ($\eta$) dependence of inclusive charged particle elliptic flow ($v_2$), and rapidity-odd charged particles directed flow ($v_1$) results near mid-rapidity are also presented. These measurements are compared with the published results from Au+Au collisions at other energies, and from Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV. The results at $\sqrt{s_{\mathrm{NN}}}$ = 14.5 GeV show similar behavior as established at other energies and fit well in the energy dependence trend. These results are important as the 14.5 GeV energy fills the gap in ${\mu }_B$, which is of the order of 100 MeV,between $\sqrt{s_{\mathrm{NN}}}$ =11.5 and 19.6 GeV. Comparisons of the data with UrQMD and AMPT models show poor agreement in general.

    ↳ nucl-exhep-exhep-phPRC(2020)·73 citations
23. 23*

    Towards degeneracy breaking of early universe models

    Ze Luan🇨🇳 · Taotao Qiu🇨🇳

    There are many possibilities of scenarios in the early universe, which can give rise to the same observational signals due to the degeneracy among each other, caused by equivalence under the conformal transformations. In order to break the degeneracy, in this paper we take into account the so-called "frame-invariant variables" proposed by A. Ijjas and P. J. Steinhardt in \cite{Ijjas:2015zma}. We discuss how the different scenarios will distribute in different parametric space constructed from those variables, waiting for the judgement of real observations in the future. Several concrete models with explicit non-minimal coupling functions are also discussed.

    ↳ gr-qcastro-ph.COhep-phhep-thPRD(2020)·2 citations
24. 24*

    Radiative parton energy loss and baryon stopping in $AA$ collisions

    B.G. Zakharov🇷🇺

    We study the radiative energy loss contribution to proton stopping in $AA$ collisions. The analyses is performed within the light-cone path integral approach to induced gluon emission. We have found that the radiative correction can fill in partly the midrapidity dip in the net proton rapidity distribution in $AA$ collisions at $\sqrt{s}\sim 10$ GeV. We argue that at $\sqrt{s}\sim 10$ GeV the net proton fluctuations at midrapidity may be dominated by the initial fluctuations of the proton flow, which, to a good accuracy, should be binomial.

    ↳ nucl-thhep-phJETP Lett.(2019)·3 citations
25. 25*

    Improving cosmological parameter estimation with the future 21 cm observation from SKA

    Jing-Fei Zhang🇨🇳 · Li-Yang Gao🇨🇳 · Dong-Ze He🇨🇳 · Xin Zhang🇨🇳

    Future observations of 21 cm emission from neutral hydrogen survey will become a promising approach to probe the large scale structure of Universe. In this paper, we investigate the impacts of Square Kilometer Array (SKA) 21 cm observation on the estimation of cosmological parameters. We use the simulated data of the baryonic acoustic oscillation (BAO) measurements based on the future SKA experiment with the intensity mapping (IM) technique to do the analysis. For the current observations, we use the latest cosmic microwave background (CMB) observation from {\it Planck} 2018, the optical BAO measurements, and the Type Ia supernovae (SN) observation (Pantheon compilation). We find that the SKA mock data could break the degeneracy between the matter density and the Hubble constant, further improving the cosmological constraints to a great extent. We also find that the constraint on the equation of state parameters of dark energy could be significantly improved by including the SKA mock data into the cosmological global fit.

    ↳ astro-ph.COgr-qchep-phPLB(2019)·22 citations
26. 26*

    Baryogenesis in the paradigm of quintessential inflation

    Safia Ahmad🇮🇳 · Antonio De Felice🇯🇵 · Nur Jaman🇮🇳 · Sachiko Kuroyanagi🇯🇵 · M. Sami🇮🇳

    We explore the possibility of baryogenesis in the framework of quintessential inflation. We focus on the model independent features of the underlying paradigm and demonstrate that the required baryon asymmetry can successfully be generated in this scenario. To this effect, we use the effective field theory framework with desired terms in the Lagrangian necessary to mimic baryon number violation \textità la} spontaneous baryogenesis which can successfully evade Sakharov's requirement allowing us to generate the observed baryon asymmetry in the equilibrium process. Our estimates are independent of the underlying physical process responsible for baryon number violation. The underlying framework of quintessential inflation essentially includes the presence of kinetic regime after inflation which gives rise to blue spectrum of gravitational wave background at high frequencies. In addition to baryogenesis, we discuss the prospects of detection of relic gravitational wave background, in the future proposed missions, sticking to model independent treatment.

    ↳ gr-qchep-phhep-thPRD(2019)·29 citations
27. 27*

    Eigenvectors from eigenvalues: A survey of a basic identity in linear algebra

    Peter B. Denton🇺🇸 · Stephen J. Parke🇺🇸 · Terence Tao🇺🇸 · Xining Zhang🇺🇸

    If $A$ is an $n\times n$ Hermitian matrix with eigenvalues ${\lambda }_1(A),\dots ,{\lambda }_n(A)$ and $i,j=1,\dots ,n$, then the $j^{\mathrm{th}}$ component $v_{i,j}$ of a unit eigenvector $v_i$ associated to the eigenvalue ${\lambda }_i(A)$ is related to the eigenvalues ${\lambda }_1(M_j),\dots ,{\lambda }_{n-1}(M_j)$ of the minor $M_j$ of $A$ formed by removing the $j^{\mathrm{th}}$ row and column by the formula $$|v_{i,j}{|}^2\prod _{k=1;k\ne i}^n\left({\lambda }_i(A)-{\lambda }_k(A)\right)=\prod _{k=1}^{n-1}\left({\lambda }_i(A)-{\lambda }_k(M_j)\right).$$ We refer to this identity as the \emph{eigenvector-eigenvalue identity} and show how this identity can also be used to extract the relative phases between the components of any given eigenvector. Despite the simple nature of this identity and the extremely mature state of development of linear algebra, this identity was not widely known until very recently. In this survey we describe the many times that this identity, or variants thereof, have been discovered and rediscovered in the literature (with the earliest precursor we know of appearing in 1834). We also provide a number of proofs and generalizations of the identity.

    ↳ math.RAhep-phhep-thmath-ph+1Bull.Am.Math.Soc.(2022)·77 citations
28. 28*

    The inflationary mechanism in Asymptotically Safe Gravity

    Alessia Platania🇩🇪

    According to the asymptotic safety conjecture, gravity is a renormalizable quantum field theory whose continuum limit is defined by an interacting fixed point of the renormalization group flow. In these proceedings we review some implications of the existence of this non-trivial fixed point in cosmological contexts. Specifically, we discuss a toy model exemplifying how the departure from the fixed-point regime can explain the approximate scale-invariance of the power spectrum of temperature fluctuations in the cosmic microwave background.

    ↳ gr-qchep-phhep-thUniverse(2019)·31 citations
29. 29*

    Primordial black holes from sound speed resonance in the inflaton-curvaton mixed scenario

    Chao Chen🇨🇳 · Yi-Fu Cai🇨🇳

    We study sound speed resonance (SSR) mechanism for primordial black hole (PBH) formation in an early universe scenario with inflaton and curvaton being mixed. In this scenario, the total primordial density perturbations can be contributed by the fluctuations from both the inflaton and curvaton fields, in which the inflaton fluctuations lead to the standard adiabatic perturbations, while the sound speed of the curvaton fluctuations are assumed to be oscillating during inflation. Due to the narrow resonance effect of SSR mechanism, we acquire the enhanced primordial density perturbations on small scales and it remains nearly scale-invariant on large scales, which is essential for PBH formation. Finally, we find that the PBHs with specific mass spectrum can be produced with a sufficient abundance for dark matter in the mixed scenario.

    ↳ astro-ph.COgr-qchep-phhep-thJCAP(2019)·114 citations
30. 30*

    Thermodynamics of scalar field models with kinetic corrections

    Binod Chetry🇮🇳 · Jibitesh Dutta🇮🇳 · Wompherdeiki Khyllep🇮🇳

    In the present work, we compare the thermodynamical viability of two types of non-canonical scalar field models with kinetic corrections: the square kinetic and square root kinetic corrections. In modern cosmology, the generalised second law of thermodynamics (GSLT) plays an important role in deciding thermodynamical compliance of a model as one cannot consider a model to be viable if it fails to respect GSLT. Hence, for comparing thermodynamical viability, we examine the validity of GSLT for these two models. For this purpose, by employing the Unified first law (UFL), we calculate the total entropy of these two models in apparent and event horizons. The validity of GSLT is then examined from the autonomous systems as the original expressions of total entropy are very complicated. Although, at the background level, both models give interesting cosmological dynamics, however, thermodynamically we found that the square kinetic correction is more realistic as compared to the square root kinetic correction. More precisely, the GSLT holds for the square kinetic correction throughout the evolutionary history except only during the radiation epoch where the scalar field may not represent a true description of the matter content. On the other hand, the square root kinetic model fails to satisfy the GSLT in major cosmological eras.

    ↳ gr-qchep-phInt.J.Mod.Phys.D(2019)·3 citations
31. 31*

    Relativistic many body theory of the electric dipole moment of ${}^{129}$Xe and its implications for probing new physics beyond the Standard Model

    Akitada Sakurai🇯🇵 · B. K. Sahoo🇮🇳 · K. Asahi🇯🇵 · B. P. Das🇯🇵

    We report the results of our theoretical studies of the time-reversal and parity violating electric dipole moment (EDM) of ${}^{129}$Xe arising from the nuclear Schiff moment (NSM) and the electron-nucleus tensor-pseudotensor (T-PT) interaction based on the self-consistent and the normal relativistic coupled-cluster methods. The important many-body effects are highlighted and their contributions are explicitly presented. The uncertainties in the calculations of the correlation and relativistic effects are determined by estimating the contributions of the triples excitations, and the Breit interaction respectively, which together amount to about 0.7% for the NSM and 0.2% for the T-PT interactions. The results of our present work in combination with improved experimental limits for ${}^{129}$Xe EDM in the future would tighten the constraints on the hadronic CP violating quantities, and this could provide important insights into new physics beyond the Standard Model of elementary particles.

    ↳ physics.atom-phhep-phnucl-thPRA(2019)·13 citations
32. 32*

    The arrow of causality and quantum gravity

    John F. Donoghue🇺🇸 · Gabriel Menezes🇧🇷

    Causality in quantum field theory is defined by the vanishing of field commutators for space-like separations. However, this does not imply a direction for causal effects. Hidden in our conventions for quantization is a connection to the definition of an arrow of causality, i.e. what is the past and what is the future. If we mix quantization conventions within the same theory, we get a violation of microcausality. In such a theory with mixed conventions the dominant definition of the arrow of causality is determined by the stable states. In some quantum gravity theories, such as quadratic gravity and possibly asymptotic safety, such a mixed causality condition occurs. We discuss some of the implications.

    ↳ hep-thgr-qchep-phPRL(2019)·83 citations
33. 33*

    Accelerating lattice quantum field theory calculations via interpolator optimization using NISQ-era quantum computing

    A. Avkhadiev🇺🇸 · P. E. Shanahan🇺🇸 · R. D. Young🇦🇺

    The only known way to study quantum field theories in non-perturbative regimes is using numerical calculations regulated on discrete space-time lattices. Such computations, however, are often faced with exponential signal-to-noise challenges that render key physics studies untenable even with next generation classical computing. Here, a method is presented by which the output of small-scale quantum computations on Noisy Intermediate-Scale Quantum era hardware can be used to accelerate larger-scale classical field theory calculations through the construction of optimized interpolating operators. The method is implemented and studied in the context of the 1+1-dimensional Schwinger model, a simple field theory which shares key features with the standard model of nuclear and particle physics.

    ↳ hep-lathep-phnucl-thPRL(2020)·41 citations
34. 34*

    How does a collapsing star look?

    Hirotaka Yoshino🇯🇵 · Kazuma Takahashi🇯🇵 · Ken-ichi Nakao🇯🇵

    Time evolution of an optical image of a pressureless star under gravitational collapse is studied in the geometric optics approximation. The star surface is assumed to emit radiation obeying Lambert's cosine law but with an arbitrary spectral intensity in the comoving frame. We develop a formalism for predicting observable quantities by photon counting and by radiometry, in particular, spectral photon flux and spectral radiant flux. Then, this method is applied to the two cases: One is monochromatic radiation, and the other is blackbody radiation. The two kinds of spectral flux are calculated numerically for each case. It is reconfirmed that the redshift factor remains finite and the star becomes gradually invisible due to decay of the photon flux. We also develop an approximate method to present analytic formulas that describe the late time behavior. A possible connection of our study to observation of high-energy neutrinos is briefly discussed.

    ↳ gr-qcastro-ph.GAhep-phPRD(2019)·19 citations
35. 35*

    Interacting dark energy in the early 2020s: a promising solution to the $H_0$ and cosmic shear tensions

    Eleonora Di Valentino🇬🇧 · Alessandro Melchiorri🇮🇹 · Olga Mena🇪🇸 · Sunny Vagnozzi🇬🇧

    We examine interactions between dark matter and dark energy in light of the latest cosmological observations, focusing on a specific model with coupling proportional to the dark energy density. Our data includes Cosmic Microwave Background (CMB) measurements from the Planck 2018 legacy data release, late-time measurements of the expansion history from Baryon Acoustic Oscillations (BAO) and Supernovae Type Ia (SNeIa), galaxy clustering and cosmic shear measurements from the Dark Energy Survey Year 1 results, and the 2019 local distance ladder measurement of the Hubble constant $H_0$ from the Hubble Space Telescope. Considering Planck data both in combination with BAO or SNeIa data reduces the $H_0$ tension to a level which could possibly be compatible with a statistical fluctuation. The very same model also significantly reduces the ${\Omega }_{\mathrm{m}}-{\sigma }_8$ tension between CMB and cosmic shear measurements. Interactions between the dark sectors of our Universe remain therefore a promising joint solution to these persisting cosmological tensions.

    ↳ astro-ph.COgr-qchep-phPhys.Dark Univ.(2020)·517 citations
36. 36*

    Integration-by-parts reductions of Feynman integrals using Singular and GPI-Space

    Dominik Bendle🇩🇪 · Janko Boehm🇩🇪 · Wolfram Decker🇩🇪 · Alessandro Georgoudis🇸🇪 · Franz-Josef Pfreundt🇩🇪 · Mirko Rahn🇩🇪 · Pascal Wasser🇩🇪 · Yang Zhang🇨🇳

    We introduce an algebro-geometrically motived integration-by-parts (IBP) reduction method for multi-loop and multi-scale Feynman integrals, using a framework for massively parallel computations in computer algebra. This framework combines the computer algebra system Singular with the workflow management system GPI-Space, which is being developed at the Fraunhofer Institute for Industrial Mathematics (ITWM). In our approach, the IBP relations are first trimmed by modern algebraic geometry tools and then solved by sparse linear algebra and our new interpolation methods. These steps are efficiently automatized and automatically parallelized by modeling the algorithm in GPI-Space using the language of Petri-nets. We demonstrate the potential of our method at the nontrivial example of reducing two-loop five-point nonplanar double-pentagon integrals. We also use GPI-Space to convert the basis of IBP reductions, and discuss the possible simplification of IBP coefficients in a uniformly transcendental basis.

    ↳ hep-thhep-phmath.AGJHEP(2020)·75 citations
37. 37*

    A Fluctuation Theory of Topological Susceptibility

    Bhupendra Nath Tiwari🇮🇹

    We investigate the long-range statistical correlations, whereby discuss the nature of the undermining interacting/ noninteracting domains and associated phase transitions under variations of the quark mass and the mass scale that corresponds to renormalized pion masses and the dimensions of an ensemble of slab sub-volumes of an arbitrary simulated lattice. The purpose of this paper is to compute the system's stability and its phase structures when it's model parameters vary infinitesimally. In particular, we focus on the stability properties and phases of an arbitrary (2+1) flavor QCD configuration under fluctuations of its parameters. In order to investigate the nature of statistical and systematic errors, and the presence of noises in the system, we explore fluctuation theory equivalences of the slab sub-volume method of computing the topological susceptibility with its low energy ChPT counterpart. Hereby, we find that the ChPT configurations always correspond to a non-interacting statistical basis in the space of the quark mass and the mass scale that corresponds to renormalized pion masses. The second system as an ensemble of finite slab sub-volumes of a simulated lattice turns out to be generically interacting under fluctuations of the slab dimensions. However, it yields an ill-defined degenerate system in the infinitesimal limit of slab parameters. It is worth mentioning that implications of the intrinsic geometric analysis are well suited towards the modeling based understanding of the gluonic topological charge density fluctuations, quark mass dependence and long auto-correlation of the global topology. Finally, we discuss the stability properties of sub-volume simulated lattice improvements towards the understanding of QCD vacua, the behavior of UV divergences, finite-volume effects, statistical precision, simultaneous measurements, and associated quantum channel measurements.

    ↳ hep-lathep-phhep-th0 citations
38. 38*

    Chern-Simons-Higgs Model as a Theory of Protein Molecules

    Dmitry Melnikov🇧🇷 · Alyson B. F. Neves

    In this paper we discuss a one-dimensional Abelian Higgs model with Chern-Simons interaction as an effective theory of one-dimensional curves embedded in three-dimensional space. We demonstrate how this effective model is compatible with the geometry of protein molecules. Using standard field theory techniques we analyze phenomenologically interesting static configurations of the model and discuss their stability. This simple model predicts some characteristic relations for the geometry of secondary structure motifs of proteins, and we show how this is consistent with the experimental data. After using the data to universally fix basic local geometric parameters, such as the curvature and torsion of the helical motifs, we are left with a single free parameter. We explain how this parameter controls the abundance and shape of the principal motifs (alpha helices, beta strands and loops connecting them).

    ↳ cond-mat.softhep-phhep-thq-bio.BMJ.Appl.Phys.(2019)·2 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.