Tue·Jan 5, 2021Tuesday·January 5, 2021

1. 01*

   On the evaluation of two-loop electroweak box diagrams for $e^{+}{e}^{-}\to HZ$ production

   Qian Song🇺🇸 · Ayres Freitas🇺🇸

   Precision studies of the Higgs boson at future $e^{+}{e}^{-}$ colliders can help to shed light on fundamental questions related to electroweak symmetry breaking, baryogenesis, the hierarchy problem, and dark matter. The main production process, $e^{+}{e}^{-}\to HZ$, will need to be controlled with sub-percent precision, which requires the inclusion of next-to-next-to-leading order (NNLO) electroweak corrections. The most challenging class of diagrams are planar and non-planar double-box topologies with multiple massive propagators in the loops. This article proposes a technique for computing these diagrams numerically, by transforming one of the sub-loops through the use of Feynman parameters and a dispersion relation, while standard one-loop formulae can be used for the other sub-loop. This approach can be extended to deal with tensor integrals. The resulting numerical integrals can be evaluated in minutes on a single CPU core, to achieve about 0.1% relative precision.

   hep-phJHEP(2021)·27 citations
2. 02*

   Study on the applicability of Varshni potential to predict the mass-spectra of the quark-antiquark systems in a non-relativistic framework

   Etido P. Inyang🇳🇬 · Ephraim P. Inyang · Eddy S. William🇳🇬 · Etebong E. Ibekwe🇳🇬

   In this work, we obtain the Schrödinger equation solutions for the Varshni potential using the Nikiforov-Uvarov method. The energy eigenvalues are obtained in non-relativistic regime. The corresponding eigenfunction is obtained in terms of Laguerre polynomials. We applied the present results to calculate heavy-meson masses of charmonium and bottomonium .The mass spectra for charmonium and bottomonium multiplets have predicted numerically. The results are in good agreement with experimental data and the work of other researchers.

   hep-phquant-ph3 citations
3. 03*

   Density profile of multi-state fuzzy dark matter

   Lauren Street🇺🇸 · Peter Suranyi🇺🇸 · L.C.R. Wijewardhana🇺🇸

   Equations of motion for excited states of weakly self-interacting bosons forming fuzzy dark matter are solved using the WKB approximation. The contribution of self-interactions are neglected in the equations of motion. Wave functions of excited states are expressed in terms of a yet undetermined gravitational potential. At equilibrium, the contributions of states to the density distribution are summed using Bose-Einstein statistics. Combined with the Poisson equation, a differential equation is obtained for the gravitational potential, which has physically acceptable solutions only if the energy spectrum of excited states has a finite gap, corresponding to a finite virial radius. Such a gap could be created by decay processes, in first order perturbation of the self-interaction potential. The obtained density profile is found to be similar to the Burkert profile.

   hep-phastro-ph.COastro-ph.GA5 citations
4. 04*

   Convergent Bayesian Global Fits of 4D Composite Higgs Models

   Ethan Carragher🇦🇺 · Will Handley🇬🇧 · Daniel Murnane🇺🇸 · Peter Stangl🇨🇭 · Wei Su🇦🇺 · Martin White🇦🇺 · Anthony G. Williams🇦🇺

   Models in which the Higgs boson is a composite pseudo-Nambu-Goldstone boson offer attractive solutions to the Higgs mass naturalness problem. We consider three such models based on the minimal $SO(5)\to SO(4)$ symmetry breaking pattern, and perform convergent global fits on the models under a Bayesian framework in order to find the regions of their parameter spaces that best fit a wide range of constraints, including recent Higgs measurements. We use a novel technique to analyse the fine-tuning of the models, quantifying the tuning as the Kullback-Leibler divergence from the prior to the posterior probability on the parameter space. Each model is found to be able to satisfy all constraints at the $3\sigma$ level simultaneously. As a by-product of the fits, we analyse the collider phenomenology of our models in these viable regions. In two of the three models, we find that the $gg\to H\to \gamma \gamma$ cross section is less than $\sim 90$% that predicted by the SM, which is already in slight tension with experiment and could potentially be ruled out in the future high-luminosity run of the LHC. In addition, the lightest fermions $F$ arising from the new strong dynamics in these models are seen in general to lie above $\sim 1.1$ TeV, with the $F\to t{W}^{+}$ and $F\to \bar{b}{W}^{+}$ decays offering particularly promising channels for probing these models in future collider searches.

   hep-phJHEP(2021)·7 citations
5. 05*

   Strangeness production in high-multiplicity events

   Marat Siddikov🇨🇱 · Iván Schmidt🇨🇱

   In this paper we analyze in detail the production of strangeness in proton-proton collisions in the kinematics of large transverse momenta $p_T$ of produced hadrons. Using the color dipole framework, we estimated the production cross-sections for kaons, and demonstrated that the shapes of the $p_T$-dependence are in agreement with available experimental data. We also analyzed the self-normalized yields of strange hadrons as a function of multiplicity of co-produced hadrons, and found that the predictions are in agreement with the faster-than-linear growth seen in experimental data. Our description is largely parameter-free and complements our previous studies dedicated to the explanation of multiplicity enhancement of quarkonia, as well as $D$- and $B$-mesons.

   hep-phPRD(2021)·5 citations
6. 06*

   Axion-Like Particles at the ILC Giga-Z

   Noah Steinberg🇺🇸 · James D. Wells🇺🇸

   Axion-Like Particles (ALPs) are a generic, calculable, and well motivated extension of the Standard Model with far reaching phenomenology. ALPs that couple only to hypercharge represent one subset of such models, coupling the ALP to both photons and the $Z$ boson. We examine the current constraints on this class of models with an ALP mass in the 100 MeV to 100 GeV range, paying particular attention to the region between 100 MeV to 10 GeV, a portion of parameter space which is ill constrained by current experiments. We show that the more than $10^9$ $Z$ bosons produced in the Giga-Z mode of the future ILC experiment, combined with the highly granular nature of its detectors, will allow for ALPs coupled to hypercharge to be discovered with couplings down to nearly $10^{-5}\mathrm{Ge}{\mathrm{V}}^{-1}$ over a range of masses from 0.4 to 50 GeV.

   hep-phhep-exJHEP(2021)·15 citations
7. 07*

   Study of the ${\rm Y}(1S)$ $\to$ $DP$ decays

   Yueling Yang🇨🇳 · Mingfei Duan🇨🇳 · Junliang Lu🇨🇳 · Jinshu Huang🇨🇳 · Junfeng Sun🇨🇳

   Inspired by the potential prospects of high-luminosity dedicated colliders and the high enthusiasms in searching for new physics in the flavor sector at the intensity frontier, the ${\rm Y}(1S)$ $\to$ $D^{-}{\pi }^{+}$, ${\overline{D}}^0{\pi }^0$ and $D_s^{-}{K}^{+}$ weak decays are studied with the perturbative QCD approach. It is found within the standard model that the branching ratios for the concerned processes are tiny, about $\mathcal{O}(10^{-18})$, and far beyond the detective ability of current experiments unless there exists some significant enhancements from a noval interaction.

   hep-phInt.J.Mod.Phys.A(2021)·1 citation
8. 08*

   Spin Polarization Induced by Inhomogeneous Dynamical Condensate

   Ziyue Wang🇨🇳 · Pengfei Zhuang🇨🇳

   The role of dynamical chiral condensate in spin polarization is investigated in a kinetic theory framework. Transport equations for quark matter are derived in the mean-field approximation for the Nambu--Jona-Lasinio model. The dynamical condensate carries part of the energy momentum tensor (EMT) and the angular momentum tensor (AMT), the conservation of EMT and AMT can be proved from the kinetic equations as required by the symmetry. The transport equations of vector and axial-vector components are derived taking the spin decomposition as well as semi-classical expansion. Inhomogeneous mass introduces novel effect at $\mathcal{O}(\hslash )$, for an initially unpolarized system, spin polarization can be generated from the dynamical chiral condensate, even without the collision term. The stable spin distribution function is found to be robust, namely in the case with non-trivial dynamical mass, the spin polarization is still enslaved by the thermal vorticity, while the Killing condition can be loosened.

   hep-ph10 citations
9. 09*

   The Contribution of Charged Bosons with Right-Handed Neutrinos to the Muon g-2 Anomaly in the Twin Higgs Models

   Guo-Li Liu🇨🇳 · Ping Zhou🇨🇳

   We examine the charged boson and right-handed neutrino contribution to the muon g-2 anomaly in the twin Higgs models with the joint constraints of the Higgs global fit data, the precision electroweak data, the leptonic flavor changing decay \mu \to e\gamma, and the mass requirement of the heavy gauge bosons. It comes out with the conclusion that some parameters such as the coupling of charged Higgs to the lepton y_\mu, the top Yukawa y_t, and the heavy gauge boson coupling to the lepton V_\mu are constrained roughly in the range of 0.12\lesssim y_\mu\lesssim 0.4, 0.4\lesssim y_t\lesssim 0.9, and 0.47\lesssim V_\mu\lesssim 1, respectively.

   hep-phUniverse(2022)·5 citations
10. 10*

    Freeze-in self-interacting dark matter in warped extra dimension

    Shao-Ping Li🇨🇳 · Xin Zhang🇨🇳

    A classically scale-invariant scalar singlet can be a MeV-scale dark matter, with a feeble Higgs portal coupling at $\mathcal{O}(10^{-10})$. Besides, an $\mathcal{O}(0.1)$ self-interaction coupling could further serve to alleviate the small-scale problems in the Universe. We show that, such a dark matter candidate can naturally arise in the warped extra dimension, with the huge span of parameter space predicted well within $\mathcal{O}(1)$ fundamental parameters.

    hep-phPLB(2021)·3 citations
11. 11*

    Kinematic corrections and reconstruction methods for neutral Higgs boson decay to $b\bar{b}$ in 2HDM type-I at future lepton colliders

    Majid Hashemi🇮🇷 · Elnaz Ebrahimi🇮🇷

    In this paper, an approach for neutral Higgs bosons search is described based on 2HDM type-I at electron-positron linear colliders operating at $\sqrt{s}=1$ TeV. The beam is assumed to be unpolarized and fast detector simulation is included. The signal process produces a fully hadronic final state through $e^{+}{e}^{-}\to AH\to b\bar{b}b\bar{b}$ where both CP-even and CP-odd Higgs bosons ($H$ and $A$) are assumed to decay to a pair of $b$-jets. Several benchmark scenarios are introduced as the baseline for the analysis taking $m_{H/A}$ in the range 150--300 GeV. In order to avoid Higgs boson conversion $A\to ZH$, Higgs boson masses are chosen with $m_A-m_H<m_Z$. It is shown that with a proper kinematic correction applied on final state $b$-jet four momenta, true combinations of $b$-jets can be found for simultaneous reconstruction of both Higgs bosons through $b\bar{b}$ invariant mass calculation. Results show that observable signals can be achieved with statistical significance exceeding $5\sigma$ well before the target integrated luminosity of 8 $a{b}^{-1}$.

    hep-phPRD(2021)·4 citations
12. 12*

    On the correlation coefficient T(E_e) of the neutron beta decay, caused by the correlation structure invariant under discrete P, C and T symmetries

    A. N. Ivanov🇦🇹 · R. Höllwieser🇩🇪 · N. I. Troitskaya🇦🇹 · M. Wellenzohn🇦🇹 · Ya. A. Berdnikov🇷🇺

    We analyze the correlation coefficient T(E_e), which was introduced by Ebel and Feldman (Nucl. Phys. 4, 213 (1957)). The correlation coefficient T(E_e) is induced by the correlations of the neutron spin with the antineutrino 3-momentum and the electron spin with the electron 3-momentum. Such a correlation structure is invariant under discrete P, C and T symmetries. The correlation coefficient T(E_e), calculated to leading order in the large nucleon mass m_N expansion, is equal to T(E_e) = - 2 g_A(1 + g_A)/(1 + 3 g^2_A) = - B_0, i.e. of order |T(E_e)| ~ 1, where $g_A$ is the axial coupling constant. Within the Standard Model (SM) we describe the correlation coefficient $T(E_e)$ at the level of 10^{-3} by taking into the radiative corrections of order O(\alpha/\pi) or the outer model-independent radiative corrections, where \alpha is the fine-structure constant, and the corrections of order O(E_e/m_N), caused by weak magnetism and proton recoil. We calculate also the contributions of interactions beyond the SM, including the contributions of the second class currents.

    hep-phnucl-exPLB(2021)·4 citations
13. 13*

    A survey of heavy-antiheavy hadronic molecules

    Xiang-Kun Dong🇨🇳 · Feng-Kun Guo🇨🇳 · Bing-Song Zou🇨🇳

    Many efforts have been made to reveal the nature of the overabundant resonant structures observed by the worldwide experiments in the last two decades. Hadronic molecules attract special attention because many of these seemingly unconventional resonances are located close to the threshold of a pair of hadrons. To give an overall feature of the spectrum of hadronic molecules composed of a pair of heavy-antiheavy hadrons, namely, which pairs are possible to form molecular states, we take charmed hadrons for example to investigate the interaction between them and search for poles by solving the Bethe-Salpeter equation. We consider all possible combinations of hadron pairs of the $S$-wave singly-charmed mesons and baryons as well as the narrow $P$-wave charmed mesons. The interactions, which are assumed to be meson-exchange saturated, are described by constant contact terms which are resummed to generate poles. It turns out that if a system is attractive near threshold by the light meson exchange, there is a pole close to threshold corresponding to a bound state or a virtual state, depending on the strength of interaction and the cutoff. In total, 229 molecular states are predicted. The observed near-threshold structures with hidden-charm, like the famous $X(3872)$ and $P_c$ states, fit into the spectrum we obtain. We also highlight a ${\Lambda }_c{\bar{\Lambda }}_c$ bound state that has a pole consistent with the cross section of the $e^{+}{e}^{-}\to {\Lambda }_c{\bar{\Lambda }}_c$ precisely measured by the BESIII Collaboration.

    hep-phhep-exhep-latnucl-thProgr.Phys.(2021)·240 citations
14. 14*

    Medium modified Fragmentation Functions with open source xFitter

    Pía Zurita🇩🇪

    A new analysis of the modification of the hadronization process in the nuclear medium for pions is presented. The effective description is condensed in a set of medium modified fragmentation functions (nFFs) obtained at next-to-leading order (NLO) accuracy. The study was made using the open-source tool xFitter, conveniently modified to incorporate semi-inclusive processes. Theoretical uncertainties for the nFFs are also provided.

    hep-ph16 citations
15. 15*

    The trace amplitude method and its application to the NLO QCD calculation

    Zi-Qiang Chen🇨🇳 · Cong-Feng Qiao🇨🇳

    The trace amplitude method (TAM) provides us a straightforward way to calculate the helicity amplitudes with massive fermions analytically. In this work, we review the basic idea of this method, and then discuss how it can be applied to next-to-leading order (NLO) quantum chromodynamics (QCD) calculations, which has not been explored before. By analyzing the singularity structures of both virtual and real corrections, we show that the TAM can be generalized to NLO QCD calculations straightforwardly, the only caution is that the unitarity should be guaranteed. We also present a simple example to demonstrate the application of this method.

    hep-ph1 citation
16. 16*

    Maximum entropy kinetic matching conditions for heavy-ion collisions

    Derek Everett🇺🇸 · Chandrodoy Chattopadhyay🇺🇸 · Ulrich Heinz🇺🇸

    Coupling hadronic kinetic theory models to fluid dynamics in phenomenological studies of heavy ion collisions requires a prescription for ``particlization''. Existing particlization models are based on implicit or explicit assumptions about the microscopic degrees of freedom that go beyond the information provided by the preceding fluid dynamical history. We propose an alternative prescription which uses only macroscopic information provided by the hydrodynamic output. This method follows directly from the connections between information theory and statistical mechanics.

    hep-phnucl-thPRC(2021)·24 citations
17. 17*

    Analytical solutions of the Schrödinger equation with Kratzer-screened Coulomb potential to the Quarkonium systems

    Etido P. Inyang🇳🇬 · Ephraim P. Inyang · Joseph E. Ntibi🇳🇬 · Eddy S. William🇳🇬

    In this work, we obtain the Schrödinger equation solutions for the Kratzer potential plus screened Coulomb potential model using the series expansion method. The energy eigenvalues is obtained in non-relativistic regime and the corresponding unnormalized eigenfunction. Three special cases were obtained. We applied the present results to calculate heavy-meson masses of charmonium and bottomonium , and we got the numerical values for 1S, 2S, 1P,2P, 3S, 4S ,1D,2D and 1F states. The results are in good agreement with experimental data and the work of other researchers.

    hep-phquant-ph3 citations
18. 18*

    Approximate solutions of the Schrodinger equation with Hulthen-Hellmann Potentials for a Quarkonium system

    I. O. Akpan · E. P. Inyang · E. P. Inyang · E. S. William

    Hulthén plus Hellmann potentials are adopted as the quark-antiquark interaction potential for studying the mass spectra of heavy mesons. We solved the radial Schrödinger equation analytically using the Nikiforov-Uvarov method. The energy eigenvalues and corresponding wave function in terms of Laguerre polynomials were obtained. The present results are applied for calculating the mass of heavy mesons such as charmonium and bottomonium . Four special cases were considered when some of the potential parameters were set to zero, resulting into Hellmann potential, Yukawa potential, Coulomb potential, and Hulthén potential, respectively. The present potential provides satisfying results in comparison with experimental data and the work of other researchers.

    hep-phquant-phRev.Mex.Fis.(2021)·18 citations
19. 19*

    Positivity in Multi-Field EFTs

    Xu Li🇨🇳 · Hao Xu🇨🇳 · Chengjie Yang🇨🇳 · Cen Zhang🇨🇳 · Shuang-Yong Zhou🇨🇳

    We discuss the general method for obtaining full positivity bounds on multi-field effective field theories (EFTs). While the leading order forward positivity bounds are commonly derived from the elastic scattering of two (superposed) external states, we show that for a generic EFT containing 3 or more low-energy modes, this approach only gives incomplete bounds. We then identify the allowed parameter space as the dual to a spectrahedron, constructed from crossing symmetries of the amplitude, and show that finding the optimal bounds for a given number of modes is equivalent to a geometric problem: finding the extremal rays of a spectrahedron. We show how this is done analytically for simple cases, and numerically formulated as semidefinite programming (SDP) problems for more complicated cases. We demonstrate this approach with a number of well-motivated examples in particle physics and cosmology, including EFTs of scalars, vectors, fermions and gravitons. In all these cases, we find that the SDP approach leads to results that either improve the previous ones or are completely new. We also find that the SDP approach is numerically much more efficient.

    hep-phhep-thPRL(2021)·86 citations
20. 20*

    Degenerate Horava gravity

    Enrico Barausse🇮🇹 · Marco Crisostomi🇮🇹 · Stefano Liberati🇮🇹 · Lotte ter Haar🇮🇹

    Horava gravity breaks Lorentz symmetry by introducing a dynamical timelike scalar field (the khronon), which can be used as a preferred time coordinate (thus selecting a preferred space-time foliation). Adopting the khronon as the time coordinate, the theory is invariant only under time reparametrizations and spatial diffeomorphisms. In the infrared limit, this theory is sometimes referred to as khronometric theory. Here, we explicitly construct a generalization of khronometric theory, which avoids the propagation of Ostrogradski modes as a result of a suitable degeneracy condition (although stability of the latter under radiative corrections remains an open question). While this new theory does not have a general-relativistic limit and does not yield a Friedmann-Robertson-Walker-like cosmology on large scales, it still passes, for suitable choices of its coupling constants, local tests on Earth and in the solar system, as well as gravitational-wave tests. We also comment on the possible usefulness of this theory as a toy model of quantum gravity, as it could be completed in the ultraviolet into a 'degenerate Horava gravity' theory that could be perturbatively renormalizable without imposing any projectability condition.

    ↳ hep-thgr-qchep-phClass.Quant.Grav.(2021)·3 citations
21. 21*

    P-wave nucleon-pion scattering amplitude in the $\Delta (1232)$ channel from lattice QCD

    Giorgio Silvi🇩🇪 · Srijit Paul🇩🇪 · Constantia Alexandrou🇨🇾 · Stefan Krieg🇩🇪 · Luka Leskovec🇺🇸 · Stefan Meinel🇺🇸 · John Negele🇺🇸 · Marcus Petschlies🇩🇪 · Andrew Pochinsky🇺🇸 · Gumaro Rendon🇺🇸 · Sergey Syritsyn🇺🇸 · Antonino Todaro🇨🇾

    We determine the $\Delta (1232)$ resonance parameters using lattice QCD and the Lüscher method. The resonance occurs in elastic pion-nucleon scattering with $J^P=3/2^{+}$ in the isospin $I=3/2$, $P$-wave channel. Our calculation is performed with $N_f=2+1$ flavors of clover fermions on a lattice with $L\approx 2.8$ fm. The pion and nucleon masses are $m_{\pi }=255.4(1.6)$ MeV and $m_N=1073(5)$ MeV, and the strong decay channel $\Delta \to \pi N$ is found to be above the threshold. To thoroughly map out the energy-dependence of the nucleon-pion scattering amplitude, we compute the spectra in all relevant irreducible representations of the lattice symmetry groups for total momenta up to $\vec{P}=\frac{2\pi }{L}(1,1,1)$, including irreps that mix $S$ and $P$ waves. We perform global fits of the amplitude parameters to up to 21 energy levels, using a Breit-Wigner model for the $P$-wave phase shift and the effective-range expansion for the $S$-wave phase shift. From the location of the pole in the $P$-wave scattering amplitude, we obtain the resonance mass $m_{\Delta }=1378(7)(9)$ MeV and the coupling $g_{\Delta \text{-}\pi N}=23.8(2.7)(0.9)$.

    ↳ hep-lathep-phnucl-thPRD(2021)·46 citations
22. 22*

    Importance of meson-meson and of diquark-antidiquark creation operators for a $\bar{b}\bar{b}ud$ tetraquark

    Pedro Bicudo🇵🇹 · Antje Peters🇩🇪 · Sebastian Velten🇩🇪 · Marc Wagner🇩🇪

    In recent years, the existence of a hadronically stable $\bar{b}\bar{b}ud$ tetraquark with quantum numbers $I(J^P)=0(1^{+})$ was confirmed by first principles lattice QCD computations. In this work we use lattice QCD to compare two frequently discussed competing structures for this tetraquark by considering meson-meson as well as diquark-antidiquark creation operators. We use the static-light approximation, where the two $\bar{b}$ quarks are assumed to be infinitely heavy with frozen positions, while the light $u$ and $d$ quarks are fully relativistic. By minimizing effective energies and by solving generalized eigenvalue problems we determine the importance of the meson-meson and the diquark-antidiquark creation operators with respect to the ground state. It turns out, that the diquark-antidiquark structure dominates for $\bar{b}\bar{b}$ separations $r<0.25\text{fm}$, whereas it becomes increasingly more irrelevant for larger separations, where the $I(J^P)=0(1^{+})$ tetraquark is mostly a meson-meson state. We also estimate the meson-meson to diquark-antidiquark ratio of this tetraquark and find around $60\%/40\%$.

    ↳ hep-lathep-phPRD(2021)·38 citations
23. 23*

    Tachyon Mimetic Inflation as an Instabilities-Free Model

    Narges Rashidi🇮🇷 · Kourosh Nozari🇮🇷

    We consider the mimetic tachyon model in the Lagrange multiplier approach. We study both the linear and non-linear perturbations and find the perturbation and non-gaussianity parameters in this setup. By adopting two types of the scale factor as the power-law ($a=a_0{t}^n$) and intermediate ($a=a_0\exp (b{t}^{\beta })$) scale factors, we perform a numerical analysis on the model which is based on Planck2018 TT, TE, EE+lowE+lensing +BAO +BK14 and Planck2018 TTT, EEE, TTE and EET data sets. We show that the mimetic tachyon model with both the power-law and intermediate scale factors, in some ranges of its parameter space is instabilities-free and observationally viable. The power-law mimetic tachyon model with $26.3<n<33.0$ and the intermediate mimetic tachyon model with $0.116<\beta <0.130$ are consistent with observational data and free of the ghost and gradient instabilities.

    ↳ astro-ph.COhep-phPRD(2020)·9 citations
24. 24*

    Modular flavor symmetries of three-generation modes on magnetized toroidal orbifolds

    Shota Kikuchi🇯🇵 · Tatsuo Kobayashi🇯🇵 · Hikaru Uchida🇯🇵

    We study the modular symmetry on magnetized toroidal orbifolds with Scherk-Schwarz phases. In particular, we investigate finite modular flavor groups for three-generation modes on magnetized orbifolds. The three-generation modes can be the three-dimensional irreducible representations of covering groups and central extended groups of ${\Gamma }_N$ for $N=3,4,5,7,8,16$, that is, covering groups of $\Delta (6(N/2{)}^2)$ for $N=$ even and central extensions of $PSL(2,{\mathbb{Z}}_N)$ for $N=$odd with Scherk-Schwarz phases. We also study anomaly behaviors.

    ↳ hep-thhep-phPRD(2021)·80 citations
25. 25*

    Is asymptotically safe inflation eternal?

    Jan Chojnacki🇵🇱 · Julia Krajecka🇵🇱 · Jan H. Kwapisz🇵🇱 · Oskar Słowik🇵🇱 · Artur Strąg🇵🇱

    Recently, based on swampland considerations in string theory, the (no) eternal inflation principle has been put forward. The natural question arises whether similar conditions hold in other approaches to quantum gravity. In this article, the asymptotic safety hypothesis is considered in the context of eternal inflation. As exemplary inflationary models the SU(N) Yang-Mills in the Veneziano limit and various RG-improvements of the gravitational action are studied. The existence of UV fixed point generically flattens the potential and our findings suggest no tension between eternal inflation and asymptotic safety, both in the matter and gravitational sector in contradistinction to string theory. Moreover, the eternal inflation cannot take place in the range of applicability of effective field quantum gravity theory. We employ the analytical relations for eternal inflation to some of the models with single minima, such as Starobinsky inflation, alpha-attractors, or the RG-improved models and verify them with the massive numerical simulations. The validity of these constraints is also discussed for a multi-minima model.

    ↳ gr-qchep-phhep-thJCAP(2021)·13 citations
26. 26*

    Charged particles interaction in both a finite volume and a uniform magnetic field

    Peng Guo🇺🇸 · Vladimir Gasparian🇺🇸

    A formalism for describing charged particles interaction in both a finite volume and a uniform magnetic field is presented. In the case of short-range interaction between charged particles, we show that the factorization between short-range physics and finite volume long-range correlation effect is possible, a Lüscher formula-like quantization condition is thus obtained.

    ↳ hep-lathep-phPRD(2021)·25 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.