Thu·Apr 22, 2021Thursday·April 22, 2021

1. 01*

   The Continuum Linear Dilaton

   Eugenio Megias🇪🇸 · Mariano Quiros🇪🇸

   Continuum spectra can be a way out to alleviate the tension generated by the elusiveness of narrow resonances of new physics in direct experimental searches. Motivated by the latter, we consider the linear dilaton model with a continuum spectrum of KK modes. It is provided by a critical exponential bulk potential for the scalar field stabilizing the distance, between the UV boundary at $y=0$ and a naked (good) singularity at $y=y_s$, in proper coordinates, which corresponds in conformal coordinates to $z_s\to \infty$. The cutoff $M_s$ in this theory is an intermediate scale $M_s\simeq 10^{-5}{M}_{\mathrm{Pl}}$ and the warped factor solves the hierarchy between $M_s$ and the TeV, while the hierarchy between $M_{\mathrm{Pl}}$ and $M_s$ has to be solved by a (Little) String Theory with coupling $g_s\simeq 10^{-5}$. The Standard Model is localized on a 4D IR brane. The graviton and radion Green's and spectral functions have a continuum of states with a TeV mass gap, and isolated poles consisting on the 4D graviton and the light radion/dilaton. We construct the effective field theory below the mass gap where the continua of KK modes are integrated out, generating a set of dimension eight operators which contribute to low energy electroweak precision observables, and high energy violation of unitarity in vector boson scattering processes. The radion mass depends on the stabilizing UV brane potential and its wave function is localized toward the IR which enhances its coupling with the SM fields.

   hep-phhep-thActa Phys.Polon.B(2021)·23 citations
2. 02*

   Semileptonic $B_c\to {\eta }_c,J/\psi$ transitions

   Zhao-Qian Yao🇨🇳 · Daniele Binosi🇮🇹 · Zhu-Fang Cui🇨🇳 · Craig D. Roberts🇨🇳

   Using a systematic, symmetry-preserving continuum approach to the Standard Model strong-interaction bound-state problem, we deliver parameter-free predictions for all semileptonic $B_c\to {\eta }_c,J/\psi$ transition form factors on the complete domains of empirically accessible momentum transfers. Working with branching fractions calculated therefrom, the following values of the ratios for $\tau$ over $\mu$ final states are obtained: $R_{{\eta }_c}=0.313(22)$ and $R_{J/\psi }=0.242(47)$. Combined with other recent results, our analysis confirms a $2\sigma$ discrepancy between the Standard Model prediction for $R_{J/\psi }$ and the single available experimental result.

   hep-phhep-exhep-latnucl-ex+1PLB(2021)·25 citations
3. 03*

   Searches for dark photons at accelerators

   Matt Graham🇺🇸 · Christopher Hearty🇨🇦 · Mike Williams🇺🇸

   Dark matter particles may interact with other dark matter particles via a new force mediated by a dark photon, $A^{\prime }$, which would be the dark-sector analog to the ordinary photon of electromagnetism. The dark photon can obtain a highly suppressed mixing-induced coupling to the electromagnetic current, providing a portal through which dark photons can interact with ordinary matter. This review focuses on $A^{\prime }$ scenarios that are potentially accessible to accelerator-based experiments. We summarize the existing constraints placed by such experiments on dark photons, highlight what could be observed in the near future, and discuss the major experimental challenges that must be overcome to improve sensitivities.

   hep-phAnn.Rev.Nucl.Part.Sci.(2021)·116 citations
4. 04*

   Understanding $P_{cs}(4459)$ as a hadronic molecule in the ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decay

   Jun-Xu Lu🇨🇳 · Ming-Zhu Liu🇨🇳 · Rui-Xiang Shi🇨🇳 · Li-Sheng Geng🇨🇳

   Recently, the LHCb Collaboration reported on the evidence for a hidden charm pentaquark state with strangeness, i.e., $P_{cs}(4459)$, in the $J/\psi \Lambda$ invariant mass distribution of the ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decay. In this work, assuming that $P_{cs}(4459)$ is a ${\bar{D}}^{\ast }{\Xi }_c$ molecular state, we study this decay via triangle diagrams ${\Xi }_b\to {\bar{D}}_s^{(\ast )}{\Xi }_c\to ({\bar{D}}^{(\ast )}\bar{K}){\Xi }_c\to P_{cs}\bar{K}\to (J/\psi \Lambda )\bar{K}$. Our study shows that the production yield of a spin 3/2 ${\bar{D}}^{\ast }{\Xi }_c$ state is approximately one order of magnitude larger than that of a spin $1/2$ state due to the interference of ${\bar{D}}_s{\Xi }_c$ and ${\bar{D}}_s^{\ast }{\Xi }_c$ intermediate states. We obtain a model independent constraint on the product of couplings $g_{P_{cs}{\bar{D}}^{\ast }{\Xi }_c}$ and $g_{P_{cs}J/\psi \Lambda }$. With the predictions of two particular molecular models as inputs, we calculate the branching ratio of ${\Xi }_b^{-}\to (P_{cs}\to )J/\psi \Lambda K^{-}$ and compare it with the experimental measurement. We further predict the lineshape of this decay which could be useful to future experimental studies.

   hep-phPRD(2021)·49 citations
5. 05*

   Gauged Lepton Number, Dirac Neutrinos, Dark Matter, and Muon $g-2$

   Ernest Ma (UC Riverside)🇺🇸

   Lepton number is promoted to an $U(1{)}_L$ gauge symmetry in a simple extension of the standard model. The spontaneous breaking of $U(1{)}_L$ by three units allows a conserved $Z_3^L$ lepton symmetry to remain, guaranteeing that neutrinos are Dirac fermions, which acquire naturally small masses from a previously proposed mechanism. Dark matter appears as a singlet scalar, with dark symmetry $Z_3^D$ derivable from $Z_3^L$. Muon $g-2$ may be explained.

   hep-phPLB(2021)·8 citations
6. 06*

   Extracting the pole and Breit-Wigner properties of nucleon and $\Delta$ resonances from the $\gamma N\to K\Sigma$ photoproduction

   S. Clymton🇮🇩 · T. Mart🇮🇩

   We have developed a covariant isobar model to phenomenologically explain the four possible isospin channels of $K\Sigma$ photoproduction. To obtain a consistent reaction amplitude, which is free from the lower-spin background problem, we used the consistent electromagnetic and hadronic interactions described in our previous report. We used all available experimental data, including the recent MAMI A2 2018 data obtained for the $K^0{\Sigma }^{+}$ and $K^0{\Sigma }^0$ isospin channels. By fitting the calculated observables to these data we extract the resonance properties, including their Breit-Wigner and pole parameters. Comparison of the extracted parameters with those listed by the Particle Data Group yields a nice agreement. An extensive comparison of the calculated observables with experimental data is also presented. By using the model we investigated the effects of three different form factors used in the hadronic vertex of each diagram. A brief discussion on the form factors is given.

   hep-phPRD(2021)·18 citations
7. 07*

   Cosmology of Linear Higgs-Sigma Models with Conformal Invariance

   Hyun Min Lee🇰🇷 · Adriana G. Menkara🇰🇷

   We consider general linear Higgs-sigma models as ultra-violet completions of the Higgs inflation. We introduce general higher curvature terms beyond Einstein gravity and recast them into a class of linear Higgs-sigma models in the scalar-dual formulation where conformal symmetry is manifest. Integrating out the sigma field in this class of linear sigma models, we obtain the same Higgs inflation Lagrangian of non-linear sigma model type in the effective theory. We show that the successful inflation for sigma field singles out the sigma-field potential derived from the $R^2$ term and the tracker solution for dark energy at late times can be realized for the $R^{p+1}$ term with $-1<p<0$. We also discuss the implications of Higgs-sigma interactions for the inflation and the vacuum stability in the Standard Model.

   hep-phhep-thJHEP(2021)·12 citations
8. 08*

   The axion-baryon coupling in SU(3) heavy baryon chiral perturbation theory

   Thomas Vonk🇩🇪 · Feng-Kun Guo🇨🇳 · Ulf-G. Meißner🇩🇪

   In the past, the axion-nucleon coupling has been calculated in the framework of SU(2) heavy baryon chiral perturbation theory up to third order in the chiral power counting. Here, we extend these earlier studies to the case of heavy baryon chiral perturbation theory with SU(3) flavor symmetry and derive the axion coupling to the full SU(3) baryon octet, showing that the axion also significantly couples to hyperons. As studies on dense nuclear matter suggest the possible existence of hyperons in stellar objects such as neutron stars, our results should have phenomenological implications related to the so-called axion window.

   hep-phhep-lathep-thnucl-thJHEP(2021)·25 citations
9. 09*

   Multi-scalar signature of self-interacting dark matter in the NMSSM and beyond

   Jinmian Li🇨🇳 · Junle Pei🇨🇳 · Cong Zhang🇨🇳

   This work studies the self-interacting dark matter (SIDM) scenario in the general NMSSM and beyond, where the dark matter is a Majorana fermion and the force mediator is a scalar boson. An improved analytical expression for the dark matter (DM) self-interacting cross section which takes into account the Born level effects is proposed. Due to the large couplings and light mediator in SIDM scenario, the DM/mediator will go through multiple branchings if they are produced with high energy. Based on the Monte Carlo simulation of the showers in the DM sector, we obtain the multiplicities and the spectra of the DM/mediator from the Higgsino production and decay at the LHC for our benchmark points.

   hep-phJHEP(2021)·4 citations
10. 10*

    The SuSA model for neutrino oscillation experiments: from quasielastic scattering to the resonance region

    Maria B. Barbaro🇮🇹 · Arturo De Pace🇮🇹 · Luisa Fiume🇮🇹

    High precision studies of Beyond-Standard-Model physics through accelerator-based neutrino oscillation experiments require a very accurate description of neutrino-nucleus cross sections in a broad energy region, going from quasielastic scattering up to deep inelastic scattering. In this work we focus on the following processes: quasielastic scattering, two-particle-two-hole excitations, and the excitation of the first (Delta) and second (Roper) resonances of the nucleon. The nuclear model is fully relativistic and includes both one- and two-body currents. We compare our results with recent T2K and MicroBooNE data on carbon and argon targets, and present predictions for DUNE kinematics.

    hep-phhep-exnucl-exnucl-thUniverse(2021)·15 citations
11. 11*

    Nonlinear evolution of fast neutrino flavor conversion in the preshock region of core-collapse supernovae

    Masamichi Zaizen🇯🇵 · Taiki Morinaga🇯🇵

    In environments with high dense neutrino gases, such as in core-collapse supernovae, the neutrinos can experience collective neutrino oscillation due to their self-interactions. In particular, fast flavor conversion driven by the crossings in the neutrino angular distribution can affect explosion mechanism, nucleosynthesis, and neutrino observation. We perform the numerical computation of nonlinear flavor evolution on the neutrino angular distribution with tiny crossings expected to be generated in the preshock region. We demonstrate that the fast instability is triggered and a cascade develops under a realistic three-flavor model considering muon production and weak magnetism in the SN dynamics. The tiny crossing excites specific spatial modes, and then the flavor instability propagates into other modes which otherwise remain stable due to the nonlinear effects. Our results indicate that fast flavor conversion can rise in the preshock region and have a sufficient impact on the flavor contents.

    hep-phastro-ph.HEPRD(2021)·48 citations
12. 12*

    Constraining models with extra heavy gauge bosons using LHC measurements

    Mohammad Mahdi Altakach🇫🇷

    We discuss significant improvements to our calculation of electroweak (EW) $t\bar{t}$ hadroproduction in extensions of the Standard Model (SM) with extra heavy neutral and charged spin-1 resonances using the Recola2 package. We allow for flavour-non-diagonal $Z^{\prime }$ couplings and take into account non-resonant production in the SM and beyond including the contributions with t-channel $W$- and $W^{\prime }$-bosons. We include next-to-leading order (NLO) QCD corrections and consistently match to parton showers with the POWHEG method fully taking into account the interference effects between SM and new physics amplitudes. We briefly describe the Contour method and give some information about the Rivet repository which catalogues particle-level measurements subsequently used by Contur to set limits on beyond the SM (BSM) theories. We explain how we use our calculation within Contour in order to set limits on models with additional heavy gauge bosons using LHC measurements, and illustrate this with an example using the leptophobic Topcolour (TC) model.

    hep-ph1 citation
13. 13*

    ${\pi }^{-}p\to {\eta }^{(\prime )}{\pi }^{-}p$ in the double-Regge region

    JPAC Collaboration: L. Bibrzycki🇵🇱 · C. Fernandez-Ramirez🇲🇽 · V. Mathieu🇪🇸 · M. Mikhasenko🇨🇭 · M. Albaladejo🇺🇸 · A.N. Hiller Blin🇺🇸 · A. Pilloni🇮🇹 · A.P. Szczepaniak🇺🇸

    The production of ${\eta }^{(\prime )}\pi$ pairs constitutes one of the golden channels to search for hybrid exotics, with explicit gluonic degrees of freedom. Understanding the dynamics and backgrounds associated to ${\eta }^{(\prime )}\pi$ production above the resonance region is required to impose additional constraints to the resonance extraction. We consider the reaction ${\pi }^{-}p\to {\eta }^{(\prime )}{\pi }^{-}p$ measured by COMPASS. We show that the data in $2.4<m_{{\eta }^{(\prime )}\pi }<3.0$ GeV can be described by amplitudes based on double-Regge exchanges. The angular distribution of the meson pairs, in particular in the ${\eta }^{\prime }\pi$ channel, can be attributed to flavor singlet exchanges, suggesting the presence of a large gluon content that couples strongly to the produced mesons.

    hep-phhep-exEPJC(2021)·22 citations
14. 14*

    Gravitational SIMPs

    Basabendu Barman🇨🇴 · Nicolás Bernal🇨🇴

    We study the impact of thermalization and number-changing processes in the dark sector on the yield of gravitationally produced dark matter (DM). We take into account the DM production through the $s$-channel exchange of a massless graviton both from the scattering of inflatons during the reheating era, and from the Standard Model bath via the UV freeze-in mechanism. By considering the DM to be a scalar, a fermion, and a vector boson we show, in a model-independent way, that DM self-interaction gives rise to a larger viable parameter space by allowing lower reheating temperature to be compatible with Planck observed relic abundance. As an example, we also discuss our findings in the ontext of the ${\mathbb{Z}}_2$-symmetric scalar singlet DM model.

    hep-phJCAP(2021)·79 citations
15. 15*

    Higgs-strahlung boson production in the presence of a circularly polarized laser field

    M. Ouhammou🇲🇦 · M. Ouali🇲🇦 · S. Taj🇲🇦 · B. Manaut🇲🇦

    In the framework of the electroweak standard model, we investigated, in the center of mass frame, the Higgs boson production in the presence of an intense laser field via $e^{+}{e}^{-}$ annihilation $(e^{+}{e}^{-}\to ZH)$. By comparing our results with those obtained by Djouadi \cite{1} for laser-free process, we show that the circularly polarized laser field affects significantly the $s$-channel Higgs boson production. We find that for a given number of exchanged photons, laser field strength and frequency, the total cross section decreases by several orders of magnitude. These effects of laser field on cross section are found to be consistent with what was found for muon pair production via QED process in the presence of a circularly polarized laser field \cite{2}.

    hep-phhep-thLaser Phys.Lett.(2021)·27 citations
16. 16*

    A Gravitino Distance Conjecture

    Alberto Castellano🇪🇸 · Anamaría Font🇻🇪 · Alvaro Herraez🇫🇷 · Luis E. Ibáñez🇪🇸

    We conjecture that in a consistent supergravity theory with non-vanishing gravitino mass, the limit $m_{3/2}\to 0$ is at infinite distance. In particular one can write $M_{\mathrm{tower}}\sim m_{3/2}^{\delta }$ so that as the gravitino mass goes to zero, a tower of KK states as well as emergent strings becomes tensionless. This conjecture may be motivated from the Weak Gravity Conjecture as applied to strings and membranes and implies in turn the AdS Distance Conjecture. We test this proposal in classical 4d type IIA orientifold vacua in which one obtains a range of values $\frac{1}{3}\le \delta \le 1$. The parameter $\delta$ is related to the scale decoupling exponent in AdS vacua and to the $\alpha$ exponent in the Swampland Distance Conjecture for the type IIA complex structure. We present a general analysis of the gravitino mass in the limits of moduli space in terms of limiting Mixed Hodge Structures and study in some detail the case of two-moduli F-theory settings. Moreover, we obtain general lower bounds $\delta \ge \frac{1}{3},\frac{1}{4}$ for Calabi--Yau threefolds and fourfolds, respectively. The conjecture has important phenomenological implications. In particular we argue that low-energy supersymmetry of order 1 TeV is only obtained if there is a tower of KK states at an intermediate scale, of order $10^8$ GeV. One also has an upper bound for the Hubble constant upon inflation $H\lesssim m_{3/2}^{\delta }{M}_{\text{P}}^{(1-\delta )}$.

    ↳ hep-thhep-phJHEP(2021)·77 citations
17. 17*

    Purely non-perturbative AdS vacua and the swampland

    Heliudson Bernardo🇨🇦 · Suddhasattwa Brahma🇨🇦 · Keshav Dasgupta🇨🇦 · Radu Tatar🇬🇧

    In recent times, a considerable effort has been dedicated to identify certain conditions -- the so-called swampland conjectures -- with an eye on identifying effective theories which have no consistent UV-completions in string theory. In this paper, we examine the anti-de Sitter vacua corresponding to solutions which arise from purely non-perturbative contributions to the superpotential and show that these solutions satisfy the (axionic) weak gravity conjecture and the AdS-moduli scale separation conjecture. We also sketch out their advantages over other constructions.

    ↳ hep-thhep-phPRD(2021)·9 citations
18. 18*

    Non-abelian infrared divergences on the celestial sphere

    Lorenzo Magnea🇨🇭

    We consider the infrared factorisation of non-abelian multi-particle scattering amplitudes, and we study the form of the universal colour operator responsible for infrared divergences, when expressed in terms of coordinates on the `celestial sphere' intersecting the future light-cone at asymptotic distances. We find that colour-dipole contributions to the infrared operator, to all orders in perturbation theory, have a remarkably simple expression in these coordinates, with scale and coupling dependence factorised from kinematics and colour. Generalising earlier suggestions in the abelian theory, we then show that the infrared operator can be computed as a correlator of vertex operators in a conformal field theory of Lie-algebra-valued free bosons on the celestial sphere. We verify by means of the OPE that the theory correctly predicts the all-order structure of collinear limits, and the tree-level factorisation of soft real radiation.

    ↳ hep-thhep-phJHEP(2021)·58 citations
19. 19*

    Observational constraints on the cosmological expansion rate and spatial curvature

    Joseph Ryan🇺🇸

    Observations conducted over the last few decades show that the expansion of the Universe is accelerating. In the standard model of cosmology, this accelerated expansion is attributed to a dark energy in the form of a cosmological constant. It is conceivable, however, for the dark energy to exhibit mild dynamics (so that its energy density changes with time rather than having a constant value), or for the accelerated expansion of the Universe to be caused by some mechanism other than dark energy. In this work I will investigate both of these possibilities by using observational data to place constraints on the parameters of simple models of dynamical dark energy as well as cosmological models without dark energy. I find that these data favor the standard model while leaving some room for dynamical dark energy. The standard model also holds that the Universe is flat on large spatial scales. The same observational data used to test dark energy dynamics can be used to constrain the large-scale curvature of the Universe, and these data generally favor spatial flatness, with some mild preference for spatial curvature in some data combinations.

    ↳ astro-ph.COgr-qchep-phhep-th2 citations
20. 20*

    Measurements of branching fractions and asymmetry parameters of ${\Xi }_c^0\to \Lambda {\bar{K}}^{\ast 0}$, ${\Xi }_c^0\to {\Sigma }^0{\bar{K}}^{\ast 0}$, and ${\Xi }_c^0\to {\Sigma }^{+}{K}^{\ast -}$ decays at Belle

    Belle Collaboration: S. Jia · S. S. Tang · C. P. Shen · I. Adachi · H. Aihara · S. Al Said · D. M. Asner · V. Aulchenko · T. Aushev · R. Ayad · V. Babu · S. Bahinipati and 176 other authors

    Using a data sample of 980 fb${}^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we study the processes of ${\Xi }_c^0\to \Lambda {\bar{K}}^{\ast 0}$, ${\Xi }_c^0\to {\Sigma }^0{\bar{K}}^{\ast 0}$, and ${\Xi }_c^0\to {\Sigma }^{+}{K}^{\ast -}$ for the first time. The relative branching ratios to the normalization mode of ${\Xi }_c^0\to {\Xi }^{-}{\pi }^{+}$ are measured to be $$\mathcal{B}({\Xi }_c^0\to \Lambda {\bar{K}}^{\ast 0})/\mathcal{B}(\text{xic}\to {\Xi }^{-}{\pi }^{+})=0.18\pm 0.02(stat.)\pm 0.01(syst.),$$ $$\mathcal{B}({\Xi }_c^0\to {\Sigma }^0{\bar{K}}^{\ast 0})/\mathcal{B}(\text{xic}\to {\Xi }^{-}{\pi }^{+})=0.69\pm 0.03(stat.)\pm 0.03(syst.),$$ $$\mathcal{B}({\Xi }_c^0\to {\Sigma }^{+}{K}^{\ast -})/\mathcal{B}(\text{xic}\to {\Xi }^{-}{\pi }^{+})=0.34\pm 0.06(stat.)\pm 0.02(syst.),$$ where the uncertainties are statistical and systematic, respectively. We obtain %measure the branching fractions of ${\Xi }_c^0\to \Lambda {\bar{K}}^{\ast 0}$, ${\Xi }_c^0\to {\Sigma }^0{\bar{K}}^{\ast 0}$, and ${\Xi }_c^0\to {\Sigma }^{+}{K}^{\ast -}$ to be $$\mathcal{B}({\Xi }_c^0\to \Lambda {\bar{K}}^{\ast 0})=(3.3\pm 0.3(stat.)\pm 0.2(syst.)\pm 1.0(ref.))\times 10^{-3},$$ $$\mathcal{B}({\Xi }_c^0\to {\Sigma }^0{\bar{K}}^{\ast 0})=(12.4\pm 0.5(stat.)\pm 0.5(syst.)\pm 3.6(ref.))\times 10^{-3},$$ $$\mathcal{B}({\Xi }_c^0\to {\Sigma }^{+}{K}^{\ast -})=(6.1\pm 1.0(stat.)\pm 0.4(syst.)\pm 1.8(ref.))\times 10^{-3},$$ where the uncertainties are statistical, systematic, and from $\mathcal{B}(\text{xic}\to {\Xi }^{-}{\pi }^{+})$, respectively. The asymmetry parameters $\alpha ({\Xi }_c^0\to \Lambda {\bar{K}}^{\ast 0})$ and $\alpha ({\Xi }_c^0\to {\Sigma }^{+}{K}^{\ast -})$ are $0.15\pm 0.22(stat.)\pm 0.04(syst.)$ and $-0.52\pm 0.30(stat.)\pm 0.02(syst.)$, respectively, where the uncertainties are statistical followed by systematic.

    ↳ hep-exhep-phJHEP(2021)·19 citations
21. 21*

    Investigations on mixed harmonic cumulants in heavy-ion collisions at the LHC

    Ming Li🇨🇳 · You Zhou🇩🇰 · Wenbin Zhao🇨🇳 · Baochi Fu🇨🇳 · Yawen Mou🇨🇳 · Huichao Song🇨🇳

    A series of new flow observables mixed harmonic multi-particle cumulants (MHC), which allow for the first time to quantify the correlations strength between different order of flow coefficients with various moments, was investigated using hydrodynamic model. These new observables are constructed based on multi-particle cumulants, and thus by design will be less sensitive to the non-flow contaminations. In addition to the previous study of correlation involving two flow coefficients with their second moments, both correlations of three flow coefficients and the correlations of higher order moments of $v_2$ and $v_3$ are systematically investigated using iEBE-VISHNU hybrid model with two different initial conditions, AMPT and TRENTo, respectively. These systematic studies using hydrodynamic models will significantly improve the understanding on the correlations between different orders (and moments) of flow coefficients. The hydrodynamic predictions shown in this paper and the future comparisons to experimental measurements will provide more constraints on theoretical models and extract more information about the transport properties of the quark-gluon plasma created in heavy-ion collisions.

    ↳ nucl-thhep-phnucl-exPRC(2021)·12 citations
22. 22*

    Quantum variational approach to lattice gauge theory at nonzero density

    Arata Yamamoto🇯🇵

    The simulation of dense fermionic matters is a long-standing problem in lattice gauge theory. One hopeful solution would be the use of quantum computers. In this paper, digital quantum simulation is designed for lattice gauge theory at nonzero density. The quantum variational algorithm is adopted to obtain the ground state at nonzero density. A benchmark test is performed in the lattice Schwinger model.

    ↳ hep-lathep-phquant-phPRD(2021)·21 citations
23. 23*

    Gravitational Footprints of Black Holes and Their Microstate Geometries

    Ibrahima Bah🇺🇸 · Iosif Bena🇫🇷 · Pierre Heidmann🇺🇸 · Yixuan Li🇫🇷 · Daniel R. Mayerson🇫🇷

    We construct a family of non-supersymmetric extremal black holes and their horizonless microstate geometries in four dimensions. The black holes can have finite angular momentum and an arbitrary charge-to-mass ratio, unlike their supersymmetric cousins. These features make them and their microstate geometries astrophysically relevant. Thus, they provide interesting prototypes to study deviations from Kerr solutions caused by new horizon-scale physics. In this paper, we compute the gravitational multipole structure of these solutions and compare them to Kerr black holes. The multipoles of the black hole differ significantly from Kerr as they depend non-trivially on the charge-to-mass ratio. The horizonless microstate geometries have the same multipoles as their corresponding black hole, with small deviations set by the scale of their microstructure.

    ↳ hep-thastro-ph.HEgr-qchep-phJHEP(2021)·67 citations
24. 24*

    Non-perturbative methods for false vacuum decay

    Djuna Croon🇨🇦 · Eleanor Hall🇺🇸 · Hitoshi Murayama🇺🇸

    We propose a simple non-perturbative formalism for false vacuum decay using functional methods. We introduce the quasi-stationary effective action, a bounce action that non-perturbatively incorporates radiative corrections and is robust to strong couplings. The quasi-stationary effective action obeys an exact flow equation in a modified functional renormalization group with a motivated regulator functional. We demonstrate the use of this formalism in a simple toy model and compare our result with that obtained in perturbation theory.

    ↳ hep-thhep-ph22 citations
25. 25*

    Thermalization in Quenched Open Quantum Cosmology

    Subhashish Banerjee🇮🇳 · Sayantan Choudhury🇮🇳 · Satyaki Chowdhury🇮🇳 · Johannes Knaute🇩🇪 · Sudhakar Panda🇮🇳 · K.Shirish🇮🇳

    In this article, we study the quantum field theoretic generalization of the Caldeira-Leggett model in general curved space-time considering interactions between two scalar fields in a classical gravitational background. The thermalization phenomena is then studied from the obtained de Sitter solution using quantum quench from one scalar field model obtained from path integrated effective action. We consider an instantaneous quench in the time-dependent mass protocol of the field of our interest. We find that the dynamics of the field post-quench can be described in terms of the state of the generalized Calabrese-Cardy (gCC) form and computed the different types of two-point correlation functions in this context. We explicitly found the conserved charges of $W_{\infty }$ algebra that represents the gCC state after a quench in de Sitter space and found it to be significantly different from the flat space-time results. We extend our study for the different two-point correlation functions not only considering the pre-quench state as the ground state, but also a squeezed state. We found that irrespective of the pre-quench state, the post quench state can be written in terms of the gCC state showing that the subsystem of our interest thermalizes in de Sitter space. Furthermore, we provide a general expression for the two-point correlators and explicitly show the thermalization process by considering a thermal Generalized Gibbs ensemble (GGE). Finally, from the equal time momentum dependent counterpart of the obtained results for the two-point correlators, we have studied the hidden features of the power spectra and studied its consequences for different choices of the quantum initial conditions.

    ↳ hep-thcond-mat.stat-mechgr-qchep-ph+1NPB(2023)·44 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.