Fri·Jun 10, 2022Friday·June 10, 2022

1. 01*

   Quarkonium in a spin dependent quark anti-quark potential at finite temperature

   Zunara Hussain🇵🇰 · Faisal Akram🇵🇰 · Bilal Masud🇵🇰

   We study the states of $c\bar{c}$ and $b\bar{b}$ system in a non-relativistic a spin dependent potential model at finite temperature. The potential incorporate color screening effect through a parameter $\mu$. The parameter $\mu$ along with strong coupling constant ${\alpha }_s$ and string tension $\sigma$ are taken temperature dependent and their values are fitted to the Lattice data of quark anti-quark potential available at different values of temperature. The applied potential include spin-spin, spin-orbital, tensor interactions which allow us to study spin singlet and triplet states of quarkonia. By solving non-relativistic Schrödinger equation, we find the spectrum of quarkonium states at different temperature and also determine the critical temperature at which each state is dissolved. We find the critical temperature is decreased with orbital and radial excitations, however, for spin singlet and triplet states it remains same.

   hep-ph1 citation
2. 02*

   The shift-invariant orders of an ALP

   Quentin Bonnefoy🇩🇪 · Christophe Grojean🇩🇪 · Jonathan Kley🇩🇪

   It is generally believed that global symmetries, in particular axion shift symmetries, can only be approximate. This motivates us to quantify the breaking of the shift invariance that characterizes the couplings of an axion-like particle (ALP), and to identify proper order parameters associated to this breaking. Focusing on the flavorful effective Yukawa couplings to Standard Model fermions, we work out explicit conditions for them to maintain an exact axion shift symmetry. Those conditions are given in terms of Jarlskog-like flavor-invariants and can be directly evaluated from the values of the different Yukawa couplings. Therefore, they represent order parameters for the breaking of the axion shift symmetry. We illustrate this construction by matching the axion EFT to UV models, and by showing that the renormalization group running closes on those shift-breaking flavor-invariants, as it should on any complete set of order parameters. Furthermore, the study of the invariants' CP-parities indicate that all but one are CP-odd, hence the assumption of CP conservation suffices to cancel all but one sources of shift-breaking in the theory. We also investigate similar conditions in the low-energy EFT below the electroweak scale, and comment on relations inherited from a UV completion which realizes the electroweak symmetry linearly. Finally, we discuss the order parameter associated to the non-perturbative shift-breaking induced by the axion-gluons coupling, which is also flavorful.

   hep-phhep-thPRL(2023)·24 citations
3. 03*

   Pair production in inhomogeneous electric fields with phase modulation

   Li-Na Hu🇨🇳 · Orkash Amat🇨🇳 · Lie-Juan Li🇨🇳 · Melike Mohamedsedik🇨🇳 · B. S. Xie🇨🇳

   Electron-positron pair production is investigated in spatial inhomogeneous electric fields with high or/and low central frequency as well as sinusoidal phase modulation. It is found that the momentum spectrum (the reduced particle number) is more sensitive to the modulated amplitude (modulated frequency) of the phase. The stronger the modulation parameters are applied, the more remarkable the interference effect in momentum spectrum occur. In particular, for high central frequency field, an extremely good symmetry in momentum spectrum is found while it is destroyed severely when the modulated amplitude becomes large. The reduced particle number can be also enhanced greatly at about a few times or/and one order by the modulation parameters. Moreover, the effect of spatial scales on the reduced particle number are examined carefully and found that it increases rapidly at small spatial scales, while it tends to be a constant at large spatial scales. Two interesting features are revealed for the reduced particle number, i.e., the optimal modulation parameters are found and the same particle number can be got through different set of modulation parameters. The latter findings is important because one can choose different ways of phase modulation to realize the required pair number even if for the optimal pair production.

   hep-phquant-phCommun.Theor.Phys.(2023)·8 citations
4. 04*

   Phases of QCD at nonzero isospin and strangeness chemical potentials with application to pion stars

   Jens O. Andersen🇳🇴 · Martin Kjøllesdal Johnsrud🇳🇴

   We study pion and kaon condensation using three-flavor chiral perturbation theory at finite isospin and strangeness quark chemical potentials {\mu}I and {\mu}S . The phase diagram consists of a vacuum phase and three distinct Bose condensed phases with condensates of charged pions as well as charged and neutral kaons. Adding electromagnetic interactions, a phase with a charged condensate becomes a Higgs phase and the resulting phase diagram is modified due to the electromagnetic mass splittings of the mesons. The results for the pion-condensed phase are applied to calculate mass-radius relation of pion stars. Local electric charge neutrality is imposed by adding electrons, muons together with their neutrionos. Finally, we compare our results for the mass-radius relations with those from recent lattice simulations, and find very good agreement.

   hep-phgr-qc5 citations
5. 05*

   Residual flavor symmetry breaking in the landscape of modular flavor models

   Keiya Ishiguro🇯🇵 · Hiroshi Okada🇰🇷 · Hajime Otsuka🇯🇵

   We study a symmetry breaking of residual flavor symmetries realized at fixed points of the moduli space. In the supersymmetric modular invariant theories, a small departure of the modulus from fixed points is required to realize fermion mass hierarchies and sizable CP-breaking effects. We investigate whether one can dynamically fix the moduli values in the vicinity of the fixed points in the context of Type IIB string theory. It is found that the string landscape prefers $|\delta \tau |\simeq 10^{-5}$ for the deviation of the complex structure modulus from all fixed points and the CP-breaking vacuum is statistically favored. To illustrate phenomenological implications of distributions of moduli values around fixed points, we analyze the lepton sector on a concrete $A_4$ modular flavor model.

   hep-phhep-thJHEP(2022)·50 citations
6. 06*

   Tests of Low-Scale Leptogenesis in Charged Lepton Flavour Violation Experiments

   A. Granelli🇮🇹 · J. Klarić🇧🇪 · S. T. Petcov🇮🇹

   We consider low-energy tests of low-scale leptogenesis based on the type I seesaw scenario with three right-handed singlet neutrinos ${\nu }_{lR}$. In this scenario, successful leptogenesis is possible for quasi-degenerate in mass heavy Majorana neutrinos $N_{1,2,3}$, $M_{1,2,3}\cong M$, $|M_j-M_i|\ll M$, $i\ne j=1,2,3$, heavy Majorana neutrino masses $M\sim (0.05-5\times 10^5)$ GeV, and $N_j$ charged current and neutral current weak interaction couplings as large as $\mathcal{O}(10^{-2})$. We derive the constraints on the corresponding leptogenesis parameter space from the existing data from low-energy experiments, including the limits from the experiments on $\mu \to e\gamma$ decay and on the rate of $\mu -e$ conversion in gold. We show also that the planned and upcoming experiments on charged lepton flavour violation with ${\mu }^{\pm }$, MEG II on the $\mu \to e\gamma$ decay, Mu3e on $\mu \to eee$ decay, Mu2e and COMET on $\mu -e$ conversion in aluminium and PRISM/PRIME on $\mu -e$ conversion in titanium, can probe significant region of the viable leptogenesis parameter space, and thus have a potential for a discovery. Experiments on $\tau \to eee(\mu \mu \mu )$ and $\tau \to e(\mu )\gamma$ decays (e.g., BELLE II) also can probe a part of the leptogenesis parameter space, although a relatively small one.

   hep-phPLB(2023)·26 citations
7. 07*

   Pair production of neutral Higgs particles in the B-LSSM

   Dan He🇨🇳 · Tai-Fu Feng🇨🇳 · Jin-Lei Yang🇨🇳 · Guo-Zhu Ning🇨🇳 · Hai-Bin Zhang🇨🇳 · Xing-Xing Dong🇨🇳

   Higgs pair production provides a unique handle for measuring the strength of Higgs self interaction and constraining the shape of the Higgs potential. Including radiative corrections to the trilinear couplings of $CP$-even Higgs, we investigate the cross section of the lightest neutral Higgs pair production in gluon fusion at the Large Hadron Collider in the supersymmetric extensions of the standard model. Numerical results indicate that the correction to the cross section is about 11\% in the B-LSSM, while is only about 4\% in the MSSM. Considering the constraints of the experimental data of the lightest Higgs, we find that the gauge couplings of $U(1{)}_{B-L}$ and the ratio of the nonzero vacuum expectation values of two singlets also affect strongly the theoretical evaluations on the production cross section in the B-LSSM.

   hep-phJ.Phys.G(2022)·2 citations
8. 08*

   $SU(4{)}_C\times SU(2{)}_L\times U(1{)}_R$ models with modular $A_4$ symmetry

   Takaaki Nomura🇨🇳 · Hiroshi Okada🇰🇷 · Yutaro Shoji🇮🇱

   We study $SU(4{)}_C\times SU(2{)}_L\times U(1{)}_R$ models with modular $A_4$ symmetry that provide unified description of the quark and lepton sector including the flavor structures. The models are distinguished by the assignments of the modular weight on matter superfields. We carry out numerical ${\chi }^2$ analysis and search for parameter sets that accomodate the experimental results. We provide a benchmark point for each model to illustrate implications of our models.

   hep-phPTEP(2023)·18 citations
9. 09*

   Mass-Spectroscopy of hidden charm and hidden strange tetraquarks in diquark-antidiquark approach

   Rohit Tiwari🇮🇳 · Ajay Kumar Rai🇮🇳

   We investigated the four-quark systems with quark structures of $cs\bar{c}\bar{s}$, $cq\bar{c}\bar{s}$, $bs\bar{b}\bar{s}$, and $bq\bar{b}\bar{s}$ in the framework of the non-relativistic quark model, motivated by the recent observation of exotic resonances X(4140), X(4274), X(4350), X(4500), and X(4700) reported by several experiment collaborations. The colour antitriplet-triplet configuration of diquark-antidiquark combinations with all conceivable quantum numbers have been used to calculate their masses. The results reveal that if the colour structure of the diquark-antidiquark configuration is ${\bar{3}}_c\otimes 3$, the tetraquarks structures may occur otherwise may observed as resonance. The X(4274) state, can be defined as the $J^{PC}$=$2^{++}$ tetraquark state, while the X(4140) state can be regarded as the $J^{PC}$=$1^{++}$ tetraquark state in this calculation. When radial excitation is considered, X(4700) may be explained as a 2S radial excited tetraquark state with $J^{PC}$=$0^{++}$. The orbitally excited states Y(4626), Y(4630) and Y(4660) can be explained as P-wave tetraquark with quantum number $1^{--}$. The masses of [$bs\bar{b}\bar{s}$] and [$bq\bar{b}\bar{s}$] are found to be in the range between 10.5 GeV- 11.5 GeV and are very close to two-meson thresholds.

   hep-phFew Body Syst.(2023)·21 citations
10. 10*

    Gauge flavour unification: from the flavour puzzle to stable protons

    Joe Davighi🇨🇭

    The idea of unification attempts to explain the structure of the Standard Model (SM) in terms of fewer fundamental forces and/or matter fields. However, traditional grand unified theories based on $SU(5)$ and $\mathrm{Spin}(10)$ shed no light on the existence of three generations of fermions, nor the distinctive pattern of their Yukawa couplings to the Higgs. We discuss two routes for unifying the SM gauge symmetry with its flavour symmetries: firstly, unifying flavour with electroweak symmetries via the group $SU(4)\times Sp(6{)}_L\times Sp(6{)}_R$; secondly, unifying flavour and colour via $SU(12)\times SU(2{)}_L\times SU(2{)}_R$. In either case, all three generations of SM fermions are unified into just two fundamental fields. In the larger part of this proceeding, we describe how the former model of `electroweak flavour unification' offers a new explanation of hierarchical fermion masses and CKM angles. As a postscript, we show that gauge flavour unification can have unexpected spin-offs not obviously related to flavour. In particular, the $SU(12)\times SU(2{)}_L\times SU(2{)}_R$ symmetry, when broken, can leave behind remnant discrete gauge symmetries that exactly stabilize protons to all orders.

    hep-phhep-thNuovo Cim.C(2022)·7 citations
11. 11*

    Investigating the color-suppressed decays ${\Lambda }_b\to \Lambda \psi$ in the perturbative QCD approach

    Zhou Rui🇨🇳 · Chao-Qi Zhang🇨🇳 · Jia-Ming Li🇨🇳 · Meng-Kun Jia🇨🇳

    The nonleptonic two-body ${\Lambda }_b\to \Lambda \psi$ decays with $\psi =J/\psi$ or $\psi (2S)$ are investigated based on the perturbative QCD approach. These are color-suppressed processes in which the nonfactorizable contributions are confirmed to be dominant. Angular momentum conservation allows us to describe the concerned decays by four independent complex helicity amplitudes. It is observed that the negative-helicity states for the $\Lambda$ baryon are preferred as expected in the left-handed nature of the charged-current interaction. The obtained results for the helicity amplitudes are used to compute the branching ratios and various observable parameters, which are then compared to the existing theoretical predictions and experimental data. In particular, we predict the ratio $\mathcal{R}=\frac{\mathcal{B}({\Lambda }_b\to \Lambda \psi (2S))}{\mathcal{B}({\Lambda }_b\to \Lambda J/\psi )}=0.47_{-0.00}^{+0.02}$ in comparison with $0.508\pm 0.023$ from the Particle Data Group at the level of 1 standard deviation. We also briefly explore the long-distance contributions to the semileptonic ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ decays in the kinematic regions where the dilepton invariant masses are around the $J/\psi$ and $\psi (2S)$ resonances.

    hep-phPRD(2022)·19 citations
12. 12*

    Off-forward anomalous dimensions in the leading-$n_f$ limit

    S. Van Thurenhout🇩🇪 · S. Moch🇩🇪

    We review the computation of off-forward anomalous dimensions in the limit of a large number of quark flavors $n_f$. The method is based on a consistency relation the anomalous dimensions have to obey, which is a direct consequence of the renormalization structure of the operators in the chiral limit. In addition, we present a way to generate the anomalous dimensions to all orders in the strong coupling ${\alpha }_s$. This is based on exact conformal symmetry at the Wilson-Fisher critical point and provides an extension of previous calculations of this type for the forward anomalous dimensions.

    hep-phPoS(2022)·4 citations
13. 13*

    Heavy Neutral Leptons -- Advancing into the PeV domain

    Kevin A. Urquía-Calderón🇩🇰 · Inar Timiryasov🇩🇰 · Oleg Ruchayskiy🇩🇰

    Heavy neutral leptons (HNLs) are hypothetical particles able to explain neutrino oscillations and provide a mechanism for generating the baryon asymmetry of the Universe. Quantum corrections due to such particles give rise to flavor violating processes in the charged lepton sector. Based on the fact that these corrections grow with HNL masses, we improve existing constraints by orders of magnitude in mass and mixing angle. This allows us to probe part of the parameter space of leptogenesis with multi-TeV HNLs. We also show that one will be able to infer HNL parameters in a significant portion of the parameter space for TeV-PeV masses if charged lepton flavor violating signals are detected.

    hep-phhep-exJHEP(2023)·28 citations
14. 14*

    Interplay between the $R_{D^{(\ast )}}$ anomaly and the LHC

    Syuhei Iguro🇩🇪

    The current discrepancy in $R_{D^{(\ast )}}=BR(\bar{B}\to D^{(\ast )}\tau \bar{\nu })/BR(\bar{B}\to D^{(\ast )}\ell \bar{\nu })$ where $\ell =e,\mu$ may imply a know particle with the mass around the order of TeV. Therefore it is well motivated to test those scenarios at the large hadron collider. Thanks to the size of the discrepancy and the analysis based on the effective field theory, the variety of the possible new physics candidates is limited. We focus on the charged Higgs and leptoquark possibility and discuss the collider physics.

    hep-ph0 citations
15. 15*

    Chiral condensate from a hadron resonance gas model

    Deeptak Biswas🇮🇳 · Peter Petreczky🇺🇸 · Sayantan Sharma🇮🇳

    In this work we address the question of how well the chiral crossover transition can be understood in terms of a noninteracting hadron resonance gas model. Using the latest results on the variation of hadron masses as a function of the pion mass from lattice quantum chromodynamics, we study the temperature dependence of the renormalized chiral condensate in 2+1 flavor QCD. Furthermore, we suggest a better criterion to estimate of the pseudocritical temperature, which gives $T_c=161.2\pm 1.7$ MeV, which is much improved compared to all the earlier results within the hadron resonance gas model or chiral perturbation theory. For the curvature of the pseudocritical line we find ${\kappa }_2=0.0203(7)$, which is in very good agreement with continuum extrapolated lattice results.

    hep-phhep-latnucl-thPRC(2022)·11 citations
16. 16*

    Double-charm heptaquark states composed of two charmed mesons and one nucleon

    Si-Qiang Luo🇨🇳 · Li-Sheng Geng🇨🇳 · Xiang Liu🇨🇳

    Inspired by the experimental discoveries of $T_{cc}$, ${\Sigma }_c(2800)$, and ${\Lambda }_c(2940)$ and the theoretical picture where they are $D{D}^{\ast }$, $DN$, and $D^{\ast }N$ molecular candidates, we investigate the double charm heptaquark system of $D{D}^{\ast }N$. We employ the one-boson-exchange model to deduce the pairwise $D$-$D^{\ast }$, $D$-$N$, and $D^{\ast }$-$N$ potentials and then study the $D{D}^{\ast }N$ system with the Gaussian expansion method. We find two good hadronic molecular candidates with $I(J^P)=\frac{1}{2}({\frac{1}{2}}^{-})$ and $\frac{1}{2}({\frac{3}{2}}^{-})$ $D{D}^{\ast }N$ with only $s$-wave pairwise interactions. The conclusion remains unchanged even taking into account the $S$-$D$ mixing and coupled channel effects. In addition to providing the binding energies, we also calculate the root-mean-square radii of the $D{D}^{\ast }N$ system, which further support the molecular nature of the predicted states. They can be searched for at the upcoming LHC run 3 and run 4.

    hep-phhep-exPRD(2022)·22 citations
17. 17*

    Neutrino physics and non-standard interactions

    Vicente Pleitez🇧🇷

    In most of the proposals for new physics beyond the standard model, neutrinos have new interactions and some of them have phenomenological consequences that, although at present they may seem purely academic, probably will have to be taken into account in the future neutrino experiments. Here we show that new interactions may imply the misidentification of the flavour of the neutrinos, and the experimental ability to distinguish neutrinos from antineutrinos.

    hep-phhep-ex0 citations
18. 18*

    Higgs-mass prediction in the NMSSM with heavy BSM particles

    Emanuele Bagnaschi🇨🇭 · Mark Goodsell🇫🇷 · Pietro Slavich🇫🇷

    We address the prediction for the mass of the SM-like Higgs boson in NMSSM scenarios where all BSM particles, including the singlets, have masses at the TeV scale. We provide a full one-loop computation of the matching condition for the quartic Higgs coupling in the NMSSM, supplemented with the two-loop contributions that involve the strong gauge coupling. We discuss the impact of the one- and two-loop corrections that are specific to the NMSSM on the prediction for the Higgs mass, and propose a method to estimate of the uncertainty associated with the uncomputed higher-order terms. Finally, we illustrate how the measured value of the Higgs mass can be used to constrain some yet-unmeasured parameters of the NMSSM.

    hep-phEPJC(2022)·7 citations
19. 19*

    Leptogenesis triggered by a first-order phase transition

    Peisi Huang🇺🇸 · Ke-Pan Xie🇺🇸

    We propose a new scenario of leptogenesis, which is triggered by a first-order phase transition (FOPT). The right-handed neutrinos (RHNs) are massless in the old vacuum, while they acquire a mass in the new vacuum bubbles, and the mass gap is huge compared with the FOPT temperature. The ultra-relativistic bubble walls sweep the RHNs into the bubbles, where the RHNs experience fast decay and generate the lepton asymmetry, which is further converted to the baryon asymmetry of the Universe (BAU). Since the RHNs are out of equilibrium inside the bubble, the generated BAU does not suffer from the thermal bath washout. We first discuss the general feature of such a FOPT leptogenesis mechanism, and then realize it in an extended $B-L$ model. The gravitational waves from $U(1{)}_{B-L}$ breaking could be detected at the future interferometers.

    hep-phastro-ph.COJHEP(2022)·81 citations
20. 20*

    Vacuum stability of the scalar potential in the compact 341 model

    Meriem Djouala🇩🇿 · Noureddine Mebarki🇩🇿

    By applying the concepts of copositivity and using the gauge orbit spaces on the scalar potential, we derive analytic necessary and sufficient conditions which guarantee the boundedness of the scalar potential in all the directions in the field space at the tree level in the context of the compact 341 model.

    hep-ph0 citations
21. 21*

    Time-dependent and quasi-steady features of fast neutrino-flavor conversion

    Hiroki Nagakura🇯🇵 · Masamichi Zaizen🇯🇵

    Despite the theoretical indication that fast neutrino-flavor conversion (FFC) ubiquitously occurs in core-collapse supernova and binary neutron star merger, the lack of global simulations has been the greatest obstacle to study their astrophysical consequences. In this {\it Letter}, we present large-scale ($50\mathrm{km}$) simulations of FFC in spherical symmetry by using a novel approach. We effectively rescale the oscillation scale of FFC by reducing the number of injected neutrinos in the simulation box, and then extrapolate back to the case of the target density of neutrinos with a convergence study. We find that FFC in all models achieves quasi-steady state in the non-linear regime, and its saturation property of FFC is universal. We also find that temporal- and spatial variations of FFC are smeared out at large radii due to phase cancellation through neutrino self-interactions. Finally, we provide a new diagnostic quantity, ELN-XLN angular crossing, to assess the non-linear saturation of FFC.

    ↳ astro-ph.HEhep-exhep-phnucl-thPRL(2022)·85 citations
22. 22*

    General-Relativistic Quantum-Kinetics Neutrino Transport

    Hiroki Nagakura🇯🇵

    We developed a new general-relativistic quantum-kinetics neutrino transport code, GRQKNT, for numerical studies of quantum kinetics of non-equilibrium neutrinos in six-dimensional phase space. This code is intended for use in both local and global simulations of neutrino transport in core-collapse supernova and binary neutron star merger. It has been widely recognized that global simulations of collective neutrino oscillations, in particular fast neutrino-flavor conversions (FFC), require unfeasible computational resources due to large disparity of scales between flavor conversion and astrophysical phenomena. We propose a novel approach to tackle the issue. This paper is devoted to describe the philosophy, design, and numerical implementation of GRQKNT with a number of tests ensuring correct implementation of each module. The code is based on a discrete-ordinate Sn method, finite-difference realization of mean-field quantum kinetic equation. The transport equation is solved based on a conservative formalism, and we use a fifth-order weighted essentially non-oscillatory scheme with fourth-order TVD Runge-Kutta time-integration. The transport module is designed to work with arbitrary spacetimes and currently three different stationary spacetimes (flat spacetime, Schwarzschild black hole, and Kerr black hole) are implemented. The collision term including neutrino emission, absorption, and momentum-exchanged scatterings are also implemented into our code. The oscillation Hamiltonian consists of vacuum, matter, and self-interactions. Both two- and three neutrino-flavor scenarios can be applied. Fluid-velocity dependences in transport-, collision-, and oscillation modules, are also treated self-consistently by using two-energy-grid technique, that has been already established in our another code with full Boltzmann neutrino transport.

    ↳ astro-ph.HEgr-qchep-exhep-ph+1PRD(2022)·39 citations
23. 23*

    Simplifying Polylogarithms with Machine Learning

    Aurélien Dersy🇺🇸 · Matthew D. Schwartz🇺🇸 · Xiaoyuan Zhang🇺🇸

    Polylogrithmic functions, such as the logarithm or dilogarithm, satisfy a number of algebraic identities. For the logarithm, all the identities follow from the product rule. For the dilogarithm and higher-weight classical polylogarithms, the identities can involve five functions or more. In many calculations relevant to particle physics, complicated combinations of polylogarithms often arise from Feynman integrals. Although the initial expressions resulting from the integration usually simplify, it is often difficult to know which identities to apply and in what order. To address this bottleneck, we explore to what extent machine learning methods can help. We consider both a reinforcement learning approach, where the identities are analogous to moves in a game, and a transformer network approach, where the problem is viewed analogously to a language-translation task. While both methods are effective, the transformer network appears more powerful and holds promise for practical use in symbolic manipulation tasks in mathematical physics.

    ↳ cs.LGhep-phhep-thmath-ph+1Int.J.Data Sci.Math.Sci.(2023)·39 citations
24. 24*

    Interpolating between small- and large-$g$ expansions using Bayesian Model Mixing

    A. C. Semposki🇺🇸 · R. J. Furnstahl🇺🇸 · D. R. Phillips🇺🇸

    Bayesian Model Mixing (BMM) is a statistical technique that can be used to combine models that are predictive in different input domains into a composite distribution that has improved predictive power over the entire input space. We explore the application of BMM to the mixing of two expansions of a function of a coupling constant $g$ that are valid at small and large values of $g$ respectively. This type of problem is quite common in nuclear physics, where physical properties are straightforwardly calculable in strong and weak interaction limits or at low and high densities or momentum transfers, but difficult to calculate in between. Interpolation between these limits is often accomplished by a suitable interpolating function, e.g., Padé approximants, but it is then unclear how to quantify the uncertainty of the interpolant. We address this problem in the simple context of the partition function of zero-dimensional ${\varphi }^4$ theory, for which the (asymptotic) expansion at small $g$ and the (convergent) expansion at large $g$ are both known. We consider three mixing methods: linear mixture BMM, localized bivariate BMM, and localized multivariate BMM with Gaussian processes. We find that employing a Gaussian process in the intermediate region between the two predictive models leads to the best results of the three methods. The methods and validation strategies we present here should be generalizable to other nuclear physics settings.

    ↳ nucl-thhep-phphysics.data-anPRC(2022)·14 citations
25. 25*

    Constraints on Sub-GeV Dark Matter--Electron Scattering from the CDEX-10 Experiment

    Z. Y. Zhang · L. T. Yang · Q. Yue · K. J. Kang · Y. J. Li · M. Agartioglu · H. P. An · J. P. Chang · Y. H. Chen · J. P. Cheng · W. H. Dai · Z. Deng and 73 other authors

    We present improved germanium-based constraints on sub-GeV dark matter via dark matter--electron ($\chi$-$e$) scattering using the 205.4 kg$\cdot$day dataset from the CDEX-10 experiment. Using a novel calculation technique, we attain predicted $\chi$-$e$ scattering spectra observable in high-purity germanium detectors. In the heavy mediator scenario, our results achieve 3 orders of magnitude of improvement for $m_{\chi }$ larger than 80 MeV/c${}^2$ compared to previous germanium-based $\chi$-$e$ results. We also present the most stringent $\chi$-$e$ cross-section limit to date among experiments using solid-state detectors for $m_{\chi }$ larger than 90 MeV/c${}^2$ with heavy mediators and $m_{\chi }$ larger than 100 MeV/c${}^2$ with electric dipole coupling. The result proves the feasibility and demonstrates the vast potential of a new $\chi$-$e$ detection method with high-purity germanium detectors in ultralow radioactive background.

    ↳ hep-exhep-phphysics.ins-detPRL(2022)·81 citations
26. 26*

    Entropy Production in the Inflationary Epoch Using the Gouy-Stodola Theorem

    R. H. Longaresi · S. D. Campos🇧🇷

    In this work, we use the Gouy-Stodola theorem to calculate the entropy production rate in the inflationary epoch of the universe. This theorem allows us the simple calculation of entropy and entropy production rate occasioned by the decaying of the inflaton scalar field. Both the entropy and entropy production rate achieve large values, agreeing with the expected values present in the literature.

    ↳ gr-qchep-phhep-thInt.J.Mod.Phys.A(2022)·3 citations
27. 27*

    QED as a many-body theory of worldlines: I. General formalism and infrared structure

    Xabier Feal🇺🇸 · Andrey Tarasov🇺🇸 · Raju Venugopalan🇺🇸

    We discuss a reformulation of QED in which matter and gauge fields are integrated out explicitly, resulting in a many-body Lorentz covariant theory of 0+1 dimensional worldlines describing super-pairs of spinning charges interacting through Lorentz forces. This provides a powerful, string inspired definition of amplitudes to all loop orders. In particular, one obtains a more general formulation of Wilson loops and lines, with exponentiated dynamical fields and spin precession contributions, and worldline contour averages exactly defined through first quantized path integrals. We discuss in detail the attractive features of this formalism for high order perturbative computations. We show that worldline S-matrix elements, to all loop orders in perturbation theory, can be constructed to be manifestly free of soft singularities, with infrared (IR) divergences captured and removed by endpoint photon exchanges at infinity that are equivalent to the soft coherent dressings of the Dyson S-matrix proposed by Faddeev and Kulish. We discuss these IR structures and make connections with soft theorems, the Abelian exponentiation of IR divergences and cusp anomalous dimensions. Follow-up papers will discuss the efficient computation of cusp anomalous dimensions and universal features of soft theorems.

    ↳ hep-thhep-phnucl-thPRD(2022)·17 citations
28. 28*

    Spectrum of light nuclei in a finite volume

    Roee Yaron🇮🇱 · Betzalel Bazak🇮🇱 · Martin Schäfer🇮🇱 · Nir Barnea🇮🇱

    Lattice quantum chromodynamics calculations of multi-baryon systems with physical quark masses would start a new age of ab initio predictions in nuclear physics. Performed on a finite grid, such calculations demand extrapolation of their finite volume numerical results to free-space physical quantities. Such extraction of the physical information can be carried out fitting effective field theories (EFTs) directly to the finite-volume results or utilizing the Lüscher free-space formula or its generalizations for extrapolating the lattice data to infinite volume. To understand better the effect of periodic boundary conditions on the binding energy of few nucleon systems we explore here light nuclei with physical masses in a finite box and in free space. The stochastic variational method is used to solve the few-body systems. Substantial optimizations of the method are introduced to enable efficient calculations in a periodic box. With the optimized code, we perform accurate calculations of light nuclei $A\le 4$ within leading order pionless EFT. Using Lüscher formula for the two-body system, and its generalization for 3- and 4-body systems, we examine the box effect and explore possible limitations of these formulas for the considered nuclear systems.

    ↳ nucl-thhep-lathep-phPRD(2022)·11 citations
29. 29*

    Searching for the QCD critical point along the pseudo-critical/freeze-out line using Padé-resummed Taylor expansions of cumulants of conserved charge fluctuations

    Jishnu Goswami🇯🇵 · Frithjof Karsch🇩🇪 · Swagato Mukherjee🇺🇸 · Christian Schmidt🇩🇪

    Using high-statistics datasets generated in (2+1)-flavor QCD calculations at finite temperature we construct estimators for the radius of convergence from an eighth order series expansion of the pressure as well as the number density. We show that the estimator for pressure and number density will be identical in the asymptotic limit. In the vicinity of the pseudo-critical temperature, $T_{pc}\simeq 156.5$~MeV, we find the estimator of the radius of convergence to be ${\mu }_B/T\gtrsim 3$ for strangeness-neutral matter. We also present results for the pole structure of the Padé approximants for the pressure at non-zero values of the baryon chemical potential and show that the pole structure of the [4,4] Padé is consistent with not having a critical point at temperatures larger than $135$MeV and a baryon chemical potential smaller than ${\mu }_B/T\sim 2.5$.

    ↳ hep-lathep-phnucl-thActa Phys.Polon.Supp.(2023)·2 citations
30. 30*

    Reinterpreting deformed Heisenberg algebras

    Fabian Wagner🇵🇱

    Minimal and maximal uncertainties of position measurements are widely considered possible hallmarks of low-energy quantum as well as classical gravity. While General Relativity describes interactions in terms of spatial curvature, its quantum analogue may also extend to the realm of curved momentum space as suggested, e. g. in the context of Relative Locality in Deformed Special Relativity. Drawing on earlier work, we show in an entirely Born reciprocal, i. e. position and momentum space covariant, way that the quadratic Generalized Extended Uncertainty principle can alternatively be described in terms of quantum dynamics on a general curved cotangent manifold. In the case of the Extended Uncertainty Principle the curvature tensor in position space is proportional to the noncommutativity of the momenta, while an analogous relation applies to the curvature tensor in momentum space and the noncommutativity of the coordinates for the Generalized Uncertainty Principle. In the process of deriving this map, the covariance of the approach constrains the admissible models to an interesting subclass of noncommutative geometries which has not been studied before. Furthermore, we reverse the approach to derive general anisotropically deformed uncertainty relations from general background geometries. As an example, this formalism is applied to (anti)-de Sitter spacetime.

    ↳ gr-qchep-phhep-thEPJC(2023)·16 citations
31. 31*

    A self-consistent wave description of axion miniclusters and their survival in the galaxy

    Virgile Dandoy🇩🇪 · Thomas Schwetz🇩🇪 · Elisa Todarello🇮🇹

    We present a solution of the Schrödinger-Poisson system based on the WKB ansatz for the wave function. In this way we obtain a description of a gravitationally bound clump of axion dark matter by a superposition of energy eigenstates with random phases. It can be applied to any self-consistent pair of radial density distribution and phase space density $f(E)$ related by Eddington's formula. We adopt this as a model for axion miniclusters in our galaxy and use it to study the mass loss due to a star encounter by using standard perturbation theory methods known from quantum mechanics. Finally, we perform a Monte Carlo study to estimate the surviving fraction of axion miniclusters in the dark matter halo of our galaxy. We find that the reaction to perturbations and the survival probability depend crucially on the density profile. Weakly bound clusters are heated up and eventually destroyed, whereas more strongly bound systems get even more compact as a result of perturbations and are driven towards an axion star configuration.

    ↳ astro-ph.COhep-phJCAP(2022)·31 citations
32. 32*

    Maximally symmetric nonlinear extension of electrodynamics and charged particles

    Kurt Lechner🇮🇹 · Pieralberto Marchetti🇮🇹 · Andrea Sainaghi🇮🇹 · Dmitri P. Sorokin🇮🇹

    We consider couplings of electrically and magnetically charged sources to the maximally symmetric non-linear extension of Maxwell's theory called ModMax. The aim is to reveal physical effects which distinguish ModMax from Maxwell's electrodynamics. We find that, in contrast to generic models of non-linear electrodynamics, Lienard-Wiechert fields induced by a moving electric or magnetic particle, or a dyon are exact solutions of the ModMax equations of motion. We then study whether and how ModMax non-linearity affects properties of electromagnetic interactions of charged objects, in particular the Lorentz force, the Coulomb law, the Lienard-Wiechert fields, Dirac's and Schwinger's quantization of electric and magnetic charges, and the Compton Effect. In passing we also present an alternative form of the ModMax Lagrangian in terms of the coupling of Maxwell's theory to axion-dilaton-like auxiliary scalar fields which may be relevant for revealing the effective field theory origin of ModMax.

    ↳ hep-thcond-mat.str-elgr-qchep-phPRD(2022)·76 citations
33. 33*

    Recursion Relations for One-Loop Goldstone Boson Amplitudes

    Christoph Bartsch🇨🇿 · Karol Kampf🇨🇿 · Jaroslav Trnka🇺🇸

    In this letter, we construct the recursion relations for one-loop planar integrands in the SU(N) non-linear sigma model. This generalizes the soft recursions for tree-level amplitudes in a variety of quantum field theories with special soft limits. The main ingredient is the definition of the one-loop planar integrand, which is fixed by cuts in the sense of generalized unitarity and by requiring the Adler zero on all external legs. We show that this does not uniquely fix the integrand, so additional constraints on the soft behavior of the loop momentum have to be imposed. Our work is the first step in extending modern amplitudes methods for loop amplitudes to effective field theories with special soft limits.

    ↳ hep-thhep-phPRD(2022)·23 citations
34. 34*

    Jackiw-Teitelboim Gravity from the Karch-Randall Braneworld

    Hao Geng🇺🇸 · Andreas Karch🇺🇸 · Carlos Perez-Pardavila🇺🇸 · Suvrat Raju🇮🇳 · Lisa Randall🇺🇸 · Marcos Riojas🇺🇸 · Sanjit Shashi🇺🇸

    In this letter, we show that Jackiw-Teitelboim (JT) gravity can be naturally realized in the Karch-Randall braneworld. Notably the role of the dilaton in JT gravity is played by the radion in a suitably orbifolded version of the setup. In the classical entanglement entropy calculation, there is an apparent degeneracy of Ryu-Takayanagi surfaces. We demonstrate how quantum fluctuations of the radion/dilaton resolves this would-be classical puzzle regarding entanglement wedge reconstruction.

    ↳ hep-thgr-qchep-phPRL(2022)·71 citations
35. 35*

    Pulsars Do Not Produce Sharp Features in the Cosmic-Ray Electron and Positron Spectra

    Isabelle John🇸🇪 · Tim Linden🇸🇪

    Pulsars are considered to be the leading explanation for the excess in cosmic-ray positrons detected by PAMELA and AMS-02. A notable feature of standard pulsar models is the sharp spectral cutoff produced by the increasingly efficient cooling of very-high-energy electrons by synchrotron and inverse-Compton processes. This spectral break has been employed to: (1) constrain the age of pulsars that contribute to the excess, (2) argue that a large number of pulsars must significantly contribute to the positron flux, and (3) argue that spectral cutoffs cannot distinguish between dark matter and pulsar models. We prove that this spectral feature does not exist -- it appears due to approximations that treat inverse-Compton scattering as a continuous, instead of as a discrete and catastrophic, energy-loss process. Astrophysical sources do not produce sharp spectral features via cooling, reopening the possibility that such a feature would provide incontrovertible evidence for dark matter.

    ↳ astro-ph.HEhep-phPRD(2023)·18 citations
36. 36*

    Effective Theory of Warped Compactifications and the Implications for KKLT

    Severin Lüst🇺🇸 · Lisa Randall🇺🇸

    We argue that effective actions for warped compactifications can be subtle, with large deviations in the effective potential from naive expectations owing to constraint equations from the higher-dimensional metric. We demonstrate this deviation in a careful computation of the effective potential for the conifold deformation parameter of the Klebanov-Strassler solution. The uncorrected naive effective potential for the conifold was previously used to argue that the Klebanov-Strassler background would be destabilized by antibranes placed at the conifold infrared tip unless the flux was uncomfortably large. We show this result is too strong because the formerly neglected constraint equations eliminate the features of the potential that allowed for the instability in the de Sitter uplift of the KKLT scenario.

    ↳ hep-thhep-phFortsch.Phys.(2022)·47 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.