Wed·Mar 27, 2024Wednesday·March 27, 2024

1. 01*

   Majorana Neutrinos and Dark Matter from Anomaly Cancellation

   Hridoy Debnath🇺🇸 · Pavel Fileviez Perez🇺🇸 · Kevin Gonzalez-Quesada🇺🇸

   We discuss a simple theory for neutrino masses where the total lepton number is a local gauge symmetry spontaneously broken below the multi-TeV scale. In this context, the neutrino masses are generated through the canonical seesaw mechanism and a Majorana dark matter candidate is predicted from anomaly cancellation. We discuss in great detail the dark matter annihilation channels and find out the upper bound on the symmetry breaking scale using the cosmological bounds on the relic density. Since in this context the dark matter candidate has suppressed couplings to the Standard Model quarks, one can satisfy the direct detection bounds even if the dark matter mass is close to the electroweak scale. This theory predicts a light pseudo-Nambu-Goldstone boson (the Majoron) associated to the mechanism of neutrino mass. We discuss briefly the properties of the Majoron and the impact of the Big Bang Nucleosynthesis bounds.

   hep-phhep-exPRD(2024)·6 citations
2. 02*

   Kinetic theory of vacuum pair production in uniform electric fields revisited

   I. A. Aleksandrov🇷🇺 · A. Kudlis🇮🇸 · A. I. Klochai🇷🇺

   We investigate the phenomenon of electron-positron pair production from vacuum in the presence of a uniform time-dependent electric field of arbitrary polarization. Taking into account the interaction with the external classical background in a nonperturbative manner, we quantize the electron-positron field and derive a system of ten quantum kinetic equations (QKEs) showing that the previously-used QKEs are incorrect once the external field rotates in space. We employ then the Wigner-function formalism of the field quantization and establish a direct connection between the Dirac-Heisenberg-Wigner (DHW) approach to investigating the vacuum pair-production process and the QKEs. We provide a self-contained description of the two theoretical frameworks rigorously proving their equivalence and present an exact one-to-one correspondence between the kinetic functions involved within the two techniques. Special focus is placed on the analysis of the spin effects in the final particle distributions.

   hep-phhep-thPRResearch(2024)·20 citations
3. 03*

   The role of the Look Elsewhere Effect in determining the significance of an oscillation disappearance search for a light sterile neutrino

   Gioacchino Ranucci🇮🇹

   In the ongoing vibrant experimental quest to assess whether the numerous indications for a light sterile neutrino are only experimental fluctuations or the manifestations of a profound and real underlying effect, one aspect which has recently attracted a specific interest is the statistical treatment of the data. Especially in cases of supposed positive hints, the correct statistical assessment of their significance is of paramount importance, to avoid that potential overstatements lead to a wrong understanding of the real status of the experimental investigation in the field. In this work I show how latest crucial advancements in the statistical data processing for the interpretation of the output of a sterile search can be effectively put and understood in the context of the Look Elsewhere Effect phenomenon, developed and now of routine usage for results interpretation in other areas of HEP research.

   hep-phphysics.data-an0 citations
4. 04*

   The flavor structures on magnetized orbifold models and 4D modular symmetric models

   Shota Kikuchi🇯🇵

   We study quark and lepton flavor structures on magnetized $T^2/{\mathbb{Z}}_2$ twisted orbifold model. There are 6,460 number of flavor models but most of them cannot lead to realistic flavor observables because of the difficulties on realizing mass hierarchies and small (large) mixing angles of quarks (leptons). We find that certain zero point patterns of zero-modes of fermions and Higgs fields give the flavor models being able to avoid these difficulties. We classify such flavor models and show numerical example. Next we study four-dimensional (4D) modular symmetric quark flavor models without fine-tuning. Mass matrices become hierarchical as close to the modular symmetric points depending on its residual charges. Actually the residual $Z_N$ symmetries with $N\ge 6$ can originate the large quark mass hierarchies. Also the products of residual symmetries such as $Z_3\times Z_3\times Z_3$ have such possibility. We study the quark flavor model with ${\Gamma }_6$ symmetry and $A_4\times A_4\times A_4$ symmetry. We assume the vicinity of the cusp $\tau =i\infty$ where residual $Z_6$ and $Z_3\times Z_3\times Z_3$ symmetry remain. Consequently we find the models realizing the order of the quark mass ratios and the absolute values of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements without fine-tuning. Finally we construct the Siegel modular forms. Zero-modes on $T^6$ at $\vec{z}=0$ are the Siegel modular forms of weight 1/2 for the subgroup of $Sp(6,\mathbb{Z})$. They have several moduli parameters and therefore have the possibility realizing the flavor structures including the CP phases. We study the Siegel modular forms transformed by $\tilde{\Delta }(96)$ and show numerical example. We find one of moduli parameters ${\omega }_1$ works on the large mass hierarchies and ${\omega }_2$ works on the CP violation successfully in our model.

   hep-phhep-th0 citations
5. 05*

   Inclusive and diffractive dijet photoproduction in ultraperipheral Pb-Pb collisions at the LHC

   V. Guzey (Jyvaskyla U. and Helsinki Inst. of Phys.)🇫🇮

   In this contribution, we summarize NLO pQCD predictions for inclusive and diffractive dijet photoproduction in Pb-Pb UPCs at the LHC. We demonstrate that the theory describes well the preliminary ATLAS data on the inclusive cross section, which probes nuclear parton distributions (PDFs) down to $x_A\approx 0.005$ and which can reduce current uncertainties of the small-$x$ nuclear gluon distribution by approximately a factor of 2. Employing predictions of the leading twist approach to nuclear shadowing for nuclear diffractive PDFs, we calculate the cross section of diffractive dijet photoproduction and show that its $x_{\gamma }$ dependence is sensitive to the effect of nuclear shadowing and the mechanism of QCD factorization breaking in hard diffraction. We also find that due to large leading twist nuclear shadowing and restricted kinematics, the diffractive contribution to the inclusive cross section of dijet photoproduction does not exceed $5-10$%, which helps with an ambiguous interpretation of the ATLAS data.

   hep-phhep-exnucl-exPhys.Proc.UPC(2024)·1 citation
6. 06*

   Resurrecting the LHC discovery potential in the extended Type-II Seesaw Model

   Upalaparna Banerjee🇮🇳 · Christoph Englert🇬🇧 · Wrishik Naskar🇬🇧

   The juxtaposition of the precision of lepton flavour measurements and the limited energy range of the Large Hadron Collider (LHC) to discover dynamical degrees of freedom linked to the generation of the observed lepton mass patterns naively suggests only a limited relevance of the LHC's high luminosity phase. This, potentially, extends to future colliders. Using the concrete example of the type-II seesaw model and its effective field theory extension, we show that blind directions create a rich phenomenological interplay of muon precision measurements and electroweak resonance searches at present and future colliders, with testable implications for the HL-LHC phase.

   hep-phhep-exPRD(2024)·7 citations
7. 07*

   Dynamical origin of neutrino masses and dark matter from a new confining sector

   Maximilian Berbig🇪🇸 · Juan Herrero-Garcia🇪🇸 · Giacomo Landini🇪🇸

   A dynamical mechanism, based on a confining non-abelian dark symmetry, which generates Majorana masses for hypercharge-less fermions, is proposed. We apply it to the inverse seesaw scenario, which allows to generate light neutrino masses from the interplay of TeV-scale Pseudo-Dirac mass terms and a small explicit breaking of lepton number. A single generation of vector-like dark quarks, transforming under a $\text{SU}(3{)}_{\text{D}}$ gauge symmetry, is coupled to a real singlet scalar, which serves as a portal between the dark quark condensate and three generations of heavy sterile neutrinos. Such a dark sector and the Standard Model (SM) are kept in thermal equilibrium with each other via sizeable Yukawa couplings to the heavy neutrinos. In this framework the lightest dark baryon, which has spin $3/2$ and is stabilized at the renormalizable level by an accidental dark baryon number symmetry, can account for the observed relic density via thermal freeze-out from annihilations into the lightest dark mesons. These mesons in turn decay to heavy neutrinos, which produce SM final states upon decay. This model may be probed by next generation neutrino telescopes via neutrino lines produced from dark matter annihilations.

   hep-phPRD(2024)·6 citations
8. 08*

   A realistic method to access heavy meson light-cone distribution amplitudes from first-principle

   Xue-Ying Han🇨🇳 · Jun Hua🇨🇳 · Xiangdong Ji🇺🇸 · Cai-Dian Lü🇨🇳 · Wei Wang🇨🇳 · Ji Xu🇨🇳 · Qi-An Zhang🇨🇳 · Shuai Zhao🇨🇳

   Lightcone distribution amplitudes (LCDAs) of heavy meson within heavy quark effective theory (HQET) are crucial for predicting physical observables in $B$ decays, but unfortunately there is no first-principle result due to severe challenges. After analyzing these challenges, we propose a realistic method to determine heavy meson LCDA. We utilize equal-time correlations and incorporate a dynamic quark field for a fast moving heavy quark. To verify this method, we make use of lattice QCD simulation on a lattice ensemble with spacing $a=0.05187$\,fm. The preliminary findings for HQET LCDAs qualitatively align with phenomenological models, and the fitted result for the first inverse moment ${\lambda }_B^{-1}$ is consistent with the experimentally constrain from $B\to \gamma \ell {\nu }_{\ell }$. We explore how our findings can reduce model uncertainties in predictions of heavy-to-light form factors at large recoil. These results demonstrate the promise of our method in providing first-principle predictions for heavy meson LCDAs.

   hep-phhep-exhep-latPRD(2025)·45 citations
9. 09*

   Model-independent description of $B\to D\pi \ell \nu$ decays

   Erik J. Gustafson🇺🇸 · Florian Herren🇨🇭 · Ruth S. Van de Water🇺🇸 · Raynette van Tonder🇨🇦 · Michael L. Wagman🇺🇸

   In this contribution we present a novel, model-independent description of semileptonic $B\to D\pi \ell \nu$ decays. In addition, we discuss recent developments in the understanding of coupled-channel $D\pi$-$D\eta$-$D_{s}K$ S-wave scattering and, for the first time, apply them to semileptonic decays. We not only obtain model-independent predictions for kinematic distributions in $B\to D\pi \ell \nu$ decays, but also rule out the hypothesis that the gap between the inclusive $B\to X\ell \nu$ branching fraction and the sum over exclusive channels is made up predominantly by $B\to D^{(\ast )}\eta \ell \nu$ decays.

   hep-phhep-exhep-lat0 citations
10. 10*

    A dispersive study of final-state interactions in $K\to \pi \pi \pi$ amplitudes

    Véronique Bernard🇫🇷 · Sébastien Descotes-Genon🇫🇷 · Marc Knecht🇫🇷 · Bachir Moussallam🇫🇷

    A system of dispersive representations of the Omnès-Khuri-Treiman-Sawyer-Wali type for the final-state interactions in the amplitudes of the $K\to \pi \pi \pi$ weak transitions is constructed, under the assumptions that CP and isospin symmetries are conserved. Both the $\Delta I=1/2$ and $\Delta I=3/2$ transition channels are considered. The set of single-variable functions involved in these representations is identified, and the polynomial ambiguities in their definitions are discussed. Numerical solutions for the system of coupled integral relations satisfied by these functions are provided, and the determination of the subtraction constants in terms of the experimental information on the amplitudes in the decay region is addressed.

    hep-phEPJC(2024)·8 citations
11. 11*

    New Physics Pathways from B Processes

    Alessandra D'Alise🇮🇹 · Giuseppe Fabiano🇮🇹 · Domenico Frattulillo🇮🇹 · Davide Iacobacci🇮🇹 · Francesco Sannino🇮🇹 · Pietro Santorelli🇮🇹 · Natascia Vignaroli🇮🇹

    We re-consider recent measures of $R_K$ and $R_{K^{\ast }}$, now compatible with the Standard Model expectations, as well as the results for the process $\text{BR}(B_s\to {\mu }^{+}{\mu }^{-})$ alongside earlier determinations of $R_{D^{(\ast )}}$ and $\text{BR}(B_c\to \tau \nu )$. We provide analytic constraints on the associated Wilson coefficients in both the $b\to s$ and the $b\to c$ sectors. These allow us to estimate the scale of potential New Physics for generic extensions of the Standard Model. We then use the results to constrain the leptoquark landscape.

    hep-phhep-thNPB(2024)·20 citations
12. 12*

    Cosmology of axion dark matter

    Ciaran A. J. O'Hare🇦🇺

    I present an introduction and topical review on axions as a dark matter candidate. Emphasis is placed on issues surrounding the cosmology of axion dark matter that are relevant for present-day searches, including: early-Universe production mechanisms, predictions of the axion mass, bounds on axion properties derived from cosmological data, as well as the direct and indirect detection of relic axion populations.

    hep-phastro-ph.COPoS(2024)·220 citations
13. 13*

    Renormalization of the next-to-leading-power $\gamma \gamma \to h$ and $gg\to h$ soft quark functions

    Martin Beneke🇩🇪 · Yao Ji🇩🇪 · Xing Wang🇩🇪

    We calculate directly in position space the one-loop renormalization kernels of the soft operators $O_{\gamma }$ and $O_g$ that appear in the soft-quark contributions to, respectively, the subleading-power $\gamma \gamma \to h$ and $gg\to h$ form factors mediated by the $b$-quark. We present an IR/rapidity divergence-free definition for $O_g$ and demonstrate that with a correspondent definition of the collinear function, a consistent factorization theorem is recovered. Using conformal symmetry techniques, we establish a relation between the evolution kernels of the leading-twist heavy-light light-ray operator, whose matrix element defines the $B$-meson light-cone distribution amplitude (LCDA), and $O_{\gamma }$ to all orders in perturbation theory. Application of this relation allows us to bootstrap the kernel of $O_{\gamma }$ to the two-loop level. We construct an ansatz for the kernel of $O_g$ at higher orders. We test this ansatz against the consistency requirement at two-loop and find they differ only by a particular constant.

    hep-phJHEP(2024)·14 citations
14. 14*

    Low-energy elastic (anti)neutrino-nucleon scattering in covariant baryon chiral perturbation theory

    Jin-Man Chen🇨🇳 · Ze-Rui Liang🇨🇳 · De-Liang Yao🇨🇳

    The low-energy antineutrino- and neutrino-nucleon neutral current elastic scattering is studied within the framework of the relativistic SU(2) baryon chiral perturbation theory up to the order of $\mathcal{O}(p^3)$. We have derived the model-independent hadronic amplitudes and extracted the form factors from them. It is found that differential cross sections $\mathrm{d}\sigma /\mathrm{d}{Q}^2$ for the processes of (anti)neutrino-proton scattering are in good agreement with the existing MiniBooNE data in the $Q^2$ region $[0.13,0.20]$ GeV${}^2$, where nuclear effects are expected to be negligible. For $Q^2\le 0.13$ GeV${}^2$, large deviation is observed, which is mainly owing to the sizeable Pauli blocking effect. Comparisons with the simulation data produced by the NuWro and GIENE Mento Carlo events generators are also discussed. The chiral results obtained in this work can be utilized as inputs in various nuclear models to achieve the goal of precise determination of the strangeness axial vector form factor, in particular when the low-energy MicroBooNE data are available in the near future.

    hep-phFront.Phys.(Beijing)(2024)·6 citations
15. 15*

    Hidden-charm pentaquark states $qqqc\bar{c}$ $(q=u,d)$ in the chiral SU(3) quark model

    Du Wang🇨🇳 · Wen-Ling Wang🇨🇳 · Fei Huang🇨🇳

    In this work, we systematically calculate the spectrum of hidden-charm pentaquark states $qqqc\bar{c}$ $(q=u,d)$ in the chiral SU(3) quark model, which has been quite successful in reproducing consistently the energies of octet and decuplet baryon ground states, the binding energy of deuteron, and the nucleon-nucleon ($NN$) scattering phase shifts and mixing parameters for partial waves with total angular momentum up to $J=6$. The Hamiltonian contains the one-gluon-exchange (OGE) potential, the Goldstone-boson-exchange (GBE) potential, the confinement potential, and the kinetic energy of the system. We solve the Schrödinger equation by use of the variational method. It is found that the masses of all the experimentally observed $P_c(4312)$, $P_c(4380)$, $P_c(4440)$, and $P_c(4457)$ states are much overestimated, indicating that these states are not compact pentaquark states in the chiral SU(3) quark model. All other $qqqc\bar{c}$ $(q=u,d)$ states are found to lie much above the corresponding baryon-meson thresholds, and thus are not suggested as stable pentaquark states due to their fall-apart decays. A detailed comparison of the results with those obtained in the OGE model and the chromomagnetic interaction (CMI) model is further given.

    hep-phnucl-thPRC(2024)·3 citations
16. 16*

    Probing the shape of the quark-gluon plasma droplet via event-by-event QGP tomography

    Bithika Karmakar🇷🇸 · Dusan Zigic🇷🇸 · Pasi Huovinen🇵🇱 · Marko Djordjevic · Magdalena Djordjevic · Jussi Auvinen🇫🇮

    This study investigates Quark-Gluon Plasma (QGP) in heavy-ion collisions through two avenues: high-$p_{\perp }$ frameworks and hydrodynamic modeling. Using the T${}_{\text{R}}$ENTo model, we find that IP-Glasma mimicking $p=0$ value aligns well with high-$p_{\perp }$ data, in agreement with Bayesian analysis of the low-$p_{\perp }$ regime. While adjusting $p$ values may improve a fit to a particular high-$p_{\perp }$ observable, it does not permit an earlier onset of transverse expansion.

    hep-phnucl-thPRC(2024)·10 citations
17. 17*

    Resonant Multi-Scalar Production in the Generic Complex Singlet Model in the Multi-TeV Region

    Samuel D. Lane🇺🇸 · Ian M. Lewis🇺🇸 · Matthew Sullivan🇺🇸

    We develop benchmarks for resonant di-scalar production in the generic complex singlet scalar extension of the Standard Model (SM), which contains two new scalars. These benchmarks maximize di-scalar resonant production: $pp\to h_2\to h_1{h}_1/h_1{h}_3/h_3{h}_3$, where $h_1$ is the observed SM-like Higgs boson and $h_{2,3}$ are new scalars. The decays $h_2\to h_1{h}_3$ and $h_2\to h_3{h}_3$ may be the only way to discover $h_3$, leading to a discovery of two new scalars at once. Current LHC and projected future collider (HL-LHC, FCC-ee, ILC500) constraints are used to produce benchmarks at the HL-LHC for $h_2$ masses between 250 GeV and 1 TeV and a future $pp$ collider for $h_2$ masses between 250 GeV and 12 TeV. We update the current LHC bounds on the singlet-Higgs boson mixing angle. As the mass of $h_2$ increases, certain limiting behaviors of the maximum rates are uncovered due to theoretical constraints on the parameters. These limits, which can be derived analytically, are $\mathrm{BR}(h_2\to h_1{h}_1)\to 0.25$, $\mathrm{BR}(h_2\to h_3{h}_3)\to 0.5$, and $\mathrm{BR}(h_2\to h_1{h}_3)\to 0$. It can also be shown that the maximum rates of $pp\to h_2\to h_1{h}_1/h_3{h}_3$ approach the same value. Hence, all three $h_2\to h_i{h}_j$ decays are promising discovery modes for $h_2$ masses below $\mathcal{O}(1\mathrm{TeV})$, while above $\mathcal{O}(1\mathrm{TeV})$ the decays $h_2\to h_1{h}_1/h_3{h}_3$ are more encouraging. Masses for $h_3$ are chosen to produce a large range of signatures including multi-b, multi-vector boson, and multi-$h_1$ production. The behavior of the maximum rates imply that in the multi-TeV region this model may be discovered in the Higgs quartet production mode before Higgs triple production is observed. The maximum di- and four Higgs production rates are similar in the multi-TeV range.

    hep-phPRD(2024)·20 citations
18. 18*

    Natural Metric-Affine Inflation

    Antonio Racioppi🇪🇪 · Alberto Salvio🇮🇹

    We consider here natural inflation in the low energy (two-derivative) metric-affine theory containing only the minimal degrees of freedom in the inflationary sector, i.e. the massless graviton and the pseudo-Nambu-Goldstone boson (PNGB). This theory contains the Ricci-like and parity-odd Holst invariants together with non-minimal couplings between the PNGB and the above-mentioned invariants. The Palatini and Einstein-Cartan realizations of natural inflation are particular cases of our construction. Explicit models of this type featuring non-minimal couplings are shown to emerge from the microscopic dynamics of a QCD-like theory with an either sub-Planckian or trans-Planckian confining scale and that is renormalizable on Minkowski spacetime. Moreover, for these models, we find regions of the parameter space where the inflationary predictions agree with the most recent observations at the $2\sigma$ level. We find that in order to enter the $1\sigma$ region it is necessary (and sufficient) to have a finite value of the Barbero-Immirzi parameter and a sizable non-minimal coupling between the inflaton and the Holst invariant (with sign opposite to the Barbero-Immirzi parameter). Indeed, in this case the potential of the canonically normalized inflaton develops a plateau as shown analytically.

    hep-phastro-ph.COgr-qchep-thJCAP(2024)·32 citations
19. 19*

    Target normal single-spin asymmetry in inclusive electron-nucleon scattering in the 1/Nc expansion

    Jose L. Goity🇺🇸 · Christian Weiss🇺🇸

    The target normal single-spin asymmetry in electron nucleon scattering is studied in the framework of the 1/Nc expansion of QCD, which allows for a rigorous description in the energy range that includes the Delta resonance and below the second baryon resonance region. The asymmetry is driven by the absorptive part of the two-photon exchange component of the scattering amplitude, being therefore the most unambiguous two-photon exchange effect. Such amplitude is shown to be described up to the next to leading order in the 1/Nc expansion only in terms of the charge and magnetic form factors of the nucleons, consequence of the approximate $SU(4)$ spin flavor symmetry valid in the large Nc limit for baryons. A discussion is provided of the 1/Nc expansion framework along with the results for the asymmetries in elastic, inelastic, and inclusive electron-nucleon scattering.

    hep-phnucl-th0 citations
20. 20*

    Loop Quantum Gravity effects on electromagnetic properties of charged leptons

    João Paulo S. Melo🇧🇷 · Mario J. Neves🇧🇷 · Jefferson M. A. Paixão🇧🇷 · José A. Helayël-Neto🇧🇷

    The efforts in this contribution consist in reassessing a modified Dirac equation that incorporates a ${\gamma }^0{\gamma }_5$-Lorentz-symmetry violating (LSV) term induced as a Loop Quantum Gravity (LQG) effect. Originally, this equation has been applied and considered as a good scenario for describing a number of investigations on the flight time of cosmic neutrinos, which suggests that the speed, in vacuum, in connection with the geometry that describes a granular space-time, takes the energy-dependent form, e.g., $v(E)=1\pm E/E_{\text{LSV}}$, with $E_{\text{LSV}}\approx 6,5\times 10^{17}$ GeV for neutrinos. Once LQG provides a viable way to understand this picture consistently, we pursue an analysis of this effective Dirac equation to inspect some of its properties. These include: the derivation of the modified fermionic propagator, attainment of the Gordon decomposition of the vector current with minimal electromagnetic coupling to obtain information on the form factors, examination of the non-relativistic limit of the equation, evaluation of the spin- and velocity-dependent corrections to the Coulomb potential due to LQG effects, and the modified Hamiltonian in the low-relativistic regime. The study of the form factors may open up paths to set up bounds on the LQG parameters from the precision measurements of electromagnetic attributes of the charged leptons, such as their respective electric and magnetic dipole moments.

    ↳ hep-thhep-phEPJC(2024)·12 citations
21. 21*

    Robust integration of fast flavor conversions in classical neutrino transport

    Zewei Xiong🇩🇪 · Meng-Ru Wu🇹🇼 · Manu George🇹🇼 · Chun-Yu Lin🇹🇼

    The quantum kinetic evolution of neutrinos in dense environments, such as the core-collapse supernovae or the neutron star mergers, can result in fast flavor conversion (FFC), presenting a significant challenge to achieving robust astrophysical modeling of these systems. Recent works that directly simulate the quantum kinetic transport of neutrinos in localized domains have suggested that the asymptotic outcome of FFCs can be modeled by simple analytical prescriptions when coarse grained over a size much larger than the FFC length scale. In this Letter, by leveraging such a scale separation, we incorporate the analytical prescriptions into global simulations that solve the classical neutrino transport equation including collisions and advection under spherical symmetry. We demonstrate that taking this approach allows to obtain results that quantitatively agree with those directly from the corresponding global quantum kinetic simulations and precisely capture the collisional feedback effect for cases where the FFC happens inside the neutrinosphere. Notably, the effective scheme does not require resolving the FFC time and length scales, hence only adds negligible computational overhead to classical transport. Our work highlights that efficient and robust integration of FFCs in classical neutrino transport used in astrophysical simulation can be feasible.

    ↳ astro-ph.HEhep-phPRL(2025)·47 citations
22. 22*

    Hairy black holes in extended Einstein-Maxwell-scalar theories with magnetic charge and kinetic couplings

    Kitaro Taniguchi🇯🇵 · Shinta Takagishi · Ryotaro Kase🇯🇵

    We study black hole (BH) solutions in extended Einstein-Maxwell-scalar theories, which are classified in a subclass of the $U(1)$ gauge-invariant scalar-vector-tensor theories. The scalar field is coupled to the vector field, which has electric and magnetic charges. For the static and spherically symmetric spacetime, we investigate modifications to the Reissner-Nordström solutions focusing on the three types of scalar-vector interactions, including derivative couplings. We solve the field equations analytically in two asymptotic regions which are the vicinity of the BH horizon and the spatial infinity, and clarify the condition for the existence of scalar hair. To understand the behaviors of solutions in intermediate scales, the field equations are integrated numerically for concrete models with different types of couplings. We find new hairy BH solutions with scalar hair in the presence of magnetic charge and kinetic coupling. The magnetic charge plays an important role in distinguishing hairy BH solutions originated from three types of different interactions at a large coupling limit.

    ↳ gr-qchep-phhep-thPRD(2024)·4 citations
23. 23*

    Symmetry restoration and vacuum decay from accretion around black holes

    James Marsden · Josu C. Aurrekoetxea🇬🇧 · Katy Clough🇬🇧 · Pedro G. Ferreira🇬🇧

    Vacuum decay and symmetry breaking play an important role in the fundamental structure of the matter and the evolution of the universe. In this work we study how the purely classical effect of accretion of fundamental fields onto black holes can lead to shells of symmetry restoration in the midst of a symmetry broken phase. We also show how it can catalyze vacuum decay, forming a bubble that expands asymptotically at the speed of light. These effects offer an alternative, purely classical mechanism to quantum tunnelling for seeding phase transitions in the universe.

    ↳ gr-qcastro-ph.COhep-phPRD(2025)·3 citations
24. 24*

    Linear dynamics and classical tests of the gravitational quantum field theory

    Yuan-Kun Gao🇨🇳 · Da Huang🇨🇳 · Yong-Liang Ma🇨🇳 · Yong Tang🇨🇳 · Yue-Liang Wu🇨🇳 · Yu-Feng Zhou🇨🇳

    We explore the new physics phenomena of gravidynamics governed by the inhomogeneous spin gauge symmetry based on the gravitational quantum field theory. Such a gravidynamics enables us to derive the generalized Einstein equation and an equation beyond it. To simplify the analyses, we linearize the dynamic equations of gravitational interaction by keeping terms up to the leading order in the dual gravigauge field. We then apply the linearized dynamic equations into two particular gravitational phenomena. First, we consider the linearized equations in the absence of source fields, which is shown to have five physical propagating polarizations as gravitational waves, i.e., two tensor modes, two vector modes, and one scalar, instead of two tensor polarizations in the general relativity. Second, we examine the Newtonian limit in which the gravitational fields and the matter source distribution are weak and static. By deriving the associated Poisson equation, we obtain the exact relation of the fundamental interaction coupling in the gravidynamics with the experimentally measured Newtonian constant. We also make use of nonrelativistic objects and relativistic photons to probe the Newtonian field configurations. In particular, the experiments from the gravitational deflection of light rays and the Shapiro time delay can place stringent constraints on the linearized gravidynamics in the gravitational quantum field theory.

    ↳ gr-qchep-phhep-thPRD(2024)·11 citations
25. 25*

    Nuclear matrix elements of neutrinoless double-beta decay in covariant density functional theory with different mechanisms

    C. R. Ding🇨🇳 · Gang Li🇨🇳 · J. M. Yao🇨🇳

    Nuclear matrix elements (NMEs) for neutrinoless double-beta ($0\nu \beta \beta$) decay in candidate nuclei play a crucial role in interpreting results from current experiments and in designing future ones. Accurate NME values serve as important nuclear inputs for constraining parameters in new physics, such as neutrino mass and the Wilson coefficients of lepton-number-violating (LNV) operators. In this study, we present a comprehensive calculation of NMEs for $0\nu \beta \beta$ decay in ${}^{76}$Ge, ${}^{82}$Se, ${}^{100}$Mo, ${}^{130}$Te, and ${}^{136}$Xe, using nuclear wave functions obtained from multi-reference covariant density functional theory (MR-CDFT). We employ three types of transition potentials at the leading order in chiral effective field theory. Our results, along with recent data, are utilized to constrain the coefficients of LNV operators. The results demonstrate that the combined NMEs based on the Feynman diagrams at the hadronic scale for the nonstandard mechanisms lead to uncertainty by different nuclear models comparable to that for the standard mechanism. The use of NMEs from various nuclear models does not dramatically change the parameter space intervals for the coefficients, although MR-CDFT yields the most stringent constraint. Furthermore, our NMEs can also be used to perform a more comprehensive analysis with multiple isotopes.

    ↳ nucl-thhep-phnucl-exPLB(2024)·7 citations
26. 26*

    Searching for large dark matter clumps using the Galileo Satnav clock variations

    Bruno Bertrand🇧🇪 · Pascale Defraigne🇧🇪 · Aurélien Hees🇫🇷 · Alexandra Sheremet🇫🇷 · Clément Courde🇫🇷 · Julien Chabé🇫🇷 · Javier Ventura-Traveset🇫🇷 · Florian Dilssner🇩🇪 · Erik Schoenemann🇩🇪 · Luis Mendes🇫🇷 · Pacôme Delva🇫🇷

    This study presents bounds on transient variations of fundamental constants, with typical timescales ranging from minutes to months, using clocks in space. The underlying phenomenology describing such transient variations relies on models for Dark Matter (DM) which suggest possible encounters of macroscopic compact objects with the Earth, due to the motion of the solar system in the galactic halo. If such compact objects possess an effective feeble interaction with the ordinary matter beyond the gravitational one, it may result in effective transient variations of fundamental constants. Such variations leave signatures on clocks onboard GNSS satellites. In this paper, we introduce a phenomenological study dedicated to the search for such DM transient objects using the network of passive hydrogen masers (H-Masers) onboard Galileo satellites. We first model the signature of transient variations of fundamental constants as a frequency modulation in the difference between two satellite clocks, considering the satellite trajectories relative to the transient event. Then, we present first results based on a fast analysis method, the maximum reach analysis. The main result is a significant extension of the discovery range for DM transients, with a sensitivity never achieved before. We investigate indeed the range of transient sizes from $10^5$ to $10^9$ kilometres, which, apart from indirect and model-dependent non-transient effects, has never been explored previously.

    ↳ astro-ph.COgr-qchep-phphysics.atom-phAdv.Space Res.(2024)·0 citations
27. 27*

    A new SU(2/1) supergroup with determinant 1 explains many mysteries of the weak interactions

    Jean Thierry-Mieg

    Taken as a classification paradigm completing the standard model, a new compact form of the SU(2/1) supergroup explains many mysterious properties of the weak interactions: the maximal breaking of parity, the fractional charges of the quarks, the cancellation of the quantum field theory anomalies, and ties together the existence of the right neutrinos and of the heavier Fermions. This compact supergroup is constructed by exponentiating the matrices representing the leptons and the quarks which form a semi-direct sum of Kac modules of the real superalgebra su(2/1,R) such that the overall trace of the $U(1)$ weak-hypercharge $Y$ vanishes. Remarkably, all the elements of this supergroup have Berezinian 1 and determinant 1. In practice, $Tr(Y)=0$ simply means that the electric charge of the hydrogen atom is zero.

    ↳ hep-thhep-ph0 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.