Mon·Nov 17, 2025Monday·November 17, 2025

1. 01*

   Simplified Spin Dependence in Dark Matter Direct Detection

   Pierce Giffin🇺🇸 · Benjamin Lillard🇺🇸 · Pankaj Munbodh🇺🇸 · Tien-Tien Yu🇺🇸

   The interactions of dark matter with Standard Model particles can be systematically studied in the language of effective field theories. We investigate dark matter interactions with Standard Model particles, including spin-dependent interactions, for direct detection experiments and demonstrate that, although the scattering rate generally depends on multiple types of material response functions, certain linear combinations of these material response functions vanish if the initial and final electronic states share the same Hamiltonian. We also find that several other response functions vanish in parity-symmetric materials, making these systems as simple as isotropic detectors in some respects. Finally, we present the scattering rate for an anisotropic, possibly chiral detector, for generic dark matter-electron spin interactions. These relations reduce the number of independent response functions needed, thereby simplifying the computational complexity for a broad class of dark matter models. Our results provide a complete and efficient toolkit for analyzing electron recoil signals in diverse detector materials.

   hep-phhep-thPRD(2026)·8 citations
2. 02*

   Pseudoscalar meson mass relations from a second-order phase transition

   R. L. P. G. Amaral🇧🇷 · V. E. R. Lemes🇧🇷 · O. S. Ventura🇧🇷 · L.C.Q.Vilar🇧🇷

   This work is divided in two parts. The first three sections review meson physics phenomenology, highlighting the history of pseudoscalar multiplet mass spectra research. We then propose a new approach for the mass mixing problem based exclusively on a second order phase transition principle. This development leads to new relations among the masses of the mesons in this nonet, which present a nice agreement with measurements. The quark constitutions and the mixing angle problem are also correctly addressed. After describing the spontaneous symmetry breaking process coming from this phenomenological analysis, we establish a field theory with the necessary elements that could reproduce theoretically such results. This is done in the second part of this work, where the one-loop quantum corrections are computed in full, with the cubic and quartic scalar vertices treated on the same footing. The resulting mass Lagrangian has a universal flavor structure, which forces a refined identification between the scalar components and the ${\eta }^0$--${\eta }^{\prime 0}$ states; we derive the general matching condition and present its minimal solution, which reproduces the phenomenological mixing matrix exactly. Combined with the gap equation of the scalar sector, the model is left with a single free coupling, which does not affect the mass predictions. We emphasize that this is a phenomenological model constructed to reproduce certain mass relations, not a first-principles derivation from QCD. Nevertheless, as we will show, the model's predictions for the pseudoscalar meson masses agree remarkably well with the observed QCD spectrum.

   hep-phhep-th0 citations
3. 03*

   Top-quark production cross sections at higher perturbative orders

   Nikolaos Kidonakis🇺🇸

   I present calculations of higher-order corrections to top-quark production via three different processes: the production of a top-antitop pair and a $Z$ boson; single-top quark production in the $s$-channel; and top-antitop production with a Higgs boson. It is shown that the contributions from soft-gluon corrections are numerically dominant and large in all these processes. I present approximate NNLO (aNNLO) and approximate N${}^3$LO (aN${}^3$LO) cross sections that include soft-gluon corrections added to the exact NLO QCD results. Electroweak corrections through NLO are also included for $t\bar{t}Z$ and $t\bar{t}H$ production. The theoretical predictions are compared to LHC measurements of total cross sections for these processes.

   hep-ph0 citations
4. 04*

   Valence quark distribution of rho meson using light-front quark model

   Satyajit Puhan🇮🇳 · Shubham Sharma🇷🇺 · Narinder Kumar🇮🇳 · Harleen Dahiya🇮🇳

   We investigate the partonic structure of the $\rho$ meson, the lightest spin-$1$ vector meson, within the light-front quark model (LFQM). To explore the sensitivity to model assumptions, we employ two distinct types of spin wave functions in the LFQM. Using light-front helicity wave functions, we derive explicit expressions for the leading-twist and subleading-twist quark parton distribution functions (PDFs), and evolve the leading-twist PDFs to higher scales with next-to-leading order (NLO) Dokshitzer--Gribov--Lipatov--Altarelli--Parisi (DGLAP) evolution. We have also calculated the Mellin moment from the evolved PDFs using a simple neural network frame and compared with available theoretical predictions. Furthermore, we compute the full set of nine leading-twist transverse-momentum-dependent distributions (TMDs) for the valence quark in the $\rho$ meson, including three tensor TMDs that arise from spin-$1$ tensor polarization of the hadron. Positivity constraints for the PDFs and TMDs are examined within this framework. Our findings highlight the crucial role of tensor polarization in shaping the three-dimensional partonic structure of vector mesons.

   hep-phPRD(2026)·5 citations
5. 05*

   Spin-averaged $B_c$ Spectrum in a Cornell-type Potential Using VMC Baseline and GFMC Evolution

   Tarik Akan🇹🇷

   In this work, the spin-averaged $B_c$ spectrum is computed in a naive Cornell framework, treating the meson as a nonrelativistic system in a spin-independent potential. The Cornell parameters are calibrated directly to the spin-averaged $B_c$ tower by anchoring the $1S$ centroid and scanning a grid in $(\sigma ,\kappa )$, with the additive constant $V_0$ fixed at each point by the experimental ground state mass. The spectrum is obtained with a two stage Monte Carlo approach. Variational Monte Carlo (VMC) provides optimized radial trial states with the desired nodal pattern. Fixed node Green's function Monte Carlo (GFMC) then projects the corresponding ground state energies for each $(n,\ell )$ channel. Controlled scans over the GFMC time step, projection time, walker population, and radial grid identify plateau regions where discretization and projection systematics are quantitatively under control. At a representative best point in the low-RMSE valley, the predicted spin-averaged masses agree with the experimental centroids at the level of a few tens of MeV, and the fitted Cornell parameters are consistent with canonical heavy quarkonium analyses.

   hep-ph3 citations
6. 06*

   Exclusive semileptonic $B$ decays to the ground and excited states of light mesons

   V.O. Galkin🇷🇺 · Xian-Wei Kang🇨🇳

   Exclusive semileptonic decays of $B$ mesons to the ground, radially and orbitally excited states of light mesons are investigated in the framework of the relativistic quark model based on the quasipotential approach. Such decays are very important for the determination of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{ub}|$ and testing the nature of the excited light mesons. The mixing schemes for the isoscalar light mesons are considered. The possible assignment of the experimentally observed excited light mesons to the particular states is discussed. The form factors parameterizing weak decay matrix elements between the initial $B$ meson and final light mesons are calculated with the complete account of the relativistic effects, including contributions of the intermediate negative energy states and relativistic transformations of the meson wave functions from rest to the moving reference frame. As a result the transferred momentum squared, $q^2$, dependence of the form factors is explicitly determined in the whole accessible kinematical range. On the basis of the helicity formalism the decay branching fractions and asymmetry and polarization parameters are calculated. The obtained results for the semileptonic $B$ decays to the ground states of light mesons are confronted with available experimental data. On this basis the value of the $|V_{ub}|$ matrix element is determined. It is found in good agreement with the value extracted from inclusive decays. Predictions for the branching fractions of the semileptonic $B$ decays to radially ($2S$ and $3S$) and orbitally ($1P$ and $2P$) excited light mesons are given. Comparison with the previous calculations is performed. It is found that several decays to the excited light mesons have branching fractions of the order $10^{-4}$ and, thus, they can be measured at existing and future $B$ factories.

   hep-phhep-exPRD(2026)·0 citations
7. 07*

   Thermal Leptogenesis in $SO(10)\times U(1{)}_A$ SUSY GUT

   Nobuhiro Maekawa🇯🇵 · Kei Shibata🇯🇵 · Masato Yamanaka🇯🇵

   We investigate thermal leptogenesis within a supersymmetric grand unified theory (SUSY GUT) based on the $SO(10)\times U(1{)}_A$ symmetry, where both the doublet--triplet splitting problem and the unrealistic Yukawa relations are resolved under the natural assumption that all symmetry-allowed interactions appear with $\mathcal{O}(1)$ coefficients. In this framework, the structures of the Dirac neutrino Yukawa couplings and right-handed neutrino masses are determined entirely by the symmetry. The baryon asymmetry of the Universe is computed taking into account the flavor effects, Higgs asymmetry contributions, and the impact of the second-lightest right-handed neutrino. While the predicted asymmetry is too small when all $\mathcal{O}(1)$ coefficients of the Dirac neutrino Yukawa couplings are set to unity, a moderate enhancement factor $r_1\sim 5.4$ for the lightest right-handed neutrino mass reproduces the observed baryon asymmetry without spoiling low-energy neutrino data. This corresponds to a suppressed lightest neutrino mass, $m_{{\nu }_1}\sim (1/r_1)\times (\text{symmetry-determined value})$, typically $m_{{\nu }_1}\sim 4.5\times 10^{-4}\text{eV}$. We further explore cases where the $\mathcal{O}(1)$ coefficients of the Dirac neutrino Yukawa couplings are $\pm 1$, and find that roughly half of them successfully generate the observed baryon asymmetry for $r_1\le 11$. Moreover, the others yield results of the correct order of magnitude, although they do not generate the observed Baryon asymmetry. These findings demonstrate that thermal leptogenesis is realized in this $SO(10)\times U(1{)}_A$ SUSY GUT, establishing a link between the observed baryon asymmetry and predictions for the lightest neutrino mass.

   hep-phgr-qcJHEP(2026)·0 citations
8. 08*

   Dark Matter Capture in Supernovae Modifies Dark Photon Cooling Bounds

   Aritra Gupta🇮🇳 · Manibrata Sen🇮🇳

   Core-collapse supernovae serve as powerful probes of light, weakly coupled particles, such as dark photons. The conventional SN1987A cooling bound constrains the dark photon mass-mixing parameter space by requiring that the luminosity from the proto-neutron star core not exceed the observed neutrino emission. In this work, we revisit these limits by including the effect of dark matter (DM) captured inside the progenitor star before collapse. The trapped DM acts as an additional scattering target for dark photons, modifying their free-streaming length and, consequently, the supernova cooling rate. We perform a self-consistent analysis for both annihilating and asymmetric DM scenarios, incorporating light-mediator effects in the capture rate calculation. For annihilating DM, the equilibrium density remains too small to affect the bounds significantly. In contrast, asymmetric DM can accumulate to large densities, leading to the formation of a "dark photosphere" that suppresses the dark-photon luminosity and reopens regions of parameter space previously excluded by supernova cooling. The results presented are intended as a proof-of-principle demonstration of how astrophysical dark matter populations can alter supernova cooling constraints and do not provide precision exclusion limits on any given model.

   hep-phastro-ph.COEPJC(2026)·3 citations
9. 09*

   Toward a holographic realization of the 2+1-flavor QCD phase structure

   Jin-Yang Shen🇨🇳 · Xin-Yi Liu🇨🇳 · Jin-Rui Wu🇨🇳 · Yue-Liang Wu🇨🇳 · Zhen Fang🇨🇳

   We present a fully back-reacted Einstein--Maxwell--Dilaton--flavor model with dynamical light and strange sectors, calibrated to lattice QCD using a machine-learning--assisted spectral method. The model reproduces the 2+1-flavor equation of state and chiral dynamics with quantitative accuracy, and maps the Columbia plot with a tri-critical point at $m_s^{\mathrm{tri}}\simeq 21\text{MeV}$ and a critical mass $m_c\simeq 0.785\text{MeV}$, consistent with lattice results. At finite density, it yields a crossover-to-first-order transition and predicts a critical endpoint at $T_C=75.4\text{MeV}$ and ${\mu }_C=768\text{MeV}$, within the reach of heavy-ion experiments. These findings establish a unified holographic framework for the QCD phase structure across quark masses and baryon density, providing the first consistent and quantitative description of both deconfinement and chiral transitions within a single holographic model.

   hep-phPRD(2025)·6 citations
10. 10*

    Weak decays of Bc meson in a QCD potential model

    K K Pathak🇮🇳 · S Bhattacharya🇮🇳 · T Das🇮🇳

    The leptonic and semileptonic decay propertis of Bc mesons are studied in a QCD potential model. The CKM element for the leptonic decay is calculated by evaluating its decay constant. With the help of the Isgur-Wise function, the form factors and the CKM element for semileptonic decay are also calculated. The variation in four-momentum square in the two decays demands two different scales of the strong coupling constant \alpha_s. Thus, a two-scale picture is evident from the study. We compute the decay constant f_p for leptonic decay and form factors for semileptonic decay with two different \alpbda scales in a specific prescription where it is related to the strong coupling \alpha_s. Within the potential model, we find the scale for leptonic decay is \lambda \le 0.150 GeV and for semileptonic decay is \lamda \ge 0.410 GeV.

    hep-phIndian J.Phys.(2023)·1 citation
11. 11*

    An EFT approach to the study of multi-phase criticality scenarios

    Kristjan Kannike🇪🇪 · Luca Marzola🇪🇪 · Kristjan Müürsepp🇪🇪

    Multi-phase critical scenarios explain the observed Higgs boson mass scale by the almost simultaneous occurrence of two smoothly connected phases of the theory, which differ by the selected vacuum configuration. A generic prediction of the framework is the presence of a further light scalar state, the dilaton, which naturally couples weakly to the Higgs boson. The implementation of the framework usually requires the presence of a third, heavier state, which plays the role of dark matter and ensures the couplings run so that the multi-phase criticality condition is met. In this paper we consider the multi-phase criticality limit of an extension of the Standard Model including two extra scalar singlets, addressing the scenario with effective field theory methods that are particularly suited for treating the hierarchical mass spectrum that this construction yields. The analysis improves on the approximated results available in the Literature and explores the phenomenology of the model at collider and dark matter experiments. We find that the running of scalar couplings in the EFT between the two scales cannot be ignored, but the quantum corrections from the dark matter candidate are not noticeably modified.

    hep-ph1 citation
12. 12*

    Effects of Early-Universe Inhomogeneity on Bubble Formation: Primordial Black Holes as an Extreme Case

    Yijie Chang · Shihang Tang🇨🇳 · Haowen Deng · Yefeng Wang🇨🇳 · Ran Ding · Fa Peng Huang🇨🇳

    Our early Universe is not perfectly homogeneous and it may contain some inhomogeneous sources, which might distort the local spacetime and modify the bubble nucleation rate. Taking the primordial black hole as an extreme example, we investigate the bubble nucleation rate of a first-order phase transition in the vicinity of primordial black holes or other primordial gravitational sources. Our analysis reveals that the presence of primordial black holes can reduce the effective action and might modify the nucleation rate due to their gravitational effects, potentially altering the dynamics of the phase transition in the early universe and producing new gravitational wave signals since the gravitational effects of the primordial black hole or other possible inhomogeneous sources could lead to nucleation of non-spherical symmetric bubbles.

    hep-ph2 citations
13. 13*

    Double virtual QCD corrections to $t\bar{t}+$jet production at the LHC

    Simon Badger🇮🇹 · Matteo Becchetti🇮🇹 · Colomba Brancaccio🇮🇹 · Michał Czakon🇩🇪 · Heribertus Bayu Hartanto🇰🇷 · Rene Poncelet🇵🇱 · Simone Zoia🇨🇭

    We present a leading colour computation of the double virtual contributions to top-quark pair production in association with a jet at a hadron collider at next-to-next-to-leading order in QCD. The finite remainders of the two-loop amplitudes, after subtraction of infrared and ultraviolet divergences, are extracted analytically from evaluations over finite fields by using a (potentially) overcomplete basis of special functions defined through their differential equations. We construct the colour- and spin-summed interference with the tree-level amplitudes and present a \texttt{C++} library suitable for immediate use in phenomenological studies. We present new techniques for the evaluation of the special functions through direct numerical integration of differential equations which perform well across the full physical phase space.

    hep-phJHEP(2026)·15 citations
14. 14*

    Higher-order QCD corrections to top-quark pair production in association with a jet

    Simon Badger🇮🇹 · Matteo Becchetti🇮🇹 · Colomba Brancaccio🇮🇹 · Michal Czakon🇩🇪 · Heribertus Bayu Hartanto🇰🇷 · Rene Poncelet🇵🇱 · Simone Zoia🇨🇭

    The production of a top-quark pair, the heaviest known elementary particle, in association with a light jet is a key process for studying the properties of the Standard Model of Particle Physics. Due to its significance as a signal process with considerable sensitivity to the top-quark mass and as a background process for new physics searches, it is crucial to predict differential cross sections with high precision. In this article, we present, for the first time, predictions for various kinematical observables at next-to-next-to-leading order in Quantum Chromodynamics. The perturbative behavior is analyzed, and uncertainties arising from missing higher-order contributions are substantially reduced. The necessary two-loop amplitudes have been evaluated in the leading-color approximation, and we provide estimates for the impact of the missing contributions.

    hep-phhep-exPRL(2026)·9 citations
15. 15*

    Exclusive photoproduction of a ${\pi }^0\gamma$ pair in the saturation framework

    Michael Fucilla🇫🇷 · Saad Nabeebaccus🇫🇷 · Lech Szymanowski🇵🇱 · Samuel Wallon🇫🇷 · Joseph Yarwick🇫🇷

    We consider the exclusive photoproduction of a ${\pi }^0\gamma$ pair with large invariant mass, as a promising channel to study the effects of gluon saturation. It has recently been demonstrated that this process is incompatible with a collinear factorization approach in terms of generalized parton distributions (GPDs) at the leading twist. In such a situation, a (generalized) $k_T$-dependent factorization at small $x$ is a valid alternative approach. We perform this calculation using the shockwave formalism, which resums multiple gluon exchanges between the projectile and the dense nuclear target. We find that the polarized amplitude changes sign as a function of back-to-back transverse momentum $|{\vec{p}}_t|$ of the pion-photon pair, resulting in a dip-like structure in the fully differential cross section as a function of $|{\vec{p}}_t|$.

    hep-phhep-exnucl-exnucl-th2 citations
16. 16*

    Two-loop all-plus helicity amplitudes for self-dual Higgs boson with gluons via unitarity cut constraints

    Simon Badger🇮🇹 · Christian Biello🇨🇭 · Colomba Brancaccio🇮🇹 · Federico Ripani🇮🇹

    We present the two-loop amplitudes for a self-dual Higgs boson with up to four positive helicity gluons in the heavy top-quark limit. Because the tree amplitudes in the all-plus sector vanish, we can construct simple representations of the polylogarithmic parts of the two-loop amplitudes using four-dimensional unitarity cuts into rational one-loop and tree amplitudes. The remaining rational function ambiguity is extracted from a tensor integral reduction over finite fields. The final expressions are presented using polylogarithms up to weight two and compact rational functions of spinor-helicity products.

    hep-phhep-thJHEP(2026)·5 citations
17. 17*

    Divergences in the hadronic light-by-light amplitude of the holographic soft-wall model

    Josef Leutgeb🇦🇹 · Jonas Mager🇦🇹 · Anton Rebhan🇦🇹

    We use the Wentzel-Kramers-Brillouin (WKB) approximation to uncover divergences and instances of non-commuting limits in a large class of holographic soft-wall models. We show that the infinite sum over single resonance contributions for a variety of observables involving the Chern-Simons term, such as the vector-vector-axial (VVA) correlator or the hadronic light-by-light tensor, does not converge. These divergences can in some cases (such as the VVA correlator) be traced back to non-commuting limits and avoided by working directly in the 5-dimensional setup with bulk-to-boundary propagators. However, the hadronic light-by-light scattering tensor also diverges in the 5-dimensional formulation with corresponding Green functions, preventing a correct implementation of the Melnikov-Vainshtein short-distance constraint and even leading to an infinite contribution to the muon $g-2$. We also discuss modifications of the standard soft-wall model that are able to resolve this issue.

    hep-phhep-thPRD(2026)·5 citations
18. 18*

    The one-jettiness distribution contains super-super-leading logarithms

    Andrea Banfi🇬🇧 · Jeffrey R. Forshaw🇬🇧 · Jack Holguin🇬🇧

    We show that one-jettiness (${\tau }_1$) in colour-singlet plus jet production suffers from super-leading logarithms starting at order ${\alpha }_{\mathrm{s}}^4\ln (1/{\tau }_1{)}^6$ relative to the Born level. This is one logarithm more dominant than any previously identified super-leading logarithms. The extra logarithm is not associated with additional poles, and is therefore consistent with the factorization of universal parton distribution functions at scale ${\tau }_{1}Q$, where $Q$ is the hard scale.

    hep-phPRL(2026)·12 citations
19. 19*

    First bounds on effective muon interactions using the NA64$\mu$ experiment at CERN

    Paolo Crivelli🇨🇭 · Josu Hernandez-Garcia🇪🇸 · Jacobo Lopez-Pavon🇪🇸 · Victor Martin Lozano🇪🇸 · Laura Molina Bueno🇪🇸

    We analyze how NA64$\mu$ can contribute to the global SMEFT program demonstrating that it can probe two effective four lepton operators completely unbounded so far and break one of the current flat directions. Furthermore, we also study an extension of SMEFT that includes fermion singlets of the SM gauge group in the low energy field content. This effective field theory, usually dubbed $\nu$SMEFT, is well motivated by the observation of light neutrino masses and leptonic mixing. We find that NA64$\mu$ can constrain three unbounded four fermion operators of the $\nu$SMEFT. We derive the current leading bounds on these operators and compute the future sensitivity. Our results fill the gap between the current experimental program and a possible future muon collider able to probe this type of New Physics.

    hep-phJHEP(2026)·3 citations
20. 20*

    Jeans Model for the Shapes of Self-interacting Dark Matter Halos

    Yilber Fabian Bautista🇫🇷 · Andrew Robertson🇺🇸 · Laura Sagunski🇩🇪 · Adam Smith-Orlik🇨🇦 · Sean Tulin🇨🇦

    The Jeans model is a semi-analytical approach to modeling self-interacting dark matter (SIDM) that works remarkably well to reproduce the spherically-averaged halo profiles from observations and simulations of relaxed galaxies and galaxy clusters. However, SIDM halos are not spherically symmetric in general since they respond to nonspherical baryon distributions and retain nonsphericity from their initial collapse. In this work, we generalize the Jeans model to describe SIDM density profiles and halo shapes beyond spherical symmetry. Observational tests via halo shapes are especially important for testing SIDM in massive galaxies, $M_{200}\sim 10^{12}-10^{13}\text{Msun}$, where SIDM and collisionless dark matter halos can have indistinguishable spherically-averaged profiles but distinct halo shapes. We validate our model by comparing to cosmological simulations with baryons for both SIDM with $\text{sigmam}=1\text{cmg}$ and collisionless cold dark matter. Our approach differs from previous work in this direction, taking into account the fact that multiple scatterings are required to impact the shape of the halo, as well as being computationally inexpensive to implement. The nonspherical Jeans model can be used in conjunction with halo shape observations (e.g., from gravitational lensing or X-ray data) to directly constrain dark matter self-interactions.

    ↳ astro-ph.COhep-phPRD(2026)·3 citations
21. 21*

    Algebraic Consistency and Explicit Construction of One-Loop BCJ Numerators of Yang-Mills and Related Theories

    Yi-Jian Du🇨🇳 · Chih-Hao Fu🇨🇳 · Yihong Wang🇨🇳 · Chongsi Xie🇨🇳

    We study the algebraic structure of one-loop BCJ numerators in Yang-Mills and related theories. Starting from the propagator matrix that connects colour-ordered integrands to numerators, we identify the consistency conditions that ensure the existence of Jacobi-satisfying numerator solutions and determine the unique construction. The relation between one-loop numerators and forward-limit tree numerators is clarified, together with the additional physical conditions required for a consistent double-copy interpretation. We propose a two-step expansion strategy for obtaining explicit one-loop numerators. The Yang-Mills integrand is first decomposed into scalar-loop Yang-Mills-scalar building blocks, which are then expanded into bi-adjoint scalar integrands. We derive explicit results for up to three external gluons, showing how the kinematic consistency conditions uniquely determine the coefficients in each case. Similar results for Einstein-Yang-Mills and gravity amplitudes are also presented.

    ↳ hep-thhep-phPRD(2026)·4 citations
22. 22*

    Generalizing quantum dimensions: Symmetry-based classification of local pseudo-Hermitian systems and the corresponding domain walls

    Yoshiki Fukusumi🇹🇼 · Taishi Kawamoto

    We study conformal field theories (CFTs) and their classifications from a modern perspective based on the abstract algebraic formalism of symmetries or conserved charges, known as symmetry topological field theories (SymTFTs). By studying the algebraic structure of the SymTFTs in detail, we found a natural generalization of the quantum dimensions associated with (pseudo-)Hermitian systems and (non)-unitary CFTs. These generalized data of SymTFTs provide classifications of massless and massive renormalization group flows, which will describe the quantum phase transitions of the corresponding pseudo-Hermitian systems. Moreover, our discussions straightforwardly enable one to relate a general class of coset constructions or level-rank dualities to domain wall problems between topological quantum field theories (or a series of corresponding quantum phase transitions related to the Higgs mechanism). Our work provides a systematic reduction and classification of algebraic data, symmetries, for pseudo-Hermitian systems based on ideas from established mathematical fields, linear algebra and ring theory.

    ↳ hep-thcond-mat.str-elhep-phmath-ph+213 citations
23. 23*

    NJL-Chiral Soliton and the Nucleon Equation of State at supra-saturation density: Impact of Chiral Symmetry Restoration

    Bikram Keshari Pradhan🇫🇷 · Guy Chanfray🇫🇷 · Hubert Hansen🇫🇷 · Jérôme Margueron🇺🇸

    It has been conjectured that, at sufficiently high baryon densities, the equation of state (EoS) of bulk nuclear matter can be identified with that of the nucleon core. In this work, we illustrate how the energy density and pressure distributions inside individual nucleons can be utilized to construct the EoS of supra-dense matter. In our framework, nucleons arise as topological solitons stabilized by vector mesons, which are dynamically generated through the path integral bosonization of an underlying Nambu-Jona-Lasinio (NJL) model. The restoration of chiral symmetry is implemented dynamically via a self-consistent, density-dependent scalar field, which modifies the (isovector) and (isoscalar) channels of the soliton. We analyze the resulting changes in soliton properties for different NJL parameter sets and demonstrate that the progressive restoration of chiral symmetry leads to a stiffening of the soliton-based EoS, making it compatible with existing neutron star EoSs. An EoS constructed from the solutions of the energy-density and pressure profiles at the center of the nucleon is also explored.

    ↳ nucl-thastro-ph.HEhep-phhep-thEPJA(2026)·1 citation
24. 24*

    Analytic structure of the high-energy gravitational amplitude: multi-H diagrams and classical 5PM logarithms

    Francesco Alessio🇮🇹 · Vittorio Del Duca🇮🇹 · Riccardo Gonzo🇬🇧 · Emanuele Rosi🇮🇹 · Ira Z. Rothstein🇺🇸 · Michael Saavedra🇺🇸

    We investigate the high-energy, small-angle limit of two-body gravitational scattering. Using power counting arguments and dispersion relations in an effective field theory for the Regge regime, we derive the general loop expansion that determines how the leading Regge logarithms and their complex structure arise as a power series in $t/s$. Focusing on the tower of multi-H diagrams that govern the leading logarithmic behavior, we compute the leading double logarithm at four loops (5PM) using both effective field theory methods and the multi-Regge expansion, finding complete agreement. Finally, using the aforementioned dispersion relations, we extract the single logarithmic contribution to the imaginary part of the eikonal phase at 5PM in the Regge limit.

    ↳ hep-thgr-qchep-phPRD(2026)·10 citations
25. 25*

    $CPT$-Symmetric Kähler-Dirac Fermions

    Latham Boyle🇬🇧 · Wei-Ning Deng🇬🇧

    Kähler-Dirac (KD) spinors have generated excitement in the lattice gauge theory community, as a way to (i) deal with the ``fermion doubling" problems that plague ordinary (Dirac, Majorana, or Weyl) spinors when discretized on a lattice, and (ii) help explain the structure of the standard model. But if one naively quantizes this theory in Lorentzian signature, problems arise: half the KD fields have the ``wrong sign" Lagrangian, and give rise to negative norm states. Here we propose a new resolution/interpretation: the KD field actually lives on a two-sheeted spacetime, with the sheets related by $PT$ symmetry or, alternatively, by $i\leftrightarrow -i$. And, to avoid any unphysical interactions between the two sheets, the KD field obeys a reality condition (which we call the ``KD-Majorana condition"), which forces every particle on one sheet to be accompanied by a mirror (anti-)particle on the other sheet. We discuss how the standard model fits in this framework, how the fermion (kinetic and Yukawa) terms simplify, and how it may relate to the CPT-symmetric universe model.

    ↳ hep-thhep-lathep-phmath-ph+11 citation

* 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.