Nuclear Theory·nucl-th

Tuesday·March 4, 2025

25 papers—12 primary·13 cross-listed

01
Thermal Field Theory in the Presence of a Background Magnetic Field and its Application to QCD
Munshi G. Mustafa🇮🇳 · Aritra Bandyopadhyay🇷🇴 · Chowdhury Aminul Islam🇩🇪
This review has explored the fundamental principles of thermal field theory in the context of a background magnetic field, highlighting its theoretical framework and some of its applications to the thermo-magnetic QCD plasma generated in heavy-ion collisions. Our discussion has been limited to equilibrium systems for clarity and conciseness. We analysed bulk thermodynamic characteristics, including the phase diagram as well as real-time observables, shedding light on the behaviour and dynamics of the thermo-magnetic QCD medium relevant to heavy-ion physics.
nucl-thhep-lathep-phPPNP(2026)·5 citations
02
Investigation of Gamow-Teller strength of 186Hg within deformed pn-QRPA
Jameel-Un Nabi · Asim Ullah · Abdul Kabir · Abdul Muneem · Mahmut Boyukata
Recently the the total absorption gamma spectroscopy technique was used to determine the Gamow Teller (GT) distribution of \b{eta} decay of 186Hg. It was concluded that the best description of the measured data was obtained with dominantly prolate components for both parent 186Hg and daughter 186Au. Motivated by the recent findings, we investigate the effect of nuclear deformation on the energy distribution of the GT strength of the decay of 186Hg into 186Au within the framework of pn QRPA based on the deformed Nilsson potential. To do the needful, we first calculate the energy levels and shape prediction of 186Hg within the interacting boson model. The computed GT strength distribution satisfied the model independent Ikeda sum rule 100 % (99.98 %) for the prolate (oblate) case. Based on the strength distributions, the deformed pn QRPA model with separable interaction prefers a prolate shape for the ground state of 186Hg and supports the shape coexistence for this nucleus.
nucl-thCan.J.Phys.(2022)·0 citations
03
Thermodynamics of strongly magnetized dense quark matter from hard dense loop perturbation theory
Sarthak Satapathy🇮🇳 · Sumit🇨🇳 · Salman Ahamad Khan🇮🇳
We discuss the hard dense loop perturbation theory approach for studying the thermodynamics of strongly magnetized dense quark matter. The free energy of quarks and gluons have been calculated for one-loop quark and gluon self-energies, respectively. The longitudinal and transverse components of pressure, magnetization, second-order quark number susceptibility, and speed of sound have been computed, and their behavior with chemical potential and magnetic field has been analyzed. Our numerical results show that the longitudinal pressure increases with chemical potential and magnetic field, while for the transverse component, it is diminished. We also analyze the longitudinal component of the speed of sound at high chemical potentials, which approaches the speed of light in the asymptotic limit. The obtained results may be helpful in studying magnetized quark matter in the core of neutron stars and magnetars.
nucl-thhep-phhep-thPRD(2025)·3 citations
04
SU(3) analysis for B(E2) anomaly
Yu-xin Cheng · De-hao Zhao · Yue-yang Shao · Li Gong · Tao Wang · Xiao-shen Kang
B(E2) anomaly is becoming a hot topic in the field of nuclear structure. Since the B(E2) anomaly was experimentally found, understanding the mechanism of its production has become an important problem. Theoretical studies have found that the SU3-IBM and other extended IBM theories can give explanations, but different mechanisms were found. In this paper, the concept ``SU(3) analysis'' for B(E2) anomaly is proposed, and some new conclusions are obtained. The SU(3) third-order interaction $[L \times Q \times L]^{(0)}$ and level-crossing are both vital for the emergence of the B(E2) anomaly. This technique can help us to better understand the realistic reason of the B(E2) anomaly.
nucl-th1 citation
05
Description of nucleon transfer reactions at intermediate energies within the impulse picture
Sang-In Shim · Yoshiki Chazono · Kazuki Yoshida · Tomohiro Uesaka · Kazuyuki Ogata
Background: At intermediate energies, transfer reactions are suppressed because the momentum-matching condition is difficult to satisfy. In the standard distorted wave Born approximation (DWBA), a high momentum component of the transferred particle is required to match the large momentum transfer. Purpose: We investigate the applicability of the distorted wave impulse approximation (DWIA) for describing ( $p, d$ ) transfer reactions at intermediate energies by performing a comparative study with the standard DWBA. DWIA, which has been successful for knockout reactions, is expected to provide an alternative reaction mechanism at this energy region. Methods: Both DWBA and DWIA formalisms are applied to the $^{16}$ O( $p, d$ ){} $^{15}$ O reaction at 200~MeV. In DWBA, the reaction is described as a neutron pickup, while in DWIA, it is treated as a quasi-elastic scattering from a preformed deuteron cluster in the target. Results: The DWBA calculation is in good agreement with the experimental data, reproducing both the angular distribution and the absolute magnitude of the cross section with a reasonable spectroscopic factor. In contrast, the DWIA calculation, while qualitatively reproducing the trend of the angular distribution, severely underestimates the cross section by about two orders of magnitude. Conclusions: Our findings suggest that conventional DWBA provides a more suitable description for the $^{16}$ O( $p, d$ ){} $^{15}$ O reaction at 200~MeV. The failure of DWIA in this case, unlike its success in knockout reactions, raises open questions about its applicability to transfer reactions. This motivates the need for systematic investigations to delineate the applicability of both reaction mechanisms under various conditions.
nucl-thPRC(2026)·0 citations
06
The nuclear ground-state properties and stellar electron emission rates of 76Fe, 78Ni, 80Zn, 126Ru, 128Pd and 130Cd using RMF and pn-QRPA models
Jameel-Un Nabi · Tuncay Bayram · Gul Daraz · Abdul Kabir · Sevki Senturk
Our study consists of investigations of nuclear ground state properties and weak transition rates of even even waiting point nuclei. The calculation was performed for N = 50 and N = 82 nuclei. The Relativistic Mean Field (RMF) model was used to explore the nuclear ground state properties of selected nuclei. The proton neutron quasi particle random phase (pnQRPA) model was used for the computation of allowed Gamow Teller (GT) and unique first forbidden (U1F) transitions of the selected waiting point nuclei. The RMF approach with different density dependent interactions, DD ME2 and DD PC1, was used to compute potential energy curves and surfaces, quadrupole moments, deformation parameters, binding energies, proton neutron separation energies, charge, and radii. The RMF computed deformation parameters were used in the pn QRPA model, as a free parameter, for the computation of GT and U1F weak transitions. We investigated three different sets of deformation parameter for the calculation of electron emission rates. The rates changed considerably with change in deformation parameter. We later investigated contribution of allowed GT and U1F rates and competition between positron capture and electron emission rates at high stellar temperatures. The computed positron capture rates were significant especially at low densities and high temperatures.
nucl-thNPA(2021)·10 citations
07
Estimating nuclear equation of state parameters away from saturation density
Naosad Alam · Subrata Pal
We explore the density variation of the correlation coefficient of the key parameters of the nuclear equation of state (EoS) with the bulk and crustal properties of neutron stars. The analysis was performed using two diverse sets of nuclear effective interaction theories based on nonrelativistic Skyrme-Hartree Fock model and relativistic mean field model. We find that the commonly studied EoS parameters, namely the isoscalar incompressibility of symmetric nuclear matter $K (ρ)$ and the isovector slope of symmetry energy $L (ρ)$ , reveal consistently maximum correlation with the radius, tidal deformability, and moment of inertia all around twice the saturation density. We find even more tighter and robust correlations beyond the saturation density for constructed parameter $η = [K L^{2}]^{1/3}$ allowing the possibility to impose stringent constraints on high-density $K (ρ)$ and $L (ρ)$ . Extensive correlation analysis of the EoS parameters with the radius and tidal deformability bounds from the gravitational wave events and recent pulsar observations allow us to provide reliable constraints on the central values of $K (ρ_{0}) \approx 240$ MeV and $L (ρ_{0}) \approx 48$ MeV at saturation density and $K (1.6 ρ_{0}) \approx 33 2_{- 50}^{+ 88}$ MeV and $L (1.6 ρ_{0}) \approx 12 2_{- 18}^{+ 26}$ MeV at 1.6 times the saturation density. The crust-core transition density and the crustal fraction of moment of inertia are shown to correlate moderately with $L (ρ)$ and $η (ρ)$ near the subsaturation density.
nucl-thPRC(2025)·0 citations
08
Effective proton-neutron interaction in mirror nuclei
Y. M. Xing · Y. F. Luo · K. H. Li · Y. H. Zhang · J. G. Li · M. Wang · Yu. A. Litvinov · K. Blaum · X. L. Yan · T. Liao · M. Zhang · X. Zhou
Effective proton-neutron interactions, $V_{p n}$ , in mirror nuclei are systematically analyzed using the ground-state atomic masses. A mirror symmetry of $V_{p n}$ is found for bound nuclei with a standard deviation of $σ = 32$ keV. However, this mirror symmetry is apparently broken for some mirror-nuclei pairs when a proton-unbound nucleus is involved in extracting the $V_{p n}$ values. Such a mirror-symmetry breaking is attributed to the Thomas-Ehrman shift of the proton-unbound nucleus and investigated by using the Gamow shell model. It is concluded that the Thomas-Ehrman shift originates mainly from reduced Coulomb energies in the proton-unbound nuclei due to the extended radial density distribution of valence protons.
nucl-thnucl-exPRC(2025)·4 citations
09
Resonant Nuclear Fusion at Second Order
Harishyam Kumar Pankaj Jain
We study the possibility of low energy nuclear fusion assisted by a low energy resonance. We use a simple potential model and replace repulsive Coulomb barrier with a step potential barrier. This is convenient since it allows us to perform analytic calculations and allows better control on approximations. The fusion process involves a proton and another nucleus. We first consider a process in which this transition takes place by emission of a single photon at first order in perturbation theory. At this order we find a very large cross section over a very narrow range of initial momenta, corresponding to the resonance width. The cross section rapidly drops to very small values as we move away from resonance. In any experimental situation, the rate for this process would be negligible since it is practically impossible to have a significant number of initial state particles at precisely the resonant energy. We next consider another process, which involves emission of two photons and gets dominant contribution at second order in perturbation theory. In this case the initial state energy is taken to be larger than the resonance energy. We find a significant cross section, provided the initial energy is larger than the resonant energy. The exponential suppression factors cancel out in this calculation. The experimental signature for this process is two photon emission within very narrow range of energies. One of the photon would be emitted at low energy of order of the initial state energy and the second would correspond to the nuclear energy.
nucl-thPRC(2025)·2 citations
10
The $α$ -particle condensation in diluted $^{16} O$ at finite temperature
M. Davies🇬🇧 · E. Yüksel🇬🇧 · J.-P. Ebran🇫🇷 · E. Khan🇫🇷 · P. Stevenson🇬🇧
We investigate the effect of temperature on $α$ -particle clustering in the diluted nucleus $^{16} O$ using the multi-constrained finite-temperature relativistic Hartree-Bogoliubov model with the DD-ME2 interaction. At a critical density the nucleus undergoes a Mott-like transition from a homogeneous to a localised configuration characterised by $α$ -particle clustering and the emergence of a finite non-axial octupole deformation. We study the interplay between the onset of localisation under nuclear dilution and the suppression of deformation and $α$ -particle clustering due to increasing temperature. Investigating the temperature-density plane, our findings indicate that temperature delays the formation of non-axial octupole deformation and $α$ -particle clustering in dilute environments. Following the transition from homogeneous to clustered configurations, the non-axial octupole deformation continues to increase with further dilution of the system and becomes nearly independent of temperature. We found that $α$ -particle clusters appear at temperatures up to $T = 4.10$ MeV and at a corresponding normalised density $ρ_{Mott} / ρ_{0} \approx 0.09$ .
nucl-thPRC(2025)·1 citation
11
Charmed hadron production from secondary anti-proton + proton annihilations in p+A reactions at FAIR
Tom Reichert🇩🇪 · Jan Steinheimer🇩🇪 · Marcus Bleicher🇩🇪
We present estimates for the production cross sections of exotic states ( $Λ_{c}, Σ_{c}, Ξ_{c}, D and D_{s}$ ) from secondary $B + B$ annihilations in p+A reactions from $E_{lab} = 10 - 30 A$ ~GeV. We focus specifically on the newly planned hadron physics program of CBM at FAIR. These estimates for the production of exotic states are based on the achievable number of $B + B$ annihilations and their invariant mass distributions calculated in the UrQMD transport model.
nucl-thhep-phnucl-exEPJA(2025)·5 citations
12
An Efficient Learning Method to Connect Observables
Hang Yu · Takayuki Miyagi
Constructing fast and accurate surrogate models is a key ingredient for making robust predictions in many topics. We introduce a new model, the Multiparameter Eigenvalue Problem (MEP) emulator. The new method connects emulators and can make predictions directly from observables to observables. We present that the MEP emulator can be trained with data from Eigenvector Continuation (EC) and Parametric Matrix Model (PMM) emulators. A simple simulation on a one-dimensional lattice confirms the performance of the MEP emulator. Using $^{28}$ O as an example, we also demonstrate that the predictive probability distribution of the target observables can be easily obtained through the new emulator.
nucl-thcs.LGphysics.comp-phstat.MLPRL(2026)·6 citations
13
The quantum Newton's bucket: Active and passive rotations in quantum theory
Augusto Facundes🇧🇷 · Kayman Jhosef Goncalves🇧🇷 · Giorgio Torrieri🇧🇷
Motivated both by classical physics problems associated with ``Newton's bucket'' and recent developments related to QCD in rotating frames of reference relevant to heavy ion collisions, we discuss the difference between ``active'' and ``passive'' rotations in quantum systems. We examine some relevant potentials and give general symmetry arguments to give criteria where such rotations give the same results. We close with a discussion of how this can be translated to quantum field theory.
↳ quant-phgr-qchep-phhep-th+1Mod.Phys.Lett.A(2026)·2 citations
14
Assessment of universal relations among second-order moments of relativistic stars via reformulated perturbation equations
Koutarou Kyutoku
We assess the universal relations among second-order moments of relativistic stars, namely the moment of inertia, tidal deformability, and spin-induced quadrupole moment, via reformulated perturbation equations. After constructing the spherical background configuration by solving two ordinary differential equations as usual, these three moments are obtained by solving four additional ordinary differential equations. They are solved numerically from the stellar center to the surface, and we do not need to derive homogeneous solutions for obtaining the quadrupole moment. This small number of ordinary differential equations to be solved enables us to identify the primary variable for each second-order moment. Investigating the profile of these variables in the star, we speculate that their nonmonotonic behavior, enhanced typically for soft equations of state and/or high compactnesses, introduces the variety to the relations among these second-order moments unless the black-hole limit is approached. Because realistic relativistic stars are widely believed to be characterized by stiff equations of state, they enjoy the universal relation to a great extent.
↳ gr-qcastro-ph.HEnucl-thPRD(2025)·6 citations
15
One-loop off-shell quark-gluon vertex in arbitrary gauge and dimensions: a streamlined approach through the second-order formalism of QCD
Victor Miguel Banda Guzmán🇲🇽 · Adnan Bashir🇲🇽
The standard Feynman rules used for perturbative calculations in quantum chromodynamics (QCD) are derived from a Lagrangian that is first-order in derivatives. It includes a three-point quark-gluon vertex which obscures the precise disentangled manner in which spin and momentum are interchanged during these interactions. An unambiguous understanding of this interchange is insightful for efficiently extracting physically relevant information from various Green's functions. To separate the scalar and spin degrees of freedom and gain physical insight from the outset, we examine the quark-gluon vertex using the less commonly employed second-order formalism of QCD. We compute this off-shell vertex in arbitrary space-time dimensions and covariant gauges by using scalar integrals with shifted dimensions, which include higher powers of the propagators, within a combined first- and second-order formalism. This approach naturally identifies the transverse components of the quark-gluon vertex, even before evaluating the tensor Feynman integrals. We also compute the on-shell version of this vertex using exclusively the second-order formalism, facilitating a precise identification of spin and momentum interchange. Through analyzing the Pauli form factor at $k^{2} = 0$ (where $k$ represents the momentum of the external gluon), we find that only a specific set of second-order Feynman diagrams are relevant for calculating the electromagnetic and chromomagnetic dipole moments. These diagrams represent quantum processes in which the spin of the incoming quark changes only once due to interactions with the virtual gluons that form the quark-gluon vertex. All other interactions involve only momentum interchange (scalar interactions). Our results are in complete agreement with those obtained from the first-order formalism.
↳ hep-phhep-thnucl-thPRD(2025)·2 citations
16
Does $f_{1} (1420)$ have a double-peak structure?
Bao-Xi Sun🇨🇳
The one-pion exchange interaction between the kaon and the vector antikaon is investigated by solving the Schrodinger equation in the S-wave approximation. In addition to the $f_{1} (1285)$ particle, another bound state of $K K ˉ^{*}$ is found, which is approximately 9 MeV below the threshold of $K K ˉ^{*}$ and labeled $f_{1} (1378)$ for convenience in this manuscript. Under the outgoing wave condition, two resonance states of $K K ˉ^{*}$ are produced by solving the Schrodinger equation with different coupling constants in the one-pion-exchange potential fixed with the binding energies of $K K ˉ^{*}$ bound states $f_{1} (1285)$ and $f_{1} (1378)$ respectively. Both of the resonance states are located in the vicinity of 1400 MeV, and thus it is reasonable to assume that these two resonance states correspond to the $f_{1} (1420)$ particle in the review of the Particle Data Group although they arise from different couplings of the kaon and vector antikaon, respectively.
↳ hep-phnucl-th0 citations
17
Possible Explanation of $F_{2}^{n} / F_{2}^{p}$ at Large $x$ Using Quantum Statistical Mechanics
C. Bourrely🇫🇷 · F. Buccella🇮🇹 · W. C. Chang🇹🇼 · D. Di Bari🇮🇹 · P. H. Frampton🇮🇹 · J. C. Peng🇺🇸
The recent accurate measurements of the scattering of electrons off of the mirror nuclei $^{3}$ H and $^{3}$ He show with small errors that the neutron to proton ratio $r (x) = F_{2}^{n} (x) / F_{2}^{p} (x)$ , approaches a value larger than 1/4 for $x \to 1$ . We suggest a possible explanation for this experimental result by studying the consequences of the Pauli exclusion principle for the parton distribution when the ratio is described by quantum statistical mechanics description in terms of three parameters inspired by the quantum statistical approach.
↳ hep-phnucl-thNPA(2026)·1 citation
18
Time-evolution of parity-odd cascades in homogeneous Abelian and non-Abelian media with chiral imbalance
Jeremy Hansen🇺🇸 · Kirill Tuchin🇺🇸
We study radiation by a fast particle in a medium with a finite chiral chemical potential. The medium's anomalous response encompasses the chiral magnetic effect, enabling novel chiral Cherenkov and pair production processes. The kinematics of the corresponding cascades is fundamentally different from conventional cascades. Notably, it is not dominated by the strong ordering of momenta. Employing the effective Chern-Simons extensions of QED and QCD to incorporate the chiral magnetic effect, we derive and solve the evolution equations describing the cascades in a chiral medium, presuming that the anomalous contributions are dominant.
↳ hep-phhep-thnucl-thPRD(2025)·5 citations
19
General behavior of near-threshold hadron scattering for exotic hadrons
Katsuyoshi Sone · Tetsuo Hyodo
We discuss the general behavior of the near-threshold scattering amplitude with channel couplings. The signal of the exotic hadrons near the threshold may manifest as a dip structure in the cross section originated from a zero point of the scattering amplitude. Such a dip structure by the zero point cannot be reproduced by the Flatté amplitude which is widely used for the analysis of exotic hadrons, because of the constraints imposed on the Flatté amplitude near the threshold. In this work, we propose the General amplitude which can describe the dip structure near the threshold, in contrast to the Flatté amplitude. Moreover, we numerically study the behavior of the near-threshold cross section in relation to the zero point.
↳ hep-phnucl-thPoS(2025)·0 citations
20
Effects of Initial Nucleon-Nucleon Correlations on Light Nuclei Production in Au+Au Collisions at $s_{NN} = 3$ GeV
Qian-Ru Lin🇨🇳 · Yu-Jing Huang🇨🇳 · Long-Gang Pang🇨🇳 · Xiao-Feng Luo · Xin-Nian Wang🇨🇳
Light nuclei production in heavy-ion collisions serves as a sensitive probe of the QCD phase structure. In coalescence models, triton ( $N_{t}$ ) and deuteron ( $N_{d}$ ) yields depend on the spatial separation of nucleon pairs ( $Δ r$ ) in Wigner functions, yet the impact of initial two-nucleon correlations $ρ (Δ r)$ remains underexplored. We develop a method to sample nucleons in $^{197}$ Au nuclei that simultaneously satisfies both the single-particle distribution $f (r)$ and the two-nucleon correlation $ρ (Δ r)$ . Using these nuclei, we simulate Au+Au collisions at $s_{NN} = 3$ GeV via the SMASH transport model (mean-field mode) to calculate proton, deuteron, and triton yields. Simulations reveal a 36% enhancement in mid-rapidity deuteron yields across all centrality ranges and a 33% rise in mid-rapidity triton production for 0-10% central collisions. Calculated transverse momentum of light nuclei aligns with STAR data. We further analyze impacts of baryon conservation, spectator exclusion, and centrality determination via charged multiplicity. Notably, observed discrepancies in the double yield ratio suggest unaccounted physical mechanisms, such as critical fluctuations or inaccuracies in coalescence parameters or light nuclei cross-sections. This underscores the critical role of initial nucleon-nucleon correlations, linking microscopic nuclear structure to intermediate-energy collision dynamics.
↳ hep-phnucl-th4 citations
21
Role of the short-range dynamics in the formation of $D^{(*)} D ˉ^{(*)} / B^{(*)} B ˉ^{(*)}$ hadronic molecules
Nijiati Yalikun🇨🇳 · Xiang-Kun Dong🇩🇪 · Ulf-G. Meißner🇩🇪
We investigate potential hadronic molecular states in the $D^{(*)} D ˉ^{(*)}$ and $B^{(*)} B ˉ^{*}$ systems using light meson exchange interactions. Our analysis focuses on coupled-channel systems with spin-parity quantum numbers $J^{P C} = 0^{++}$ , $1^{+\pm}$ and $2^{++}$ , examining how the $δ (r)$ potential affects states near threshold. Using coupled-channel analysis, we reproduce the $X (3872)$ mass with a given cutoff for the $(I) J^{P C} = (0) 1^{++}$ state, finding a minimal impact from the $δ (r)$ term. At this cutoff, both the $(0) 0^{++}$ state near the $D D ˉ$ threshold and the $(0) 1^{+-}$ state near the $D D ˉ^{*}$ threshold show less sensitivity to the $δ (r)$ term compared to the three states- $(0) 0^{++}$ , $(0) 1^{+-}$ , and $(0) 2^{++}$ -near the $D^{*} D ˉ^{*}$ threshold. As anticipated, the $B^{(*)} B ˉ^{*}$ systems exhibit similar behavior but with stronger binding due to their larger reduced mass. These findings suggest promising directions for future experimental searches, particularly in the isoscalar sector, which could substantially advance our understanding of exotic tetraquark states.
↳ hep-phnucl-thPRD(2025)·11 citations
22
$Z = 14$ Magicity Revealed by the Mass of the Proton Dripline Nucleus $^{22}$ Si
Y. M. Xing · Y. F. Luo · Y. H. Zhang · M. Wang · X. H. Zhou · J. G. Li · K. H. Li · Q. Yuan · Y. F. Niu · J. Y. Guo · J. C. Pei · F. R. Xu and 27 other authors
Using the $B ρ$ -defined isochronous mass spectrometry technique, we conducted the first mass measurement of the proton dripline nucleus $^{22}$ Si. We confirm that $^{22}$ Si is bound against particle emission with $S_{p} / S_{2 p} = + 1412 (114) / + 229 (54)$ keV, fixing the proton dripline location for the Si element. By analyzing the mass differences of the neighboring $s d$ -shell nuclei, we find that $^{22}$ Si exhibits a doubly-magic character similar to its mirror partner $^{22}$ O, and that the mirror energy difference of $^{22}$ Si- $^{22}$ O deviates from the predictions assuming mirror symmetry. Gamow shell-model calculations reveal that the average occupations of valence protons in $^{22}$ Si are nearly identical to those of valence neutrons in $^{22}$ O, supporting the $Z = 14$ magicity in $^{22}$ Si. The observed mirror-symmetry breaking is attributed to the extended proton distribution in $^{22}$ Si arising from a small contribution of the unbound $π 2 s_{1/2}$ orbital.
↳ nucl-exnucl-thPRL(2025)·18 citations
23
Neutrinos from dense environments
M. Cristina Volpe (CNRS, APC)🇫🇷
Neutrinos from dense environments are unique laboratories for astrophysics, particle physics and many-body physics. They tell us about the last stages of the gravitational core-collapse and the explosion of massive stars. These elusive particles are also tightly linked to heavy elements synthesis in gravitational core-collapse supernovae and binary neutron star mergers, or play a pivotal role at the MeV epoch during the Universe expansion. We highlight theoretical and observational aspects of this interesting domain, in particular for the future measurement of neutrinos from the next core-collapse supernova, and of the diffuse supernova background, whose discovery might lie in the forthcoming future.
↳ astro-ph.HEastro-ph.SRhep-phnucl-th0 citations
24
Exploring X17 and dark charges in the context of Standard Model tensions
Antonio Capolupo🇮🇹 · Aniello Quaranta🇮🇹 · Raoul Serao🇮🇹
We report on recent results, according to which the hyphothetical X17 boson could affect the muon g-2 anomaly and the Lamb Shift. Moreover by considering the kinetic mixing between this new boson and the U(1)Y we establish possible contribution of the X17 to the W mass.
↳ hep-phhep-thnucl-th1 citation
25
Gradient corrections to the local-equilibrium energy-momentum tensor in the Zubarev approach
Sergii V. Akkelin🇺🇦 · Dirk H. Rischke🇩🇪
We compute the expectation value of the energy-momentum tensor of a real scalar field in an approximation which accounts for spacetime gradients of the hydrodynamical variables in local thermodynamical equilibrium. We show that the energy-momentum tensor receives corrections with respect to the standard local-equilibrium result. Notably, the relation between the energy density and pressure, i.e., the equation of state, is modified with respect to the one in global equilibrium. The obtained corrections might be relevant for systems created in relativistic hadron and heavy-ion collisions.
↳ hep-phhep-thnucl-thPRD(2025)·2 citations

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