Nuclear Theory·nucl-th

Tuesday·March 3, 2026

19 papers—11 primary·8 cross-listed

01
[Submitted on 27 Feb 2026]
Spin-2 Mesons in a Relativistic Hartree Description of Nuclei
Brendan T. Reed🇺🇸 · Marc Salinas🇺🇸
The role of the isovector spin-orbit potential in nuclear modeling has recently been explored in greater detail due largely in part to the PREX and CREX parity violating electron scattering (PVES) experiments. The result of both experiments have shown that the neutron-rich skins of $^{48}$ Ca and $^{208}$ Pb, as determined by the experimental analysis, are largely incompatible with current nuclear model predictions. One way to address, and potentially solve, this incompatibility has been to enhance the isovector spin-orbit sector of density functional models. Here, we explore the range of possible enhancements in the context of covariant density functional theory by introducing a new class of spin-2 \textit{massive} mesons to the Lagrangian. In doing so, we find that these mesons not only meaningfully contribute to the theory, but also mitigate problems seen in other works which enhance spin-orbit effects in finite nuclei. We also discuss the implications and future regarding this ``dilemma'' as it pertains to studies of nuclear forces and future experiments such as the Mainz Radius Experiment (MREX).
Comments:
12 pages of article, 9 pages of appendix derivations, 8 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2603.00274 [pdf]
0 citations
02
[Submitted on 27 Feb 2026]
Electromagnetic Properties of the N=50 Isotones with the p35-i3 Hamiltonian
J. A. Purcell · B. A. Brown
The nuclei with 50 neutrons that lie between $^{78}$ Ni and $^{100}$ Sn have provided benchmark studies of the nuclear shell model for protons in the ${0 f_{5/2}, 1 p_{3/2}, 1 p_{1/2}, 0 g_{9/2}}$ model space. New Hamiltonians for this model space have recently been obtained based on valence-space in-medium renormalization-group (VS-IMSRG) methods with two- and three-nucleon interactions. The two-body matrix elements (TBME) obtained from these ab-initio methods served as the starting point for singular-value decomposition (SVD) method fits of the TBME to experimental binding energies and excitation energies, resulting in Hamiltonians called p35-i2, p35-i3 and p30-i3. In this paper, magnetic moments, quadrupole moments, $B (M 1)$ and $B (E 2)$ values obtained with these Hamiltonians are presented and compared to experiment. Results obtained from various Hamiltonians are compared to assess the theoretical uncertainties.
Comments:
12 pages, 17 figures, 4 tables, submitted to Phys. Rev. C
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2603.00352 [pdf]
PRC(2026)·0 citations
03
[Submitted on 27 Feb 2026]
Relativistic Effects in Femtoscopy and Deuteron Formation
Stanislaw Mrowczynski
For a long time studies of femtoscopic correlations have provided information about space-time characteristics of particle sources in high-energy collisions. Recently, the correlation functions have been also used to determine interaction parameters of correlated particles which is especially important for short-lived particles, for which scattering experiment are impossible. The abundance of experimental data and their high accuracy require an improved theoretical approach to femtoscopic correlations. We discuss relativistic effects and their role in detail. Since a general relativistic approach is currently unavailable, due to serious theoretical difficulties, the correlation functions must be computed in the center-of-mass frame where the correlated particles are mostly nonrelativistic. This requires transforming the source function to this frame, the consequences of which we discuss. Since the deutron formation has a similar physical origin to femtoscopic correlations, we also discuss relativistic effects in the former process. We illustrate our considerations with calculations of some correlation functions and the deuteron coalescence coefficient to demonstrate a magnitude of relativistic effects. We also argue that a discrepancy between the coalescence coefficient computed with the source radii inferred from the baryon-baryon correlation functions and the experimental data can be removed by taking into account the relativistic elongation of the source radius in the center of mass of correlated particles.
Comments:
17 pages, 4 figures, Phys. Rev. C in print
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2603.00354 [pdf]
0 citations
04
[Submitted on 1 Mar 2026]
Angular momentum conservation and pion production in intermediate-energy heavy-ion collisions
Hao-Nan Liu🇨🇳 · Rong-Jun Liu🇨🇳 · Jun Xu🇨🇳
We have studied the effect of rigorous angular momentum conservation (AMC) in elastic, inelastic, and decay channels on pion production in intermediate-energy heavy-ion collisions based on the framework of an isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model. We found that the constraint of AMC suppresses the absorption of both $Δ$ resonances and pions, thus considerably enhances pion production and meanwhile reduces the charged pion yield ratio. The AMC effect on the charged pion yield ratio can not be simply compensated by a density-dependent in-medium $Δ$ production cross section. Therefore, incorporating the constraint of AMC is important in obtaining the correct pion multiplicity and charged pion yield ratio by transport simulations, relevant for the extraction of the nuclear symmetry energy at high densities.
Comments:
7 pages, 6 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2603.00865 [pdf]
PLB(2026)·0 citations
05
[Submitted on 1 Mar 2026]
QCD phase transition at finite isospin density and magnetic field
Chujun Ke🇨🇳 · Gaoqing Cao🇨🇳
The QCD phase transition is explored at finite isospin density and magnetic field within the extended two-flavor Nambu--Jona-Lasinio model. By adopting the Ginzburg-Landau approximation, we study the transitions from normal chiral symmetry breaking phase to pion superfluidity or rho superconductivity. To avoid the artificial divergence for a large isospin chemical potential, we adopt the Landau representation rather than the proper-time one for the fermion propagators in a constant magnetic field. For the Landau representation, the same cutoff to the Landau energies, rather than to Landau levels, should be adopted to regularize the divergences from the summations over Landau levels. Then, the Ginzburg-Landau coefficients for pion and rho mesons are worked out both analytically and numerically in random phase approximation. The results show that pion superfluidity is favored for a small magnetic field while rho superconductivity is favored for a large magnetic field when increasing isospin chemical potential, in line with the magnetic enhancement (deduction) of the lowest energy of $π^{+} (ρ^{+})$ meson. The novel rho superconductivity phase at large magnetic field and finite isospin density implies an interesting and nontrivial interplay between QCD and QED.
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2603.01061 [pdf]
1 citation
06
[Submitted on 2 Mar 2026]
Auxiliary counterterms and their role in effective field theory
Manuel Pavon Valderrama🇨🇳
Effective field theories include contact-range interactions (or counterterms) for two reasons: representing the unknown short-range physics in a model independent manner and ensuring the cutoff independence of observables. Both are intertwined: cutoff independence alone (modulo truncation errors) already generates counterterms encoding physical information not present in the known long-range physics. Yet, there is also residual cutoff dependence, which is smaller than the uncertainties that are achievable within the effective field theory description and thus can be safely neglected in most settings. If one insists on exact cutoff independence though, new counterterms will be required, but they encode no new physical information and are thus what one could call redundant, or auxiliary, counterterms. It happens that auxiliary counterterms are still useful for solving certain inconsistencies that appear during renormalization or for improving the convergence of the effective field theory expansion. Examples of these use cases are discussed, including the interpretation of the improved actions or the relation between perturbative and non-perturbative renormalization.
Comments:
19 pages, corresponds with published version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2603.01561 [pdf]
EPJA(2026)·2 citations
07
[Submitted on 2 Mar 2026]
Sensitivity of Isotopic Fission Yields in Actinides to the Macroscopic Liquid-Drop Model: LSD vs ISOLDA
K. Pomorski · A. Augustyn · T. Cap · Y. J. Chen · M. Kowal · B. Nerlo-Pomorska · M. Warda · Z. G. Xiao
The impact of the macroscopic liquid-drop prescription on isotope-resolved fission-fragment yields in the actinide region is assessed by comparing two alternative parameterizations: the Lublin--Strasbourg Drop (LSD) model and the ISOscalar Liquid Drop Approximation (ISOLDA). The two prescriptions differ primarily in the treatment of isospin dependence in the volume and surface terms; in ISOLDA, an explicit dependence on the isospin square $T (T + 1)$ , where $T = ∣ N - Z ∣/2$ , is introduced in both coefficients. Using an identical set of fragment-yield observables and the same experimental reference (fission of $^{250}$ Cf $^{*}$ at low and high energies), the propagation of the macroscopic-energy choice into the predicted yields is quantified in terms of (i) the location of the most probable post-neutron isotopes along elemental chains, (ii) the widths and asymmetries of the isotopic distributions, and (iii) the population of neighboring nuclides on the distribution tails. A comparable description of the gross properties of the isotopic yield pattern is obtained with both prescriptions, particularly for light and intermediate fragments, where peak positions and near-maximum curvatures are reproduced similarly. The most discriminating differences are found for heavy-fragment chains, for which the ridge location and isotopic centroids are rendered more sensitive to macroscopic isospin terms. Overall, a closer average agreement with the evaluated data is obtained with LSD, while the LSD--ISOLDA spread is shown to provide a practical estimate of the macroscopic-model uncertainty in isotope-resolved yields.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2603.01794 [pdf]
0 citations
08
[Submitted on 2 Mar 2026]
Recent developments and applications of the relativistic chiral nuclear force
Li-Sheng Geng🇨🇳 · Jun-Xu Lu🇨🇳 · Qing-Yu Zhai🇨🇳 · Zhi-Wei Liu🇨🇳 · Shihang Shen🇨🇳
The nuclear force is central to our understanding of complex nuclear phenomena and to the applications of nuclear techniques. The nonperturbative nature of the low-energy strong interaction and the color confinement have made an ab initio understanding of the nuclear force a challenge for almost a century since the pioneering work of Yukawa. Since 1990, chiral effective field theory (ChEFT) has become the de facto standard for describing nuclear interactions--most prior studies employed heavy-baryon chiral perturbation theory. Only recently, there have been successful attempts to construct a chiral nuclear force employing covariant baryon chiral perturbation theory. In this work, we review recent developments and applications of relativistic chiral nuclear forces. We first elaborate on the necessity of relativistic/covariant theories, then present the construction of the first high-precision relativistic chiral nuclear force up to next-to-next-to-leading order (NNLO), and discuss the ongoing progress in higher-order nucleon-nucleon (NN) and $n d$ scattering, as well as their applications in nuclear matter, finite nuclei, and hypernuclear systems. Finally, we summarize the achievements and outline the future outlook of this research field.
Comments:
24 pages, 14 figures, plenary talk given by Li-Sheng Geng at the International Symposium Commemorating the 40th Anniversary of the Halo Nuclei (HALO-40)
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2603.01819 [pdf]
Particles(2026)·1 citation
09
[Submitted on 2 Mar 2026]
Hadronic description of nuclear matter and neutron star properties
Yao Ma🇨🇳 · Yong-Liang Ma🇨🇳 · Jia-Ying Xiong🇨🇳
The composition of the neutron star is one of the most fundamental and long-standing problems in nuclear- and astro-physics. The known properties of nuclear matter, together with the astronomical observations, impose the stringent and interconnected constraints on the theoretical descriptions. In this work, by using the most general quantum hadrodynamics model including $σ, ω, ρ$ and $a_{0}$ in addition to nucleons, and performing a Bayesian joint analysis of experimental nuclear matter data and astrophysical observations, we point out that the nuclear matter made of only hadrons can provide a unified description of nuclear matter properties and astrophysical observations at $1 σ$ -level. In addition, we find that the existence of $\sigma\omega\rho a_0$ interaction naturally leads to a peak structure in the speed of sound at $\sim (2 - 3)$ times saturation density $n_{0}$ which results to a small size intermediate mass neutron star and the upper bound mass $\sim 2 M_{⊙}$ . What we find here indicate that the sequential measurement of neutron star mass and radius by the next generation facilities, especially that of the intermediate mass neutron stars, is crucial for distinguishing the pure nucleonic stars from the hybrid ones.
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
arXiv:
2603.01933 [pdf]
3 citations
10
[Submitted on 2 Mar 2026]
Explicit asymptotics of coupling matrix elements for central potentials in the hyperspherical harmonics expansion method
Emile Meoto · Mantile L. Lekala
The analytic structure and asymptotic behavior of channel-coupling potentials in three-body systems are investigated within the framework of the hyperspherical harmonics expansion method. The coupling between different Jacobi partitions is expressed using Raynal--Revai transformation coefficients and a reduced hyperangular integral that contains the two-body interaction. For central potentials, this integral is factorised into geometric and dynamical components. Explicit asymptotic scaling laws are derived for the hyperradial coupling strength in the limit of large hyperradius $ρ \to \infty$ for representative nuclear potentials: Gaussian, Yukawa, and Woods--Saxon potentials (short-range), and Coulomb potential (long-range). These short-range potentials are found to exhibit an algebraic decay $\propto ρ^{- (2 ℓ_{η_{i}} + 3)}$ , where $ℓ_{η_{i}}$ is the orbital angular momentum of the interacting pair. This decay is shown to lead to efficient asymptotic decoupling of hyperspherical channels. In contrast, the Coulomb interaction yields couplings that decay only as $1/ ρ$ , indicating persistent channel coupling at large distances and explaining the slow convergence of hyperspherical expansions for charged systems. These results provide a quantitative basis for truncating the hyperradial domain, for example, in choosing a matching radius for scattering calculations or an upper integration limit in bound-state problems.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2603.02020 [pdf]
NPA(2026)·0 citations
11
[Submitted on 2 Mar 2026]
Spinodal instability in nuclear matter with light cluster degrees of freedom
Stefano Burrello🇮🇹 · Carmelo Piazza🇮🇹 · Rui Wang🇮🇹 · Maria Colonna🇮🇹
We investigate the thermodynamical stability of low-density isospin-symmetric nuclear matter at finite temperature, explicitly including light clusters as degrees of freedom. Within a generalized mean-field framework, we compute the curvature matrix of the free-energy density and determine the spinodal region, identifying the conditions under which mechanically unstable modes may develop in the presence of clustering. Particular attention is devoted to the formal consequences of introducing an infrared momentum cutoff in the density and current moments, which effectively accounts for Pauli-blocking effects and the associated reduction of low-momentum quasiparticle states in the medium. We show that when the cutoff is density dependent, thermodynamic consistency requires additional contributions to the chemical potentials and extra terms also appear in the first hydrodynamic moment, influencing both the stability analysis and the location of the spinodal boundary. We further examine the character of the unstable modes and find that a sufficiently stiff density dependence of the cutoff may drive clusters to fluctuate out of phase with nucleons, pushing them toward low-density regions while nucleonic instabilities grow, in contrast with the in-phase pattern obtained when in-medium effects are neglected. Our results shed new light on the role of light clusters in the phase dynamics of warm, dilute nuclear matter, with implications for heavy-ion collisions and for the physics of neutron-star crusts.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2603.02060 [pdf]
PRC(2026)·2 citations
12
[Submitted on 27 Feb 2026] (cross-list from hep-ph)
An EFT approach to Color decoherence in jet quenching
Varun Vaidya🇺🇸
We use the EFT developed in \cite{Mehtar-Tani:2025xxd}, to understand the interference driven phenomenon of color decoherence in inclusive jet production in a dense nuclear medium such as Nuclei or Quark Gluon Plasma. Using the factorization formula in \cite{Mehtar-Tani:2024smp,Mehtar-Tani:2025xxd}, expressed as a series of multi-sub-jet operators, we define and calculate the contribution of the two sub-jet effective operator. This explicitly reveals the emergent angular scale $θ_{c}$ that controls color decoherence as well an intricate renormalization group structure for the factorized functions. We show that for a jet of radius R in a medium of size L characterized by a jet quenching parameter $q^$ , both the LPM effect and color decoherence are controlled by a single dimensionless parameter $q^L L R$ and therefore are equally important for phenomenology. This paper shows how interference driven emergent effects can be included in a factorized framework for computing jet observables in heavy ion collisions.
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2603.00238 [pdf]
5 citations
13
[Submitted on 27 Feb 2026] (cross-list from nucl-ex)
Physics Opportunities with a Fixed-Target Program at the Electron-Ion Collider
C.-J. Naïm🇺🇸 · A. Sorensen🇺🇸 · D. Brown🇺🇸 · D. Cebra🇺🇸 · R. Corliss🇺🇸 · J. M. Durham🇺🇸 · R. Vogt🇺🇸
A fixed-target program at the Electron-Ion Collider (EIC) would broaden the facility's scientific reach by providing key measurements for studies of cold nuclear matter (CNM), the QCD phase diagram, and nuclear reactions relevant for space radiation. Constraining CNM effects is essential for interpreting observables in proton-nucleus ( $p + A$ ) and nucleus-nucleus ( $A + A$ ) collisions, yet these effects are poorly understood at low center-of-mass energies. In particular, the range $s \approx 10$ --20 GeV, where several CNM effects may compete at similar scales, has not been explored with high statistical precision. Mapping the QCD phase diagram similarly requires high-statistics $A + A$ data with broad rapidity and transverse-momentum coverage to probe the onset of deconfinement and the possible location of the QCD critical point (CP). Currently, such data are limited at 4.5 GeV $< s_{N N} < 7.7$ GeV A fixed-target program at the EIC would fill these gaps, providing CNM baselines and complementary data for QCD CP studies. By delivering high luminosity and systematic measurements across a broad range of nuclear targets, the program would link $p + A$ and $A + A$ systems at the same center-of-mass energies, enabling a unified, quantitative description of cold QCD matter and clarifying the interpretation of QGP signatures in $A + A$ collisions at low energies where comparable $p + A$ data are lacking. Finally, the program would offer a unique opportunity to measure nuclear cross sections critical for improving cosmic-ray models, including studies of space-radiation protection for both autonomous spacecraft and long-duration human spaceflight.
Comments:
11 pages, 7 figures
Subjects:
Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2603.00265 [pdf]
1 citation
14
[Submitted on 1 Mar 2026] (cross-list from hep-ph)
Covariant diffusion tensor for jet momentum broadening out of equilibrium
Isabella Danhoni🇺🇸 · Nicki Mullins🇺🇸 · Jorge Noronha🇺🇸
Jets are produced in the earliest stages of heavy-ion collisions, where they can interact with a medium that is not yet close to local equilibrium. Motivated by this, we generalize the usual jet transport coefficient $q^$ to a Lorentz-covariant diffusion tensor $q^^{μν}$ within a leading-order elastic (Boltzmann/Fokker--Planck) description of jet--medium interactions. The tensor formulation organizes medium effects in a frame-covariant way and reveals additional information beyond the standard scalar definition, including energy diffusion and off-diagonal components that encode correlations between energy and momentum exchange which are absent (or redundant) in equilibrium. We illustrate the formalism in (tree-level) massless $λ φ^{4}$ theory for isotropic but out-of-equilibrium states. For sufficiently large jet momentum, quantum statistical effects become subleading, so that the non-equilibrium evolution can be studied reliably in the classical (Boltzmann) limit. This allows us to solve the corresponding Boltzmann equation for the medium and determine the time dependence of $q^^{μν}$ as the system approaches equilibrium. We find that out-of-equilibrium corrections can either enhance or reduce jet momentum broadening, depending on the initial distribution function.
Comments:
Updated Refs
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2603.00844 [pdf]
3 citations
15
[Submitted on 1 Mar 2026] (cross-list from hep-lat)
Continuum limit of a qubit-regularized SU(3) lattice gauge theory with glueballs
Rui Xian Siew🇺🇸 · Shailesh Chandrasekharan🇺🇸 · Tanmoy Bhattacharya🇺🇸
We show that a simple qubit-regularized $SU (3)$ lattice gauge theory (LGT) on a plaquette chain admits a continuum limit with massive glueball excitations, providing a minimal toy model of strong interactions without quarks. By mapping the plaquette-chain Hamiltonian to the three-state quantum clock model in a magnetic field, we demonstrate that the theory can be tuned to a continuum limit governed at short distances by the $Z_{3}$ parafermion conformal field theory (CFT), which serves as the ultraviolet (UV) fixed point. A small relevant magnetic perturbation then drives the system to a massive continuum quantum field theory in the infrared (IR). The resulting relativistic massive particles can be interpreted as quasi one-dimensional analogues of glueballs. In the continuum theory we compute the ratio of the lowest glueball masses with opposite charge conjugation to be $m^{-} / m^{+} = 1.459 (2)$ and find $σ / m^{+} = 0.2648 (2)$ , where $σ$ is the string tension between a static quark and antiquark.
Comments:
5 pages main text, 5 figures; 23 pages Supplementary Material
Subjects:
High Energy Physics — Lattice (hep-lat); Strongly Correlated Electrons (cond-mat.str-el); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2603.01215 [pdf]
4 citations
16
[Submitted on 2 Mar 2026] (cross-list from physics.atom-ph)
Probing a Fifth Force in Muonic Atoms through Lamb Shifts and Hyperfine Structure
Xiaoxuan Lin · Qian Wu · Wei Kou · Xurong Chen
Motivated by the ATOMKI anomalies in 8Be and 4He transitions, we study X17-induced Lamb shifts and hyperfine splittings in muonic atoms with stable nuclei up to Z <= 15. The bound-state problem is solved within the Gaussian Expansion Method using a unified Hamiltonian that includes the standard electromagnetic baseline together with vector and pseudoscalar X17 exchange. The spin-independent Lamb shift is described by a coherent vector muon-nucleus interaction, while the spin-dependent hyperfine sector is built isotope by isotope from shell-model spin fractions. We find a clear complementarity between mediator hypotheses: the vector Lamb-shift signal grows toward heavier nuclei, the vector hyperfine scenario favors odd-N nuclei, and the pseudoscalar scenario favors odd-Z nuclei. Using a signal-to-precision ratio, we identify muonic deuterium, muonic helium-3 ion, and muonic helium-4 ion as the most promising near-term Lamb-shift probes among systems with existing precision benchmarks. For future spectroscopy, the largest vector Lamb-shift signal is predicted in muonic silicon-29, while the leading 1S hyperfine targets are silicon-29 for the vector scenario and phosphorus-31 for the pseudoscalar scenario. The main theoretical uncertainty comes from the Schmidt-model treatment of nuclear spin content.
Comments:
22 pages, 6 figures, 13 tables
Subjects:
Atomic Physics (physics.atom-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2603.01429 [pdf]
2 citations
17
[Submitted on 2 Mar 2026] (cross-list from hep-ph)
Threshold Cusp Structures in the Presence of Isospin Symmetry Breaking
Katsuyoshi Sone🇯🇵 · Tetsuo Hyodo🇯🇵
We study the behavior of the cusp structures focusing on the isospin-breaking effects. The properties of the near-threshold exotic hadrons are encoded in the shapes of the cusp structures. In hadron scattering, it is often the case that the thresholds of isospin partner channels are located within a narrow energy region. To analyze the scattering in such systems, it is therefore essential to study the cusp structures that emerge at two closely separated thresholds with isospin symmetry breaking. In this study, we propose a practical representation of the scattering amplitude and show that the two neighboring cusp structures are related through the isospin symmetry.
Comments:
6 pages, 2 figures, Proceedings of 15th International Conference on Hypernuclear and Strange Particle Physics (HYP2025), 29th September-3rd October, 2025
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2603.01518 [pdf]
1 citation
18
[Submitted on 2 Mar 2026] (cross-list from hep-lat)
Spatially inhomogeneous confinement-deconfinement phase transition in accelerated gluodynamics
Victor V. Braguta🇷🇺 · Vladimir A. Goy🇷🇺 · Jayanta Dey🇷🇺 · Artem A. Roenko🇷🇺
This study explores confinement-deconfinement transition properties of SU( $3$ ) Yang--Mills theory under weak accelerations at finite temperatures, using first-principles lattice simulations. The system is formulated in the Rindler spacetime, and the properties are studied from the perspective of a co-accelerating observer situated at the center of the lattice. We found that spatially separated confinement and deconfinement phases can coexist in the Rindler spacetime within certain intervals of temperature and acceleration. The position of the boundary between the phases is calculated as a function of temperature for several accelerations, and it is in accordance with the TE prediction, although a small deviation is observed. Moreover, in the weak acceleration regime, the critical temperature of the system is found to coincide with that of non-accelerated gluodynamics.
Comments:
10 pages, 4 figures, Proceedings of the 42nd International Symposium on Lattice Field Theory (Lattice 2025), 2-8 November 2025, Tata Institute of Fundamental Research, Mumbai, India
Subjects:
High Energy Physics — Lattice (hep-lat); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2603.01754 [pdf]
PoS(2026)·1 citation
19
[Submitted on 2 Mar 2026] (cross-list from hep-ph)
Effective degrees of freedom, trace anomaly and c-theorem like condition in the hadron resonance gas model
Hiroaki Kouno🇯🇵 · Riki Oshima🇯🇵 · Kouji Kashiwa🇯🇵
The relation between the effective degrees of freedom (EDOF) and the trace anomaly is studied in the hadron resonance gas (HRG) model. If we regard the thermodynamical relation as the evolution equation and define the EDOF as P/T^4, where P and T are the pressure and the temperature, respectively, we obtain the equation which relates to the trace anomaly. The structure of the equation resembles that of the so-called c-theorem, which asserts that the EDOF should not increase as the energy scale parameter decreases, in the two dimensional conformal field theory. There is a stationary point where the trace anomaly (modified trace anomaly) vanishes, and the scale symmetry is restored. To investigate the limiting temperature of the HRG model with the excluded volume effects, we consider two types of the c-theorem like conditions for the EDOF. The first condition requires that the EDOF should not decrease when T increases. This condition is equivalent to the condition that the trace anomaly (modified trace anomaly) should not be negative. The second condition requires that the EDOF should be convex downwards as a function of T. It is found that the first condition gives the limiting temperature of the HRG model with the excluded volume effect which is much higher than the crossover transition temperature obtained by the lattice QCD calculation and, at zero baryon number density, is close to the transition temperature in the pure gluonic theory, while the second one gives the limiting temperature which almost coincides with the one obtained by using the normalized baryon number fluctuation in the previous study and is consistent with the critical point predicted by the lattice QCD calculation.
Comments:
11pages, 17 figures. (v2) 12 pages, 18 figure. Fig. 18 has been newly added. Some sentences have been added. Some sentences have been improved
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2603.02085 [pdf]
0 citations

Affiliations

first authorsco-authorsvia INSPIRE