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Nuclear Theory·nucl-th

Monday·December 18, 2023

14 papers—11 primary·3 cross-listed

All14Primary11Cross-lists3
  1. 12

    [Submitted on 15 Dec 2023] (cross-list from hep-ph)

    Electromagnetic probes for critical fluctuations of phase transitions in dense QCD

    Toru Nishimura🇯🇵 · Masakiyo Kitazawa🇯🇵 · Teiji Kunihiro🇯🇵

    We study how the dilepton production rates and electric conductivity are affected by the phase transition to color superconductivity and the QCD critical point. Effects of the soft modes associated with these phase transitions are incorporated through the photon self-energy called the Aslamazov-Larkin, Maki-Thompson, and density-of-states terms, which are responsible for the paraconductivity in metallic superconductors. We show that anomalous enhancements of the production rate in the low energy/momentum region and the conductivity occur around the respective critical points.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2312.09483 [pdf]
    EPJ Web Conf.(2024)·0 citations
  2. 13

    [Submitted on 15 Dec 2023] (cross-list from hep-ph)

    Study of a longitudinally expanding plasma with the 2PI effective action

    François Gelis🇫🇷 · Sigtryggur Hauksson🇫🇷

    A central question in heavy-ion collisions is how the initial far-from-equilibrium medium evolves and thermalizes while it undergoes a rapid longitudinal expansion. In this work we use the two-particle irreducible (2PI) effective action for the first time to consider this question, focusing on scalar theory truncated at three loops. We calculate the momentum distribution of quasiparticles in the medium and show that isotropization takes place. We furthermore consider the thermal mass of quasiparticles and the importance of number-changing processes.

    Comments:
    4 pages, 4 figures, conference proceedings for Quark Matter 2023
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2312.09749 [pdf]
    EPJ Web Conf.(2024)·2 citations
  3. 14

    [Submitted on 15 Dec 2023] (cross-list from astro-ph.HE)

    Causality Bounds on Dissipative General-Relativistic Magnetohydrodynamics

    Ian Cordeiro🇺🇸 · Enrico Speranza🇨🇭 · Kevin Ingles🇺🇸 · Fábio S. Bemfica🇧🇷 · Jorge Noronha🇺🇸

    We derive necessary and sufficient conditions under which a large class of relativistic generalizations of Braginskii's magnetohydrodynamics with shear, bulk, and heat diffusion effects is causal and strongly hyperbolic in the fully nonlinear regime in curved spacetime. We find that causality severely constrains the size of nonideal effects and the onset of kinetic instabilities. Our results are crucial for assessing the regime of validity of fluid dynamical simulations of plasmas near supermassive black holes.

    Comments:
    16 pages, 1 figure, includes Supplemental Material. Accepted for publication in Physical Review Letters
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th); Plasma Physics (physics.plasm-ph)
    arXiv:
    2312.09970 [pdf]
    PRL(2024)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE