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Nuclear Theory·nucl-th

Friday·December 11, 2020

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 03

    The neutron star inner crust: an empirical essay

    Luiz L. Lopes🇧🇷

    In this work we study how the small contribution of the inner crust to the total equation of state (EoS) of a neutron star affects its mass-radius relation, focusing on the canonical mass of 1.4. We build empirical EoS of the kind - - in the range of 0.003 fm0.08 fm and also calculate the speed of sound in this region. We see that different behaviours of the speed of sound can affect the radius of the canonical star by more than 1.1 km. This result can help us understand extreme results as GW170817, where some studies indicate that the radius of the canonical star cannot exceed 11.9 km.

    ↳ hep-phastro-ph.HEnucl-thEPL(2021)·14 citations
  2. 04

    Quantum fluctuations of energy in subsystems of a hot relativistic gas

    Arpan Das🇵🇱 · Wojciech Florkowski🇵🇱 · Radoslaw Ryblewski🇵🇱 · Rajeev Singh🇵🇱

    We derive a formula that defines quantum fluctuations of energy in subsystems of a hot relativistic gas. For small subsystem sizes we find substantial increase of fluctuations compared to those known from standard thermodynamic considerations. However, if the size of the subsystem is sufficiently large, we reproduce the result for energy fluctuations in the canonical ensemble. Our results are subsequently used in the context of relativistic heavy-ion collisions to introduce limitations of the concepts such as classical energy density or fluid element. In the straightforward way, our formula can be applied in other fields of physics, wherever one deals with hot and relativistic matter.

    ↳ hep-phhep-thnucl-thActa Phys.Polon.B(2021)·10 citations
  3. 05

    Finite Size Effects on the Chiral Phase Transition of Quantum Chromodynamics

    Shen-Song Wan🇨🇳 · Daize Li🇨🇳 · Bonan Zhang🇨🇳 · Marco Ruggieri🇨🇳

    We study the effect of periodic boundary conditions on chiral symmetry breaking and its restoration in Quantum Chromodynamics. As an effective model of the effective potential for the quark condensate, we use the quark-meson model, while the theory is quantized in a cubic box of size . After specifying a renormalization prescription for the vacuum quark loop, we study the condensate at finite temperature, , and quark chemical potential, . We find that lowering leads to a catalysis of chiral symmetry breaking. The excitation of the zero mode leads to a jump in the condensate at low temperature and high density, that we suggest to interpret as a gas-liquid phase transition that takes place between the chiral symmetry broken phase (hadron gas) and chiral symmetry restored phase (quark matter). We characterize this intermediate phase in terms of the increase of the baryon density, and of the correlation length of the fluctuations of the order parameter: for small enough the correlation domains occupy a substantial portion of the volume of the system, and the fluctuations are comparable to those in the critical region. For these reasons, we dub this phase as the {\it subcritical liquid}. The qualitative picture that we draw is in agreement with previous studies based on similar effective models. We also clarify the discrepancy on the behavior of the critical temperature versus found in different models.

    ↳ hep-phhep-latnucl-th7 citations

Affiliations

first authorsco-authorsvia INSPIRE