Work

Quasiparticle hydrodynamics with momentum-dependent relaxation time

Year: 2025

Type: article

Abstract: We formulate the relativistic dissipative hydrodynamics of a system of quasiparticles from the Boltzmann equation within the ambit of relaxation time approximation with modified collision kernels. We focus on two specific scenarios with single quasiparticle species, (i) the extended relaxation time approximation, and (ii) the novel relaxation time approximation. We find that both approaches lead to equivalent results up to first order in spacetime gradients. We generalize the extended relaxation time approach to incorporate multiple quasiparticle species and obtain the corresponding expressions for the shear ( η s ) and bulk ( ζ s ) viscous coefficients. As an application, we study the temperature dependence of the transport coefficients of hot QCD medium with quasigluon and (light and strange) quasiquark sectors considering the power law ansatz for the momentum dependence of the relaxation time. We explore the impact of the power law exponent on the ratio ζ s / η s . Our study suggests that in comparison to a constant exponent, a temperature dependent exponent in the power law ansatz is more suitable for modeling the quasiparticle dynamics in the relevant temperature regime of heavy ion collision.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/nkx2-bxys

Authors: Arghya Mukherjee, Samapan Bhadury, Pracheta Singha

Institutions: Ramakrishna Mission Residential College, Jagiellonian University, West University of Timişoara

Language: English

Topic: High-Energy Particle Collisions Research

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Ministerul Cercetării, Inovării şi Digitalizării, Uniwersytet Jagielloński w Krakowie, NextGenerationEU

Awards: G1135825670, G1557039642, G2765557750, G8905049767