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  • Letter
  • Open Access

Quasiparticle cosmology

Amaresh Jaiswal*

  • School of Physical Sciences, National Institute of Science Education and Research, An OCC of Homi Bhabha National Institute, Jatni-752050, India

  • *a.jaiswal@niser.ac.in
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Phys. Rev. D 109, L081301 – Published 29 April, 2024

DOI: https://doi.org/10.1103/PhysRevD.109.L081301

Abstract

We consider thermodynamics of the Universe within a quasiparticle approach where the collective dynamics of a system is governed by the thermal mass of the constituents. The spacetime dependence of this thermal mass leads to a negative contribution to the pressure and a positive contribution to the energy density, similar to the effect due to dark energy. We propose a mechanism based on thermodynamic arguments to quantify this contribution from the thermal vacuum of the system. For a sufficiently large spacetime variation of the thermal mass, the effective pressure can become negative and could mimic a dark energy equation of state. We validate our framework using results from renormalizable interacting scalar field theory and demonstrate an application on QCD axion.

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Phys. Rev. D 109, L081301– Published 29 April, 2024
  • Received 19 August 2023
  • Accepted 10 April 2024
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