Relativistic transformation of temperature for exotic cosmological fluids
Abstract
We study the relativistic transformation of temperature for effective cosmological fluids with negative pressure within a covariant thermodynamic framework. The Lorentz transformation of temperature is derived for barotropic fluids with p=wρ and for the (generalized) Chaplygin gas with p=−A/ρα. For barotropic fluids with constant negative equation-of-state parameter, we show that negative pressure suppresses the growth of temperature under relativistic boosts. In contrast, the Chaplygin gas exhibits a qualitatively different behavior due to its density-dependent pressure, leading to a monotonic increase of the transformed temperature with velocity. The dependence of the relativistic temperature on the relative velocity and background energy density is illustrated through representative examples.
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BibTeX
@misc{pouryazdan2026relativistic,
title = {{Relativistic transformation of temperature for exotic cosmological fluids}},
author = {Soroor Pouryazdan and Babak Vakili},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.03124},
eprint = {2609.03124},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.03124},
}
RIS
TY - UNPB
TI - Relativistic transformation of temperature for exotic cosmological fluids
AU - Soroor Pouryazdan
AU - Babak Vakili
PY - 2026
DA - 2026/09/02
PB - arXiv
DO - 10.48550/arxiv.2609.03124
UR - https://arxiv.org/abs/2609.03124
AB - We study the relativistic transformation of temperature for effective cosmological fluids with negative pressure within a covariant thermodynamic framework. The Lorentz transformation of temperature is derived for barotropic fluids with p=wρ and for the (generalized) Chaplygin gas with p=−A/ρ^α. For barotropic fluids with constant negative equation-of-state parameter, we show that negative pressure suppresses the growth of temperature under relativistic boosts. In contrast, the Chaplygin gas exhibits a qualitatively different behavior due to its density-dependent pressure, leading to a monotonic increase of the transformed temperature with velocity. The dependence of the relativistic temperature on the relative velocity and background energy density is illustrated through representative examples.
ER -