Issue |
EPL
Volume 138, Number 3, May 2022
|
|
---|---|---|
Article Number | 39001 | |
Number of page(s) | 6 | |
Section | Gravitation, cosmology and astrophysics | |
DOI | https://doi.org/10.1209/0295-5075/ac3f52 | |
Published online | 24 May 2022 |
Non-extensive statistical mechanics and the thermodynamic stability of FRW universe
School of Physics and Astronomy, University of Nottingham - Nottingham NG7 2RD, UK and Nottingham Centre of Gravity, University of Nottingham - Nottingham NG7 2RD, UK
(a) Yang.Liu@nottingham.ac.uk (corresponding author)
Received: 25 August 2021
Accepted: 2 December 2021
In this article, we investigate the thermodynamic stability of the FRW universe for two examples, Tsallis entropy and loop quantum gravity, by considering non-extensive statistical mechanics. The heat capacity, free energy and pressure of the universe are obtained. For the Tsallis entropy model, we obtained the constraint for β, namely, . The free energy of a thermal equilibrium universe must be less than zero. We suggest that the reason for the accelerated expansion of the universe is not because of Tsallis entropy. Similar results are obtained for loop quantum gravity. However, since the values of
and q cannot be determined in this model, the results become more subtle than that in the Tsallis entropy model. In addition, we compare the results for the universe with those for a Schwarzschild black hole.
© 2022 The author(s)
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