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- W4200202234 abstract "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 $beta$, namely, $1/2 < beta < 2$. 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 due to Tsallis entropy. Similar results are obtained for loop quantum gravity. However, since the values of $Lambda(gamma)$ 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." @default.
- W4200202234 created "2021-12-31" @default.
- W4200202234 creator A5027947714 @default.
- W4200202234 date "2022-05-01" @default.
- W4200202234 modified "2023-09-28" @default.
- W4200202234 title "Non-extensive statistical mechanics and the thermodynamic stability of FRW universe" @default.
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- W4200202234 doi "https://doi.org/10.1209/0295-5075/ac3f52" @default.
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