Physics – High Energy Physics – High Energy Physics - Theory

Scientific paper

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2003-02-19

Phys.Rev. D67 (2003) 124014

Physics

High Energy Physics

High Energy Physics - Theory

19 pages, 1 figure

Scientific paper

10.1103/PhysRevD.67.124014

We consider a massive scalar field with arbitrary coupling in $\mathbf{S}^{1}\times \mathbf{S}^{3}$ space, which mimics the thermal expanding universe, and calculate explicitly all relevant thermodynamical functions in the low- and high-temperature regimes, extending previous analysis of entropy bounds and entropy/energy ratios performed in the conformal case. For high temperatures, new mass-dependent entropy ratios are established which, differently to the conformal limit, fulfil Bekenstein's and Verlinde's bounds in the physical region.

**Elizalde Emilio**

Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology

Scientist

**Tort Alexandre C.**

Physics – Quantum Physics

Scientist

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