Entropy of Microwave Background Radiation in Observable Universe

Abstract

We show that the cosmological constant at late time places a bound on the entropy of microwave background radiation deposited in the future event horizon of a given observer, $S\le S_{{\Lambda }_0}^{3/4}$. This bound is independent of the energy scale of reheating and the FRW evolution after reheating. We also discuss why the entropy of microwave background in our observable universe has its present value.

arXiv comment3 pages, no figures, revised version to publish in PRD brief report

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• Validity of Generalized Second Law of Thermodynamics in the Logamediate and Intermediate scenarios of the Universe
• Holographic bounds and finite inflation
• Thermodynamic Behavior of Time-Dependent Wormholes in Palatini $f(R)$ Gravity