Cosmological Imprint of the Second Law of Thermodynamics

Details Cosmological Imprint of the Second Law of Thermodynamics Cosmological Imprint of the Second Law of Thermodynamics

2008-04-16

arxiv.org/abs/0804.2579v2

JCAP0808:035,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

18pages, 2 figures,

Scientific paper

10.1088/1475-7516/2008/08/035

We study the evolution of the universe in the presence of inflaton, matter, radiation, and holographic dark energy. The time evolution of the scale factor is obtained by solving the Friedmann equation of the universe with a good approximation. We present two independent ways which determine the value of the dark energy constant $d\sim 1$ from the observational data. The two ways are measuring the deceleration parameter and measuring a universal constant depending only on $d$. The universal constant is given by a dimensionless combination of three scale factors at the equipartition times of radiation-matter, radiation-dark energy, and matter-dark energy. We also discuss that the second law of thermodynamics determines the point of time when the dark energy dominated era begins in the universe.

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