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Dezaki, Fatemeh Lalehgani; Mirza, Behrouz
General relativity and gravitation, 06/2015, Volume: 47, Issue: 6Journal Article
We suggest that using the first law of thermodynamics is a convenient method to obtain a correct form of the expansion law of the universe (Padmanabhan, arXiv:1206.4916 v1 hep-th). We will, then, use this idea to obtain the expansion law for a Kodama observer. By using the expansion law for a Kodama observer, we can obtain the dynamic equation of the FRW universe for deformed Horava–Lifshitz gravity. The use of the first law of thermodynamics also leads to a new approach for obtaining the Friedmann equations for f(R) and scalar tensor gravities.
