Volume 14, Issue 4 (Iranian Journal of Physics Research,Winter 2015)                   IJPR 2015, 14(4): 293-303 | Back to browse issues page

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Aghaei Abchouyeh M, Mirza B, Nadi H. Investigating the little rip and other future singularities of the universe, and validity of the second law of thermodynamics in F(R) theory . IJPR. 2015; 14 (4) :293-303
URL: http://ijpr.iut.ac.ir/article-1-1717-en.html
Department of Physics, Isfahan University of Technology, Isfahan, Iran , m.aghaei@ph.iut.ac.ir
Abstract:   (4547 Views)
The future singularities are possible in a universe that is described by F(R) theory. In previous studies the occurrence of the singularities in F(R) theory have been considered by using a special function for the Hubble parameter and calculating the F(R) function for each of the singularities. Using the specified Hubble parameter causes some difficulties in the study of the second law of thermodynamics. In this paper by using the scale factor, the behavior of F(R) function near each type of the singularities is considered. We can check the validity of the second law of thermodynamics near the singularities. At first we study the Little Rip and then the other types of singularities are considered. The results show that the second law of thermodynamics is satisfied near the singularity type (I) with some special conditions and is violated with some other conditions. it is satisfied near the Little Rip, type (II), (III) and (IV) singularities
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Type of Study: Research | Subject: General

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