Quasi-Topological Cosmology from Emergence of Cosmic Space
Ahmad Sheykhi**
Physics Department and Biruni Observatory, College of Sciences, Shiraz University, Shiraz 71454, Iran Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), P. O. Box 55134-441, Maragha, Iran
Abstract ：We show that one can always derive the Friedmann equation of an (n+ 1)-dimensional Friedmann–Robertson–Walker universe in cubic quasi-topological gravity, by determining the difference between the bulk and the apparent horizon degrees of freedom in a region of space. We also generalize the study to the higher-order quasi-topological gravity, and extract the corresponding Friedmann equation in this theory by using the same approach.
收稿日期: 2013-09-24
出版日期: 2014-02-28
:
04.20.Cv
(Fundamental problems and general formalism)
04.50.-h
(Higher-dimensional gravity and other theories of gravity)
04.70.Dy
(Quantum aspects of black holes, evaporation, thermodynamics)
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2014, Vol. 31 
