抄録
We demonstrate that it is possible to obtain a picture of equilibrium thermodynamics on the apparent horizon in the expanding cosmological background for a wide class of modified gravity theories with the Lagrangian density f(R, φ,X), where R is the Ricci scalar and X = -(∇ φ)2/2 is the kinetic energy of a scalar field φ. In this framework, the horizon entropy S corresponding to equilibrium thermodynamics is proportional to the horizon area A with a constant coefficient, as in the Einstein gravity. We show that for a flat cosmological background with a decreasing Hubble parameter, S globally increases with time.
本文言語 | English |
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ページ | 109-112 |
ページ数 | 4 |
出版ステータス | Published - 2009 |
外部発表 | はい |
イベント | 19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009 - Tokyo, Japan 継続期間: 2009 11月 30 → 2009 12月 4 |
Conference
Conference | 19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009 |
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国/地域 | Japan |
City | Tokyo |
Period | 09/11/30 → 09/12/4 |
ASJC Scopus subject areas
- 原子分子物理学および光学