Horizon Entropy in Modified Gravity

Details Horizon Entropy in Modified Gravity Horizon Entropy in Modified Gravity

2005-07-08

arxiv.org/abs/gr-qc/0507034v2

Phys.Rev. D72 (2005) 024030

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages. v2: references added

Scientific paper

10.1103/PhysRevD.72.024030

We present an observation about the proposal that four-dimensional modification of general relativity may explain the observed cosmic acceleration today. Assuming that the thermodynamical nature of gravity theory continues to hold in modified gravity theories, we derive the modified horizon entropy formula from the modified Friedmann equation. We argue that our results imply that there are conceptual problems in some models of four-dimensional modification of general relativity.

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