Phys. Rev. D 72, 024030 (2005) [4 pages]Horizon entropy in modified gravityReceived 31 May 2005; published 28 July 2005 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.72.024030
DOI:
10.1103/PhysRevD.72.024030
PACS:
04.50.+h, 98.80.Jk
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