TL;DR
This paper explores how modifications to general relativity affect horizon entropy and discusses potential conceptual issues in such models, assuming gravity's thermodynamical nature remains valid.
Contribution
It derives a modified horizon entropy formula from altered Friedmann equations in four-dimensional gravity models, highlighting conceptual challenges.
Findings
Modified entropy formula derived from altered Friedmann equations
Identification of conceptual problems in some modified gravity models
Assumption that thermodynamical nature of gravity persists in modifications
Abstract
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.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.