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General Relativity and Quantum Cosmology

arXiv:0711.0193 (gr-qc)
[Submitted on 1 Nov 2007 (v1), last revised 6 Apr 2008 (this version, v2)]

Title:Upper and Lower Bounds on Gravitational Entropy

Authors:Paul H. Frampton, Thomas W. Kephart
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Abstract: The entropy in the interior of the Universe has many contributions including well understood ones from radiation and relic neutrinos. The gravitational entropy is larger and more subtle. One contribution which provides our lower bound is from supermassive black holes at the centers of galaxies. The remainder is harder to pin down. We suggest an upper bound which is many orders of magnitude below the holographic bound yet above that of the supermassive black holes. We propose that gravitational entropy in dark matter halos is the largest contributor to the present entropy of the universe.
Comments: 10 pages LaTeX. Minor corrections
Subjects: General Relativity and Quantum Cosmology (gr-qc)
Cite as: arXiv:0711.0193 [gr-qc]
  (or arXiv:0711.0193v2 [gr-qc] for this version)
  https://doi.org/10.48550/arXiv.0711.0193
Journal reference: JCAP0806:008,2008
Related DOI: https://doi.org/10.1088/1475-7516/2008/06/008

Submission history

From: Paul Frampton [view email]
[v1] Thu, 1 Nov 2007 19:23:51 UTC (10 KB)
[v2] Sun, 6 Apr 2008 18:51:50 UTC (9 KB)
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