Cosmological evolution of the gravitational entropy of the large-scale structure

Giovanni Marozzi, Jean-Philippe Uzan, Obinna Umeh, Chris Clarkson

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Abstract

We consider the entropy associated with the large-scale structure of the Universe in the linear regime, where the Universe can be described by a perturbed Friedmann-Lema\^itre spacetime. In particular, we compare two different definitions proposed in the literature for the entropy using a spatial averaging prescription. For one definition, the entropy of the large-scale structure for a given comoving volume always grows with time, both for a CDM and a $\Lambda$CDM model. In particular, while it diverges for a CDM model, it saturates to a constant value in the presence of a cosmological constant. The use of a light-cone averaging prescription in the context of the evaluation of the entropy is also discussed.
Original languageEnglish
Article number114
JournalGeneral Relativity and Gravitation
Volume47
Issue number10
DOIs
Publication statusPublished - 5 Sep 2015

Keywords

  • gr-qc
  • astro-ph.CO
  • hep-th

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