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Avoiding Boltzmann Brain domination in holographic dark energy models

Horvat, Raul (2015) Avoiding Boltzmann Brain domination in holographic dark energy models. Physics Letters B, 750 . pp. 181-183. ISSN 0370-2693

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In a spatially infinite and eternal universe approaching ultimately a de Sitter (or quasi-de Sitter) regime, structure can form by thermal fluctuations as such a space is thermal. The models of Dark Energy invoking holographic principle fit naturally into such a category, and spontaneous formation of isolated brains in otherwise empty space seems the most perplexing, creating the paradox of Boltzmann Brains (BB). It is thus appropriate to ask if such models can be made free from domination by Boltzmann Brains. Here we consider only the simplest model, but adopt both the local and the global viewpoint in the description of the Universe. In the former case, we find that if a dimensionless model parameter c , which modulates the Dark Energy density, lies outside the exponentially narrow strip around the most natural c=1c=1 line, the theory is rendered BB-safe. In the latter case, the bound on c is exponentially stronger, and seemingly at odds with those bounds on c obtained from various observational tests.

Item Type: Article
Uncontrolled Keywords: Dark Energy; Boltzmann Brains
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Towards quantum gravity: noncomutative geometry, field theory and cosmologyMeljanac, StjepanIP-2014-09-9582HRZZ
Depositing User: Raul Horvat
Date Deposited: 25 Apr 2016 09:04
DOI: 10.1016/j.physletb.2015.09.008

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