Naslov
Avoiding Boltzmann Brain domination in holographic dark energy models

Autori
Horvat, Raul

Izvornik
Physics Letters B (0370-2693) 750 (2015); 181-183

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Dark Energy; Boltzmann Brains

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA