Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2010-11-15
Mod.Phys.Lett.A26:2149-2158,2011
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
8 pages; corrected typos; sections structure revised
Scientific paper
10.1142/S0217732311036516
We give an interpretation of the temperature in de Sitter universe in terms of a dynamical Unruh effect associated with the Hubble sphere. As with the quantum noise perceived by a uniformly accelerated observer in static space-times, observers endowed with a proper motion can in principle detect the effect. In particular, we study a "Kodama observer" as a two-field Unruh detector for which we show the effect is approximately thermal. We also estimate the back-reaction of the emitted radiation and find trajectories associated with the Kodama vector fields are stable.
Acquaviva Giovanni
Casadio Roberto
Chiodini S.
Criscienzo R. di
Orlandi Alberto
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