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 spacetimes, 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 field are stable.

On the Unruh effect in de Sitter space

CASADIO, ROBERTO;ORLANDI, ALESSIO;CHIODINI, STEFANO
2011

Abstract

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 spacetimes, 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 field are stable.
R. Casadio; S. Chiodini; A. Orlandi; G. Acquaviva; R. Di Criscienzo; L. Vanzo
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/105001
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