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On the Unruh effect in de Sitter space

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arxiv 1011.3336 v2 pith:MTRL3WKX submitted 2010-11-15 gr-qc

R. Casadio , S. Chiodini , A. Orlandi , G. Acquaviva , R. Di Criscienzo , L. Vanzo This is my paper · ORCID
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keywords effectunruhassociatedkodamaobserversitteracceleratedapproximately
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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.

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