On the Unruh effect in de Sitter space

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 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.

8 pages; corrected typos; sections structure revised

References in corpus (5)

• Fermion Tunneling from Dynamical Horizons
• On the Hawking radiation as tunneling for a class of dynamical black holes
• Kodama time: Geometrically preferred foliations of spherically symmetric spacetimes
• The generalized second law of thermodynamics in generalized gravity theories
• Thermodynamics for Kodama observer in general spherically symmetric spacetimes

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• Quantifying Quantumness in (A)dS spacetimes with Unruh-DeWitt Detector
• Quantum detectors in generic non flat FLRW space-times
• Neutral Massive Spin 1/2 Particles Emission in a Rindler Spacetime
• Time dependent particle production and particle number in cosmological de Sitter space
• Late-time quantum radiation by a uniformly accelerated detector in de Sitter spacetime
• Vacuum fluctuation of conformally coupled scalar field in FLRW space-times
• Unruh-DeWitt detector and the interpretation of the horizon temperature in spherically symmetric dynamical space-times
• Geometric aspects of covariant Wick rotation