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 / R. Casadio; S. Chiodini; A. Orlandi; G. Acquaviva; R. Di Criscienzo; L. Vanzo. - In: MODERN PHYSICS LETTERS A. - ISSN 0217-7323. - STAMPA. - 26:(2011), pp. 2149-2158. [10.1142/S0217732311036516]
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
