CINECA IRIS Institutional Research Information System
IRIS è l'Anagrafe della ricerca dell'Università degli Studi di Trento, e ha lo scopo di raccogliere, documentare, conservare e diffondere, anche ad accesso aperto, la produzione scientifica degli autori afferenti all'Università degli Studi di Trento.
EnglishIn the present paper, Unruh–DeWitt detectors are used in order to investigate the issue of temperature associated with a spherically symmetric dynamical space-times. Firstly, we review the semi-classical tunneling method, then we introduce the Unruh–DeWitt detector approach. We show that for the generic static black hole case and the FRW de Sitter case, making use of peculiar Kodama trajectories, semiclassical and quantum field theoretic techniques give the same standard and well known thermal interpretation, with an associated temperature, corrected by appropriate Tolman factors. For a FRW space-time interpolating de Sitter space with the Einstein–de Sitter universe (that is a more realistic situation in the frame of ΛCDM cosmologies), we show that the detector response splits into a de Sitter contribution plus a fluctuating term containing no trace of Boltzmann-like factors, but rather describing the way thermal equilibrium is reached in the late time limit. As a consequence, and unlike the case of black holes, the identification of the dynamical surface gravity of a cosmological trapping horizon as an effective temperature parameter seems lost, at least for our co-moving simplified detectors. The possibility remains that a detector performing a proper motion along a Kodama trajectory may register something more, in which case the horizon surface gravity would be associated more likely to vacuum correlations than to particle creation.
Scheda prodotto non validato
I dati visualizzati non sono stati ancora sottoposti a validazione formale da parte dello Staff di IRIS, ma sono stati ugualmente trasmessi al Sito Docente Cineca (Loginmiur).
| Titolo: | Unruh–DeWitt Detectors in Spherically Symmetric Dynamical Space-Times |
| Autori: | Acquaviva, Giovanni; Di Criscienzo, Roberto; M., Tolotti; Vanzo, Luciano; Zerbini, Sergio |
| Autori Unitn: | |
| Titolo del periodico: | INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS |
| Anno di pubblicazione: | 2012 |
| Numero e parte del fascicolo: | 5 |
| Codice identificativo Scopus: | 2-s2.0-84859595735 |
| Codice identificativo ISI: | WOS:000302693400026 |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1007/s10773-011-1033-2 |
| Handle: | http://hdl.handle.net/11572/89981 |
| Appare nelle tipologie: | 03.1 Articolo su rivista (Journal article) |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| 1111.6389.pdf | Altro materiale allegato (Other attachments) | Altra licenza (Other type of license) | Administrator |
http://hdl.handle.net/11572/89981
Copyright © 2020