We discuss the creation of massless particles in a Universe, which transits from a radiation-dominated era to any other expansion law. We calculate in detail the generation of gravitons during the transition to a matter-dominated era. We show that the resulting gravitons generated in the standard radiation/matter transition are negligible. We use our result to constrain one or more previous matter-dominated era, or any other expansion law, which may have taken place in the early Universe. We also derive a general formula for the modification of a generic initial graviton spectrum by an early matter-dominated era. © 2009 The American Physical Society.
Titolo: | Graviton production in noninflationary cosmology |
Autori: | Durrer, R.; Rinaldi, Massimiliano |
Autori Unitn: | |
Titolo del periodico: | PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY |
Anno di pubblicazione: | 2009 |
Numero e parte del fascicolo: | 6 |
Codice identificativo Scopus: | 2-s2.0-63249093544 |
Codice identificativo ISI: | WOS:000264762500023 |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevD.79.063507 |
Handle: | http://hdl.handle.net/11572/106033 |
Appare nelle tipologie: | 03.1 Articolo su rivista (Journal article) |
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