Soft singularity crossing and transformation of matter properties

We investigate particular cosmological models, based either on tachyon fields or on perfect fluids, for which soft future singularities arise in a natural way. Our main result is the description of a smooth crossing of the soft singularity in models with an anti-Chaplygin gas or with a particular ta...

Teljes leírás

Elmentve itt :
Bibliográfiai részletek
Szerzők: Keresztes Zoltán
Gergely Árpád László
Kamenshchik Alexander Yu
Gorini Vittorio
Polarski David
Dokumentumtípus: Cikk
Megjelent: American Physical Society 2013
Sorozat:PHYSICAL REVIEW D 88 No. 2
doi:10.1103/PhysRevD.88.023535

mtmt:2407750
Online Access:http://publicatio.bibl.u-szeged.hu/8187
Leíró adatok
Tartalmi kivonat:We investigate particular cosmological models, based either on tachyon fields or on perfect fluids, for which soft future singularities arise in a natural way. Our main result is the description of a smooth crossing of the soft singularity in models with an anti-Chaplygin gas or with a particular tachyon field in the presence of dust. Such a crossing is made possible by certain transformations of matter properties. Some of these cosmological evolutions involving tachyons are compatible with SNIa data. We compute numerically their dynamics involving a first soft singularity crossing, a turning point and a second soft singulatity crossing during recollapse, ending in a Big Crunch singularity.
Terjedelem/Fizikai jellemzők:Terjedelem: 12 p.-Azonosító: 023535
ISSN:1550-7998