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...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
American Physical Society
2013
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| Sorozat: | PHYSICAL REVIEW D
88 No. 2 |
| doi: | 10.1103/PhysRevD.88.023535 |
| mtmt: | 2407750 |
| Online Access: | http://publicatio.bibl.u-szeged.hu/8187 |
| 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. |
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| Terjedelem/Fizikai jellemzők: | Terjedelem: 12 p.-Azonosító: 023535 |
| ISSN: | 1550-7998 |