Matter sources for a Null Big Bang
| dc.creator | Bronnikov, K. A. | |
| dc.creator | Zaslavskii, O. B. | |
| dc.date | 2007-10-30 | |
| dc.date | 2008-04-07 | |
| dc.date.accessioned | 2026-07-07T11:38:26Z | |
| dc.date.available | 2026-07-07T11:38:26Z | |
| dc.description | We consider the properties of stress-energy tensors compatible with a Null Big Bang, i.e., cosmological evolution starting from a Killing horizon rather than a singularity. For Kantowski-Sachs cosmologies, it is shown that if matter satisfies the Null Energy Condition (NEC), then (i) regular cosmological evolution can only start from a Killing horizon, (ii) matter is absent at the horizon, and (iii) matter can only appear in the cosmological region due to interaction with vacuum. The latter is understood phenomenologically as a fluid whose stress tensor is insensitive to boosts in a particular direction. We also argue that matter is absent in a static region beyond the horizon. All this generalizes the observations recently obtained for a mixture of dust and a vacuum fluid. If, however, we admit the existence of phantom matter, its certain special kinds (with the parameter $w \leq -3$) are consistent with a Null Big Bang without interaction with vacuum (or without vacuum fluid at all). Then in the static region there is matter with $w\geq -1/3$. Alternatively, the evolution can begin from a horizon in an infinitely remote past, leading to a scenario combining the features of a Null Big Bang and an emergent universe. | |
| dc.description | 5 two-column pages, revtex4, no figures. One reference corrected. Final version accepted for publication in Class. Quantum Grav | |
| dc.identifier | https://arxiv.org/abs/0710.5618 | |
| dc.identifier | http://arxiv.org/abs/0710.5618 | |
| dc.identifier | Class.Quant.Grav.25:105015,2008 | |
| dc.identifier | doi:10.1088/0264-9381/25/10/105015 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/199561 | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | Astrophysics | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Matter sources for a Null Big Bang | |
| dc.type | text |