Oxidised cosmic acceleration
| dc.creator | Wesley, Daniel H. | |
| dc.date | 2008-02-21 | |
| dc.date | 2008-08-04 | |
| dc.date.accessioned | 2026-07-07T12:35:56Z | |
| dc.date.available | 2026-07-07T12:35:56Z | |
| dc.description | We give detailed proofs of several new no-go theorems for constructing flat four-dimensional accelerating universes from warped dimensional reduction. These new theorems improve upon previous ones by weakening the energy conditions, by including time-dependent compactifications, and by treating accelerated expansion that is not precisely de Sitter. We show that de Sitter expansion violates the higher-dimensional null energy condition (NEC) if the compactification manifold M is one-dimensional, if its intrinsic Ricci scalar R vanishes everywhere, or if R and the warp function satisfy a simple limit condition. If expansion is not de Sitter, we establish threshold equation-of-state parameters w below which accelerated expansion must be transient. Below the threshold w there are bounds on the number of e-foldings of expansion. If M is one-dimensional or R everywhere vanishing, exceeding the bound implies the NEC is violated. If R does not vanish everywhere on M, exceeding the bound implies the strong energy condition (SEC) is violated. Observationally, the w thresholds indicate that experiments with finite resolution in w can cleanly discriminate between different models which satisfy or violate the relevant energy conditions. | |
| dc.description | v2: corrections, references added | |
| dc.identifier | https://arxiv.org/abs/0802.3214 | |
| dc.identifier | http://arxiv.org/abs/0802.3214 | |
| dc.identifier | JCAP 0901:041,2009 | |
| dc.identifier | doi:10.1088/1475-7516/2009/01/041 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/217931 | |
| dc.subject | High Energy Physics - Theory | |
| dc.subject | Astrophysics | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.title | Oxidised cosmic acceleration | |
| dc.type | text |