Direction-dependent Jeans instability in an anisotropic Bianchi type I space-time
| dc.creator | Dulaney, Timothy R. | |
| dc.creator | Gresham, Moira I. | |
| dc.date | 2008-05-08 | |
| dc.date | 2008-05-21 | |
| dc.date.accessioned | 2026-07-07T09:39:49Z | |
| dc.date.available | 2026-07-07T09:39:49Z | |
| dc.description | We derive the metric for a Bianchi type I space-time with energy density that is dominated by that of a perfect fluid with equation of state $p=wρ$ and whose anisotropy is seeded by a fixed norm spacelike vector field. We solve for the evolution of perturbations about this space-time. In particular, the Jeans instability in an expanding flat Friedmann-Robertson-Walker universe is modified by the presence of the vector field so that energy density perturbations develop direction-dependent growth. We also briefly consider observational limits on the vector field vacuum expectation value, $m$. We find that, if $m$ is constant during recombination and thereafter, $m \lesssim 10^{14} GeV$. | |
| dc.description | 11 pages, two column; references and new section on observational limits added, typos corrected and clarifications made in text | |
| dc.identifier | https://arxiv.org/abs/0805.1078 | |
| dc.identifier | http://arxiv.org/abs/0805.1078 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/161315 | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.title | Direction-dependent Jeans instability in an anisotropic Bianchi type I space-time | |
| dc.type | text |