Non-Gaussian Correlations Outside the Horizon
| dc.creator | Weinberg, Steven | |
| dc.date | 2008-08-21 | |
| dc.date | 2008-10-18 | |
| dc.date.accessioned | 2026-07-07T12:22:29Z | |
| dc.date.available | 2026-07-07T12:22:29Z | |
| dc.description | It is shown that under essentially all conditions, the non-linear classical equations governing gravitation and matter in cosmology have a solution in which far outside the horizon in a suitable gauge the reduced spatial metric (the spatial metric divided by the square of the Robertson--Walker scale factor $a$) is time-independent, though with an arbitrary dependence on co-moving coordinates, and all perturbations to the other metric components and to all matter variables vanish, to leading order in $1/a$. The corrections are of order $1/a^2$, and are explicitly given for the reduced metric in a multifield model with a general potential. Further, this is the solution that describes the metric and matter produced by single-field inflation. These results justify the use of observed non-Gaussian correlations (or their absence) as a test of theories of single-field inflation, despite our ignorance of the constituents of the universe while fluctuations are outside the horizon after inflation, as long as graphs with loops can be neglected. | |
| dc.description | 25 pages. This version clarifies the scale transformation used in Section II and the gauge transformation used in Section III, and corrects some typos, including new typos introduced in version 2 | |
| dc.identifier | https://arxiv.org/abs/0808.2909 | |
| dc.identifier | http://arxiv.org/abs/0808.2909 | |
| dc.identifier | Phys.Rev.D78:123521,2008 | |
| dc.identifier | doi:10.1103/PhysRevD.78.123521 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/213667 | |
| dc.subject | High Energy Physics - Theory | |
| dc.subject | Astrophysics | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.title | Non-Gaussian Correlations Outside the Horizon | |
| dc.type | text |