Testing Gravity Against Early Time Integrated Sachs-Wolfe Effect
| dc.creator | Zhang, Pengjie | |
| dc.date | 2005-11-08 | |
| dc.date | 2006-05-12 | |
| dc.date.accessioned | 2026-07-07T11:24:57Z | |
| dc.date.available | 2026-07-07T11:24:57Z | |
| dc.description | A generic prediction of general relativity is that the cosmological linear density growth factor $D$ is scale independent. But in general, modified gravities do not preserve this signature. A scale dependent $D$ can cause time variation in gravitational potential at high redshifts and provides a new cosmological test of gravity, through early time integrated Sachs-Wolfe (ISW) effect-large scale structure (LSS) cross correlation. We demonstrate the power of this test for a class of $f(R)$ gravity, with the form $f(R)=-λ_1 H_0^2\exp(-R/λ_2H_0^2)$. Such $f(R)$ gravity, even with degenerate expansion history to $Λ$CDM, can produce detectable ISW effect at $z\ga 3$ and $l\ga 20$. Null-detection of such effect would constrain $λ_2$ to be $λ_2>1000$ at $>95%$ confidence level. On the other hand, robust detection of ISW-LSS cross correlation at high $z$ will severely challenge general relativity. | |
| dc.description | 5 pages, 2 figures. Accepted to PRD. v2: Revised to address to more general audience. v3: added discussions | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0511218 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0511218 | |
| dc.identifier | Phys.Rev.D73:123504,2006 | |
| dc.identifier | doi:10.1103/PhysRevD.73.123504 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/195364 | |
| dc.subject | Astrophysics | |
| dc.title | Testing Gravity Against Early Time Integrated Sachs-Wolfe Effect | |
| dc.type | text |