Lensed Cosmic Microwave Background Constraints on Post-General Relativity Parameters

Details Lensed Cosmic Microwave Background Constraints on Post-General Relativity Parameters Lensed Cosmic Microwave Background Constraints on Post-General Relativity Parameters

2009-01-07

arxiv.org/abs/0901.0917v1

Phys.Rev.D79:101301,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevD.79.101301

The constraints on departures from general relativity (GR) at cosmological length scales due to cosmic microwave background (CMB) data are discussed. The departure from GR is measured by the ratio, parameterized as $1 +\varpi_0 (1 + z)^{-S}$, between the gravitational potentials conventionally appearing in the geodesic equation and the Poisson equation. Current CMB data indicate $\varpi_0=1.67^{+3.07}_{-1.87}$ at the 2$\sigma$ confidence level, while $S$ remains unconstrained. The departure from GR affects the lensing conversion of E-mode into B-mode polarization. Hence, the lensing measurements from a future CMBpol experiment should be able to improve the constraints to $\varpi_0< 0.30$ for a fiducial $\varpi_0=0$ model and independent of $S$.

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