Limits on anisotropy and inhomogeneity from the cosmic background radiation
- 15 February 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 51 (4) , 1525-1535
- https://doi.org/10.1103/physrevd.51.1525
Abstract
We consider directly the equations by which matter imposes anisotropies on freely propagating background radiation, leading to a new way of using anisotropy measurements to limit the deviations of the Universe from a Friedmann-Robertson-Walker (FRW) geometry. This approach is complementary to the usual Sachs-Wolfe approach: the limits obtained are not as detailed, but they are more model independent. We also give new results about combined matter-radiation perturbations in an almost-FRW universe, and a new exact solution of the linearized equations.Keywords
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This publication has 27 references indexed in Scilit:
- The cosmic microwave background radiation and cosmologyClassical and Quantum Gravity, 1994
- Anisotropy in the microwave sky at intermediate angular scalesThe Astrophysical Journal, 1994
- Comments on the statistical analysis of excess variance in the COBE differential microwave radiometer mapsThe Astrophysical Journal, 1994
- A degree-scale measurement of anisotropy of the cosmic background radiationThe Astrophysical Journal, 1992
- Structure in the COBE differential microwave radiometer first-year mapsThe Astrophysical Journal, 1992
- Covariant perturbations in a multifluid cosmological mediumThe Astrophysical Journal, 1992
- Density-gradient-vorticity relation in perfect-fluid Robertson-Walker perturbationsPhysical Review D, 1990
- Covariant and gauge-invariant approach to cosmological density fluctuationsPhysical Review D, 1989
- Gauge-invariant cosmological perturbationsPhysical Review D, 1980
- Perturbations of an Expanding UniverseThe Astrophysical Journal, 1966