Abstract

We compare the latest cosmic microwave background data with theoretical predictions including correlated adiabatic and cold dark matter (CDM) isocurvature perturbations with a simple power-law dependence. We find that there is a degeneracy between the amplitude of correlated isocurvature perturbations and the spectral tilt. A negative (red) tilt is found to be compatible with a larger isocurvature contribution. Estimates of the baryon and CDM densities are found to be almost independent of the isocurvature amplitude. The main result is that current microwave background data do not exclude a dominant contribution from CDM isocurvature fluctuations on large scales.

Keywords

PhysicsCosmic microwave backgroundAmplitudeInflation (cosmology)Adiabatic processSpectral densityBaryonAstrophysicsDegeneracy (biology)COSMIC cancer databaseCold dark matterPrimordial fluctuationsCosmic background radiationCosmologyAstronomyQuantum mechanicsAnisotropy

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Publication Info

Year
2002
Type
article
Volume
88
Issue
21
Pages
211302-211302
Citations
114
Access
Closed

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Cite This

Luca Amendola, Chris Gordon, David Wands et al. (2002). Correlated Perturbations from Inflation and the Cosmic Microwave Background. Physical Review Letters , 88 (21) , 211302-211302. https://doi.org/10.1103/physrevlett.88.211302

Identifiers

DOI
10.1103/physrevlett.88.211302