Interpretation of the Cosmic Microwave Background radiation anisotropy detected by the COBE differential microwave radiometer - INSPIRE

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Interpretation of the Cosmic Microwave Background radiation anisotropy detected by the COBE differential microwave radiometer

May 5, 1992

23 pages

Published in:

Astrophys.J.Lett. 396 (1992) L13-L18

DOI:

10.1086/186506

Report number:

PRINT-92-0149 (UC,BERKELEY)

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Abstract: (ADS)

The large-scale cosmic background anisotropy detected by the COBE Differential Microwave Radiometer (DMR) instrument is compared to the sensitive previous measurements on various angular scales, and to the predictions of a wide variety of models of structure formation driven by gravitational instability. The observed anisotropy is consistent with all previously measured upper limits and with a number of dynamical models of structure formation. For example, the data agree with an unbiased cold dark matter (CDM) model with H0 = 50 km/s Mpc and Delta-M/M = 1 in a 16 Mpc radius sphere. Other models, such as CDM plus massive neutrinos (hot dark matter (HDM)), or CDM with a nonzero cosmological constant are also consistent with the COBE detection and can provide the extra power seen on 5-10,000 km/s scales.

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