The Cosmic Microwave Background Dipole as a Cosmological Effect

Details The Cosmic Microwave Background Dipole as a Cosmological Effect The Cosmic Microwave Background Dipole as a Cosmological Effect

1994-11-29

arxiv.org/abs/astro-ph/9411111v1

Astronomy and Astrophysics

Astrophysics

14 pages, plain TEX Submitted to ApJ The full postscript version with 3 figures at ftp://astro.princeton.edu/library/preprints

Scientific paper

A conventional explanation of the dipole anisotropy of the cosmic microwave background (CMB) radiation is in terms of the Doppler effect: our galaxy is moving with respect to CMB frame with $ \sim 600 ~ km ~ s^{-1} $. However, as the deep redshift surveys fail to reveal a convergence of the large scale flow to zero at distances as large as $ d \sim H^{-1} 15,000 ~ km ~ s^{-1} $ (Lauer & Postman, 1994), the uniqueness of the conventional interpretation has to be investigated. A possible alternative might be a cosmological entropy gradient, as suggested by Paczy\'nski & Piran (1990). We find that contrary to that suggestion a quadrupole anisotropy is generically of the same order of magnitude as the dipole anisotropy (or larger) not only for adiabatic but also for iso-curvature initial perturbations. Hence, the observed dipole cannot be explained with a very large scale perturbation which was initially iso-curvature.

Affiliated with

Also associated with

No associations

Rating

The Cosmic Microwave Background Dipole as a Cosmological Effect does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Cosmic Microwave Background Dipole as a Cosmological Effect, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Cosmic Microwave Background Dipole as a Cosmological Effect will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-69350