Cosmic microwave background dipole from an entropy gradient

David Langlois, Tsvi Piran

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

It is generally accepted that the observed CMBR dipole arises from the motion of the local group relative to the CMBR frame. An alternative interpretation is that the dipole results from an ultralarge scale (λ>100c/H0) isocurvature perturbation. Recently it was argued that this alternative possibility is ruled out. We examine the growth of perturbations on scales larger than the Hubble radius, and in view of this analysis we show that the isocurvature interpretation is still a viable explanation. If the dipole is due to peculiar motion then it should appear in observations of other background sources provided that they are distant enough.

Original languageEnglish
Pages (from-to)2908-2919
Number of pages12
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume53
Issue number6
DOIs
StatePublished - 1996

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