Dipole Anisotropy from an Entropy Gradient

Details Dipole Anisotropy from an Entropy Gradient Dipole Anisotropy from an Entropy Gradient

1995-07-24

arxiv.org/abs/astro-ph/9507094v1

Phys.Rev. D53 (1996) 2908-2919

Astronomy and Astrophysics

Astrophysics

32 uuencoded including two figures, also available at ftp://shemesh.fiz.huji.ac.il or at http://shemesh.fiz.huji.ac.il/lan_pir

Scientific paper

10.1103/PhysRevD.53.2908

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 ultra-large scale ($\lambda > 100 c/H_0)$ 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.

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