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The Polarization Signature of Local Bulk Flows

Authors
  • Roebber, Elinore
  • Holder, Gilbert
Type
Published Article
Publication Date
Dec 04, 2013
Submission Date
Jun 21, 2013
Identifiers
DOI: 10.1088/0004-637X/781/2/98
Source
arXiv
License
Yellow
External links

Abstract

A large peculiar velocity of the intergalactic medium produces a Doppler shift of the cosmic microwave background with a frequency-dependent quadrupole term. This quadrupole will act as a source for polarization of the cosmic microwave background, creating a large-scale polarization anisotropy if the bulk flow is local and coherent on large scales. In the case where we are near the center of the moving region, the polarization signal is a pure quadrupole. We show that the signal is small, but detectable with future experiments for bulk flows as large as some recent reports.

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