Signatures of primordial helicity in the CMBR

L. Pogosian, T. Vachaspati, S. Winitzki

Research output: Contribution to journalArticlepeer-review


We have studied ways in which helical primordial magnetic fields could be constrained by measurements of the cosmic microwave background radiation (CMBR). If there were helical flows in the primordial plasma at the time of recombination, they would produce parity violating temperature-polarization correlations (ClTB and Cl)EB. However, the magnitude of helical flows induced by helical magnetic fields is unobservably small. We discuss an alternate scheme for extracting the helicity of a stochastically homogeneous and isotropic primordial magnetic field using Faraday rotation measure maps of the CMBR and the power spectrum of B-type polarization (Cl)BB.

Original languageEnglish (US)
Pages (from-to)132-134
Number of pages3
JournalNuclear Physics B - Proceedings Supplements
Issue numberSUPPL. 1
StatePublished - Apr 2003
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics


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