New limit on pseudoscalar-photon mixing from WMAP observations

Prabhakar Tiwari*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Pseudoscalar-photon mixing in the presence of a large scale magnetic field induces polarization in light from distant cosmological sources. We study the effect of these pseudoscalars or axionlike particles on cosmic microwave background radiation and constrain the product of mixing strength g times background magnetic field B. The background magnetic field has been assumed to be primordial, and we assume large scale correlations with the correlation length of 1 Mpc. We use WMAP seven-year foreground reduced polarization and temperature data to constrain the pseudoscalar-photon mixing parameter. We look for different mass limits of the pseudoscalars and find gB≤1.6×10 -13 GeV-1 nG with axionlike particles of mass 10 -10 eV and gB≤3.4×10-15 GeV-1 nG for ultralight axionlike particles of mass 10-15 eV.

Original languageEnglish
Article number115025
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number11
StatePublished - 28 Dec 2012
Externally publishedYes


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