Constraints on background torsion from birefringence of CMB polarization

Details Constraints on background torsion from birefringence of CMB polarization Constraints on background torsion from birefringence of CMB polarization

2009-08-05

arxiv.org/abs/0908.0629v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10 pages, RevTeX 4

Scientific paper

We show that a non-minimal coupling of electromagnetism with background
torsion can produce birefringence of the electromagnetic waves. This
birefringence gives rise to a B-mode polarization of the CMB. From the bounds
on B-mode from WMAP and BOOMERanG data, one can put limits on the background
torsion at $\xi_{1}T_{1}=(-3.35 \pm 2.65) \times 10^{-22} GeV^{-1}$.

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