Rotation of Linear Polarization Plane and Circular Polarization from Cosmological Pseudoscalar Fields

Details Rotation of Linear Polarization Plane and Circular Polarization from Cosmological Pseudoscalar Fields Rotation of Linear Polarization Plane and Circular Polarization from Cosmological Pseudoscalar Fields

2008-02-28

arxiv.org/abs/0802.4210v3

Phys.Rev.D79:063002,2009

Astronomy and Astrophysics

Astrophysics

Final version appeared in Physical Review D

Scientific paper

10.1103/PhysRevD.79.063002

We discuss the rotation of the linear polarization plane and the production of circular polarization generated by a pseudoscalar field acting as dark matter. We compute analytically and numerically the propagation of the Stokes parameters from the last scattering surface for an oscillating and a monotonic decreasing pseudoscalar field. For the models studied in this paper, we show the comparison between the widely used approximation in which the rotation angle is constant in time and the exact result.

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