Late time CMB anisotropies constrain mini-charged particles

Details Late time CMB anisotropies constrain mini-charged particles Late time CMB anisotropies constrain mini-charged particles

2009-09-03

arxiv.org/abs/0909.0649v1

JCAP11(2009)002

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

17 pages, 3 figures

Scientific paper

10.1088/1475-7516/2009/11/002

Observations of the temperature anisotropies induced as light from the CMB passes through large scale structures in the late universe are a sensitive probe of the interactions of photons in such environments. In extensions of the Standard Model which give rise to mini-charged particles, photons propagating through transverse magnetic fields can be lost to pair production of such particles. Such a decrement in the photon flux would occur as photons from the CMB traverse the magnetic fields of galaxy clusters. Therefore late time CMB anisotropies can be used to constrain the properties of mini-charged particles. We outline how this test is constructed, and present new constraints on mini-charged particles from observations of the Sunyaev-Zel'dovich effect in the Coma cluster.

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