Requirement of a Primordial Magnetic Field in Chameleon Models

Details Requirement of a Primordial Magnetic Field in Chameleon Models Requirement of a Primordial Magnetic Field in Chameleon Models

2011-08-03

arxiv.org/abs/1108.0892v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 3 figures

Scientific paper

We show that the presence of primordial magnetic fields (PMFs) are imperative in order to satisfy constraints placed on chameleon models from variation of particle masses at big bang nucleosynthesis. For initial field values after inflation of order the Planck mass, the combined magnetic field strength, B, and chameleon-photon coupling, 1/M_F, must satisfy (B/5nG)^2(M_F/10^{9}GeV)^{-1} > 2.4x10^{-6}. Combining these constraints with those derived from considering the degree of mixing between chameleons and CMB photons in a PMF, implies the existence of a primordial magnetic field with strength B > 0.1nG, for theories of Modified Gravity with a chameleon mechanism to be viable.

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