Evading Astrophysical Constraints on Axion-Like Particles

Details Evading Astrophysical Constraints on Axion-Like Particles Evading Astrophysical Constraints on Axion-Like Particles

2005-04-22

arxiv.org/abs/hep-ph/0504202v3

JCAP0509:015,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

Final Version Accepted in JCAP

Scientific paper

10.1088/1475-7516/2005/09/015

Stellar energy loss arguments lead to strong constraints on the coupling $\phi \gamma \gamma$ of a light axion-like particle to two photons. Helioscopes, like CAST, are able to put competitive bounds. The PVLAS experiment has recently observed a rotation of the polarization of a laser propagating in a magnetic field that can be interpreted as the effect of a quite strong $\phi \gamma \gamma$ coupling. We present scenarios where the astrophysical and CAST bounds can be evaded, and we show that the PVLAS result can be accomodated in one of the models, provided the new physics scale is at very low energies.

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