The PVLAS collaboration has recently reported the observation of a rotation of the polarization plane of light propagating through a transverse static magnetic field. Such an effect can arise from the production of a light, mA ~ meV, pseudoscalar coupled to two photons with coupling strength gAγ ~ 5 × 10-6 GeV-1. Here, we review these experimental findings, discuss how astrophysical and helioscope bounds on this coupling can be evaded, and emphasize some experimental proposals to test the scenario.
Journal of Physics Conference Series
- Pub Date:
- May 2006
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment
- 4 pages, 1 figure, jpconf.cls, talk presented at the ninth International Conference on Topics in Astroparticle and Underground Physics, TAUP 2005, Zaragoza, Spain, September 10-14, 2005