Monday, June 10, 2013
High Energy Physics Seminar
Dark Photon: Stellar Constraints and Direct Detection
Haipeng An, Perimeter Institute
Based on my recent work with Maxim Pospelov and Josef Pradler, http://arxiv.org/abs/1302.3884, I will talk about the stellar production of vector states V within the minimal model of "dark photons". I will show that when the Stuckelberg mass of the dark vector becomes smaller than plasma frequency, the emission rate is dominated by the production of the longitudinal modes of V, and scales as \kappa^2 m_V^2, where \kappa and m_V are the mixing angle with the photon and the mass of the dark state. This is in contrast with earlier erroneous claims in the literature that the emission rate decouples as the forth power of the mass. We find that stellar bounds for m_V < 10 eV are significantly strengthened, to the extent that all current "light-shining-through-wall" experiments find themselves within deeply excluded regions. I will also talk about better ways to detect the eV and sub-eV scale "dark photon".