Illuminating the Hidden Sector of String Theory by Shining Light through a Magnetic Field

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  • 22 August 2006
Abstract
It has recently been shown that the observation by the PVLAS collaboration of an anomalously large rotation of the polarization plane of light in the presence of a magnetic field in vacuum may originate from pair production of light, m_f ~ 0.1 eV, millicharged, Q_f ~ 3*10^{-6} e, fermions. Such millicharges arise generically from kinetic-mixing in theories containing at least two U(1) gauge factors. In this letter, we point out that the required multiple U(1) factors, the size of kinetic-mixing, and suitable matter representations to explain the PVLAS data occur very naturally in the context of realistic extensions of the Standard Model (SM) of elementary particle physics based on string theory.

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