Light hidden-sector U(1)s in string compactifications

Abstract

We review the case for light U(1) gauge bosons in the hidden-sector of heterotic and type II string compactifications, present estimates of the size of their kinetic mixing with the visible-sector hypercharge U(1), and discuss their possibly very interesting phenomenological consequences in particle physics and cosmology.

4 pages, to appear in the proceedings of the 9th Hellenic School on Elementary Particle Physics and Gravity, Corfu 2009, Greece

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