Light hidden-sector U(1)s in string compactifications
Mark Goodsell, Andreas Ringwald

TL;DR
This paper reviews the existence and properties of light hidden-sector U(1) gauge bosons in string theory, estimating their kinetic mixing with visible sectors and exploring potential implications for particle physics and cosmology.
Contribution
It provides a comprehensive review of hidden U(1) gauge bosons in string compactifications, including estimates of kinetic mixing and phenomenological implications.
Findings
Hidden U(1)s can have very small masses and kinetic mixing with hypercharge.
Kinetic mixing can lead to observable effects in particle physics experiments.
Potential cosmological consequences include contributions to dark matter and dark radiation.
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.
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