TL;DR
This paper investigates how photons interacting with hidden photons and millicharged particles can cause vacuum birefringence, deriving bounds on millicharged particles assuming hidden photons constitute local dark matter.
Contribution
It introduces a model analyzing photon interactions with hidden photons and millicharged particles, focusing on vacuum birefringence effects and setting bounds on millicharged parameters.
Findings
Derived bounds on millicharged particles from birefringence data
Identified conditions where hidden photons contribute to dark matter
Predicted measurable birefringence effects in vacuum
Abstract
We study a model where photons interact with hidden photons and millicharged particles through a kinetic mixing term. Particularly, we focus in vacuum birefringence effects and we find a bound for the millicharged parameter assuming that hidden photons are a piece of the local dark matter density
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