TL;DR
This paper investigates the emission of sub-eV hidden photons from the Sun, highlighting the significance of resonant regions and discussing implications for detection and cosmology.
Contribution
It provides new estimates of solar hidden photon emission, emphasizing the role of resonant regions, and discusses the potential of the TSHIPS I experiment to detect these particles.
Findings
Resonant regions below the photosphere significantly enhance hidden photon emission.
Hidden photons could explain the effective number of neutrinos in cosmological observations.
The TSHIPS I experiment is targeting meV-mass hidden photons with high sensitivity.
Abstract
We present some aspects and first results of the emission of sub-eV mass hidden photons from the Sun. The contribution from a resonant region below the photosphere can be quite significant, raising previous estimates. This is relevant for the Telescope for Hidden Photon Search, TSHIPS I, currently targeting at meV-mass hidden photons with O(10^-6) kinetic mixing with the photon. These particles could account for the large effective number of neutrinos pointed at by the cosmic microwave background and other large-scale structure probes, and are motivated in some scenarios of string theory.
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