TL;DR
This paper explores how the presence of dark matter within supernovae, acting as a 'smog', can significantly alter the cooling constraints related to hidden gauge bosons, impacting dark matter theories.
Contribution
It introduces the concept of dark matter 'smog' inside supernovae, showing how it can relax existing constraints on hidden gauge boson models.
Findings
Dark matter inside supernovae can shorten the hidden boson free streaming length.
Dark matter 'smog' substantially relaxes supernova cooling constraints.
Implications for dark matter models with hidden gauge bosons.
Abstract
A light hidden gauge boson with kinetic mixing with the usual photon is a popular setup in theories of dark matter. The supernova cooling via radiating the hidden boson is known to put an important constraint on the mixing. I consider the possible role dark matter, which under reasonable assumptions naturally exists inside supernova, can play in the cooling picture. Because the interaction between the hidden gauge boson and DM is likely unsuppressed, even a small number of dark matter compared to protons inside the supernova could dramatically shorten the free streaming length of the hidden boson. A picture of a dark matter "smog" inside the supernova, which substantially relaxes the cooling constraint, is discussed in detail.
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