Phenomenological implications on a hidden sector from the Festina Lente bound

Abstract

We apply the Festina Lente (FL) bound on a hidden sector with $U(1)$ gauge symmetries. Since the FL bound puts a lower bound on masses of particles charged under the $U(1)$ gauge symmetries, it is possible to constrain the hidden sector even with a tiny coupling to the Standard Model. In particular, we focus on the phenomenological implications of the FL bound on milli-charged particles, which naturally arise when kinetic mixing between the photon and the hidden photon is allowed. It turns out that the milli-charged particle with the mass $M\lesssim 5$ meV is prohibited by the FL bound in the case of a single hidden $U(1)$, independent of the value of kinetic mixing. This bound is crucial when bosonic dark matter is taken in consideration in this framework: the fuzzy bosonic dark matter models requesting minuscule masses are ruled out by the FL bound if the longevity of dark matter is protected by the hidden gauge symmetry.

References in corpus (7)

• The Swampland: Introduction and Review
• A lower bound on the mass of Dark Matter particles
• Sterile Neutrinos
• Dark matter and a new gauge boson through kinetic mixing
• Galactic 511 keV line from MeV millicharged dark matter
• Higgs Inflation and the Refined dS Conjecture
• Exploring millicharged dark matter components from the shadows

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