Papers › Dark Photons from the Center of the Earth: Smoking-Gun Signals of Dark Matter
Dark Photons from the Center of the Earth: Smoking-Gun Signals of Dark Matter
Jonathan L. Feng, Jordan Smolinsky, Philip Tanedo
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Dark matter may be charged under dark electromagnetism with a dark photon that kinetically mixes with the Standard Model photon. In this framework, dark matter will collect at the center of the Earth and annihilate into dark photons, which may reach the surface of the Earth and decay into observable particles. We determine the resulting signal rates, including Sommerfeld enhancements, which play an important role in bringing the Earth's dark matter population to their maximal, equilibrium value. For dark matter masses m_X ∼ 100 GeV - 10 TeV, dark photon masses m_(A′) ∼ MeV - GeV, and kinetic mixing parameters ε∼10⁻¹⁰ - 10⁻⁸, the resulting electrons, muons, photons, and hadrons that point back to the center of the Earth are a smoking-gun signal of dark matter that may be detected by a variety of experiments, including neutrino telescopes, such as IceCube, and space-based cosmic ray detectors, such as Fermi-LAT and AMS. We determine the signal rates and characteristics, and show that large and striking signals---such as parallel muon tracks---are possible in regions of the (m_(A′), ε) plane that are not probed by direct detection, accelerator experiments, or astrophysical observations.
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