Browsing by Author "Arellano, Natalia Tapia"

Now showing 1 - 3 of 3
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    Gamma ray signals from cosmic ray scattering on axionlike particles
    Dent, James B.; Dutta, Bhaskar; Newstead, Jayden L.; Rodriguez, Alejandro; Shoemaker, Ian M.; Tabrizi, Zahra; Arellano, Natalia Tapia (2021-09-28)
    Dark matter (DM) may be comprised of axionlike particles (ALPs) with couplings to photons and the standard model fermions. In this paper, we study photon signals arising from cosmic ray (CR) electron scattering on background ALPs. For a range of masses we find that these bounds can place competitive new constraints on the ALP-electron coupling, although in many models lifetime constraints may supersede these bounds. In addition to current Fermi constraints, we also consider future e-Astrogram bounds which will have greater sensitivity to ALP-CR induced gamma-rays.
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    Milli-magnetic monopole dark matter and the survival of galactic magnetic fields
    Graesser, Michael L.; Shoemaker, Ian M.; Arellano, Natalia Tapia (Springer, 2022-03-16)
    Dark sectors with Abelian gauge symmetries can interact with ordinary matter via kinetic mixing. In such scenarios, magnetic monopoles of a broken dark U(1) will appear in our sector as confined milli-magnetically charged objects under ordinary electromagnetism. Halo ellipticity constraints are shown to significantly bound the strength of dark magnetic Coulomb monopole interactions. The bound magnetic monopole ground state, which in vacuum is stable and has no magnetic charge or moment, is shown to become quantum mechanically unstable in the presence of an external, ordinary magnetic field. If these states contribute sizably to the local dark matter density, they extract significant energy from the galactic magnetic field. We revise and extend this "Parker Bound" on galactic magnetic energy loss to milli-magnetic monopoles which leads to the strongest existing constraints on these states, satisfying our halo ellipticity bounds, over a wide range of magnetic monopole masses.
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    Present and future status of light dark matter models from cosmic-ray electron upscattering
    Dent, James B.; Dutta, Bhaskar; Newstead, Jayden L.; Shoemaker, Ian M.; Arellano, Natalia Tapia (2021-05-18)
    Nonrelativistic dark matter (DM) can be accelerated by scattering on high-energy cosmic-ray (CR) electrons. This process leads to a subpopulation of relativistic or semirelativistic DM which extends the experimental reach for direct detection in the sub-GeV mass regime. In this paper we examine the current and future potential of this mechanism for constraining models of light dark matter. In particular, we find that Super-Kamiokande and XENON1T data can already provide leading constraints on the flux of dark matter that has been accelerated to high energies from cosmic ray electrons. We also examine future projected sensitivities for DUNE and Hyper-K, and contrary to previous findings, conclude that DUNE will be able supersede Super-K bounds on cosmic-ray upscattered DM for a variety of DM models.