Bradly Boucher
24, Naval Aviator, Radar Engineer, Published Astrophysicist, Mathematician.
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My Research on Dark Matter
My Research on Dark Matter
If dark matter annihilates with a velocity-dependent cross section within a subhalo, then the magnitude and angular distribution of the resulting photon signal will change. These effects are encoded in the $J$-factor. In this work we compute the $J$-factor for a variety of choices for the cross section velocity dependence, and for a variety of choices for the dark matter profile, including generalized Navarro-Frenk-White, Einasto, Burkert and Moore. Interestingly, we find that for a density profile with an inner slope power law steeper than $4/3$, Sommerfeld-enhanced annihilation in the Coulomb limit leads to a divergence at the center, requiring a more detailed treatment of departure from the Coulomb limit.
My Research on Cepheid Variable Stars
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My Research on Cepheid Variable Stars
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