|
Résumé |
Telescope observations of nearby astrophysical structures provide important
insights about the nature of dark matter. In this talk, I’ll first discuss recent
work on the well-established observational strategy for probing the properties of
cold particle dark matter by searching for gamma-ray signals from its annihilation
or decay. The Model-Agnostic Dark Halo Analysis Tool (MADHAT) is a publicly-
available computational tool that uses data from the Fermi-LAT to constrain gamma
ray emission from dwarf satellite galaxies due to dark matter annihilation, dark
matter decay, or other nonstandard or unknown astrophysics. I’ll discuss the
capabilities of MADHAT, and the constraints it can provide for any model of dark
matter particle physics or astrophysics. I’ll also discuss a new Tool for
Determining background Emission Empirically (TweedleDEE), which facilitates purely
data-driven searches for anomalous localized sources of gamma-ray emission,
including new physics, as well as some possible future directions. Finally, I
consider the addition of cosmologically-stable light particles that reached
thermal equilibrium in the early universe and today constitute a subdominant
component of hot dark matter. I’ll present new results on how these hot relics
cluster into structures alongside a dominant cold dark matter component. As an
example, this formalism is used to establish constraints on eV-scale thermal
axions from optical and infrared telescope data. |
