I will review the status of cosmological searches for dark matter interactions, summarizing the best current limits on scattering of light particle candidates with protons derived from the cosmic-microwave-background anisotropy measurements. I will then present stringent new bounds on the same physics, inferred recently from the observed population of the Milky Way satellite galaxies. I will...
Constraining the particle properties of dark matter from astronomical observables requires detailed forward modeling that can connect those two regimes. I will discuss recent progress in implementing generic dark matter phenomenology (e.g. cut-offs in the power spectrum, self-interactions) into models of structure and galaxy formation - in particular in the context of fast and flexible...
Strong gravitational lensing is one of the most accurate methods to measure the mass of galaxies and haloes and one of the most promising to investigate the nature of dark matter. Given that the abundance of small-mass and dark clumps is very different in cold and warm dark matter model, this kind of observations can put important constraints on the nature of dark matter, through the detection...
The particle nature of dark matter determines the abundance and density profiles of dark matter halos. On sub-galactic mass scales differences between various dark matter models become especially pronounced. Strong gravitational lensing by galaxies offers a direct probe of dark matter structure in this low-mass regime where halos contain little to no stars, and are therefore invisible. I will...
Gravitational lensing by galactic potentials is a powerful tool with which to probe the abundance of low-mass dark matter structures in the universe. Dark matter substructures or line-of-sight haloes introduce small scale perturbations to the smooth lensing potential. By observing detections (or non-detections) of such low-mass perturbers in lensed systems, we can place constraints on the halo...
Fermi-LAT has revolutionized our understanding of the gamma-ray sky from hundreds of MeV up to almost TeV energies. One of the main scientific goals of the LAT Team is to search for a dark matter production of gamma rays. This search is performed by analyzing the data in the direction of the most promising dark matter targets: the Galactic center, Milky Way Dwarf Spheroidal Galaxies, the...
An excess $\gamma$-ray signal toward the outer halo of M31 has recently been reported. Although other explanations are plausible, the possibility that it arises from dark matter (DM) is valid. In this talk I will first briefly review the Fermi-LAT observations toward the outer halo of M31. I will then present results for a DM interpretation of the observed excess. We use as our representative...
The Fermi-LAT collaboration has recently released a new point source catalog, referred to as 4FGL. For the first time, we perform a template fit using information from this new catalog and find that the Galactic center excess is still present. On the other hand, we find that a wavelet-based search for point sources is highly sensitive to the use of the 4FGL catalog: no excess of bright regions...
