Cosmological observables, from the Lyman-alpha forest to Milky Way substructure, offer unique avenues for testing new physics. I will review the status of the recent early-universe and late-universe searches for the identity of dark matter and for new physics in the neutrino sector, summarizing the best current limits on scattering between dark matter and baryons and neutrino self-scattering....
I will present COZMIC, a suite of over 100 cosmological zoom-in simulations with initial conditions beyond CDM. COZMIC spans initial conditions for warm, fuzzy, and interacting dark matter models. The shape of the linear matter power spectrum, P(k), is imprinted on the corresponding subhalo populations. Modeling this effect improves fuzzy and interacting dark matter bounds from the Milky Way...
Indirect dark matter detection in the MeV energy range is notably constrained by our limited observing sensitivity in this regime. The Compton Spectrometer and Imager (COSI), selected as a NASA Small Explorer satellite with an expected launch in 2027, will offer new potential to push these boundaries. COSI is a gamma-ray telescope that will survey the sky from 0.2-5 MeV with excellent energy...
At dwarf galaxy scales and smaller, the thermal and kinetic properties of dark matter influence the growth of cosmological and galactic structures. These effects are observable through various methods, including dwarf galaxy counts, the Lyman-alpha forest, and strong lensing. I will review the current constraints and evidence for a small-scale cutoff in structure formation, consistent with...
