I discuss work in progress on obtaining a reasonable density matrix of the universe in two dimensional quantum cosmology. I will do so by comparing aspects of the Hilbert space of closed universes in JT gravity…
The temperature and polarization anisotropies of the cosmic microwave background (CMB) have been used to set constraints on decaying dark matter models down to keV masses. In this talk, I will discuss recent work to…
The LIGO-Virgo-KAGRA Collaboration has detected nearly one hundred black-hole mergers in its first three observing runs and is finding several candidate mergers every week during its ongoing fourth run. These mergers…
