It has recently been understood from several points of view that
the Hilbert space of quantum gravity in a closed universe has
dimension one. It has also been argued that this problem can
be ameliorated by explicitly including the observer in the...
Supermassive black hole mergers are extraordinary cosmic
phenomena characterized by their immense energy release, producing
gravitational waves that can rival the total light output of all
stars in the universe within a short time frame. These...
I will review the Penrose and Wall singularity theorems and
describe their limitations. Following Shahbazi-Moghaddam, I will
argue that semiclassical gravity in the infinite species limit
becomes an exact theory whose metric is defined on all
scales...
Not much is known about what happens at the end of black hole
evaporation. Pushing the semi-classical evolution well beyond its
regime of validity suggests that the final Cauchy slice breaks into
a piece that remains behind the event horizon...
How and where do black hole mergers form in our Universe? After
10 years of GW science with LIGO/Virgo/Kagra, there still seems to
be no direct indication of what the underlying astrophysical
formation channels are. I will present ideas and ongoing...
Tidal disruption events — where an unfortunate star is destroyed
by a previously quiescent supermassive black hole — offer a unique
probe of the low mass end of the supermassive black hole
population. Recent observational advances have lead to the...
The interstellar medium (ISM) is a turbulent, multi-phase,
magnetic environment. It is home to vastly different gas phases,
from cold, dense clouds to hot, tenuous plasma. Magnetic fields
thread this interstellar environment, helping to sculpt...
In this talk, I will discuss Cosmohedra. These are geometric
objects which encode the vacuum wavefunction for theories with
colored scalars with cubic interactions. I will start by
introducing the vacuum wavefunction, both in Minkowski and de
Sitter...
At the center of nearly every galaxy in the Universe resides a
supermassive black hole. When galaxies collide, their supermassive
black holes sink to the center of the newly forming galaxy. There
in this nascent galactic nucleus a supermassive black...
