Video Lectures

We discuss several different definitions of phase spaces associated with horizons in general relativity, and the associated symmetry groups and charges.  For stationary horizons we compute the symplectic form of the theory in terms of independent...

Kerr or Reissner-Nordström black holes have inner horizons which delineate the domain of predictability of solutions of wave equation type. Often, though not e.g. for certain (A)deSitter black holes, these inner horizons are classically dynamically...

To construct interesting algebras in quantum gravity, one can dress local field operators to features of the spacetime. I will discuss this first in AdS JT gravity with matter, where matter operators may be dressed to the right or left AdS...

Information located in an entanglement island in semiclassical gravity can be
nonperturbatively reconstructed from distant radiation, implying a radical
breakdown of effective field theory. We show that this occurs well outside of
the black hole...

Post-inflationary QCD axion is an attractive solution to the Strong CP problem because of the possibility to uniquely predict the axion mass if axion makes up all of dark matter. On the other hand, QCD axion models often suffer from the so-called...

Accretion-powered X-ray pulsars are neutron stars that accrete matter from a companion star in a binary system, which exhibit fascinating dynamics. The strong magnetic field of the neutron star guides material onto the magnetic poles, which are...

We find ourselves at a pivotal era in the study of cosmology and galaxy formation. The dark energy + cold dark matter (ΛCDM) paradigm is firmly established as the default cosmological model, owing in large part to its incredible success in...

String stars, or Horowitz-Polchinski solutions, are string theory saddles with normalizable condensates of thermal-winding strings. In the past, string stars were offered as a possible description of stringy (Euclidean) black holes in asymptotically...

We used more than 25 million galaxies in the Subaru Hyper Suprime-Cam (HSC) shear catalog in the redshift range up to z~1.5 to measure weak lensing distortion effects due to large-scale structures. We used the measured weak lensing signals to...