Recent works by Chandrasekaran, Penington and Witten have shown
in various special contexts that the quantum-corrected
Ryu-Takayanagi (RT) formula can be understood as computing an
entropy on an algebra of bulk observables. These arguments do
not...
Spacetime inversion symmetries such as parity and time reversal
play a central role in physics, but they are usually treated as
global symmetries. In quantum gravity there are no global
symmetries, so any spacetime inversion symmetries must be
gauge...
Working intrinsically on a null hypersurface, we first show that
the Raychaudhuri constraint is the conservation law of a Carrollian
stress tensor. After suitably dressing the diffeomorphisms with the
internal boost symmetry, we derive the full...
Out of time ordered correlator(OTOC) is one signature of quantum
chaos. In certain large N systems, emergent scramblon-exchange
modes dominate, while scramblon interactions are suppressed by
1/N. However, we are going to discuss certain types of...
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...
