Abstract 1: The time delay measured between the images of
gravitationally lensed quasars probes a combination of angular
diameter distances and the mass profile of the lens. Observational
campaigns to measure such systems have reported a...
“Negative Energy, Quantum Information and
Causality”
Einstein’s equations of gravity show that too much negative
energy can lead to causality violations and causal paradoxes such
as the so-called "grandfather paradox.”...
The orbital evolution of binary systems perturbed by external
tidal forces represents one of the oldest problems in celestial
mechanics. Interest in this class of problems has resurged
recently due to the discovery of various exotic
astrophysical...
There is a Narain CFT naturally associated to any self-dual
quantum stabilizer code. For these "code CFTs", the
constraints of modular invariance reduce to simple algebraic
equations satisfied by the enumerator polynomial of the code, which
can be...
Astrometry from Gaia, deep variability surveys and large-area
Galactic spectroscopic surveys are enabling novel probes into white
dwarf astrophysics, and in particular are allowing us to tackle
anew the search for ultra-compact binaries containing...
Abstract 1: Reionization of the intergalactic medium remains one
of the most mysterious questions in the research of cosmology.
While the first generation of stars (Pop-III) likely ionize the
universe at 1-10% level at z>15, the second generation of...
We study the N = 4 SYM stress tensor multiplet 4-point function
for any value of the complexified coupling tau, and in principle
any gauge group (we focus on SU(2) and SU(3) for simplicity). By
combining non-perturbative constraints from the...
Near-Earth space has become increasingly valuable and its use
for civil (e.g., scientific), commercial, and military purposes has
grown enormously in recent years. This growth has been driven in
part by a rapid decrease in space-launch costs, which...
