I shall present joint work with Maxim Kontsevich
(arXiv:2105.10161) describing an interesting domain of complex
metrics on a smooth manifold. It is a complexification of the space
of ordinary Riemannian metrics, and has the Lorentzian metrics
(but...
What governs whether large-scale planetary habitability is
sustained through time? Lakes, valley networks, groundwaters,
hydrothermal systems, and chemically open-system weathering once
existed on Mars. The suite of aqueous environments preserved
in...
Abstract 1: In recent years, weak lensing of the cosmic
microwave background (CMB) has emerged as a powerful tool to probe
fundamental physics. The prime target of CMB lensing surveys is the
lensing potential, which is reconstructed from observed...
I will present the cosmological weak lensing results from the
Dark Energy Survey (DES) using its first three years of data, taken
on the 4m Blanco telescope at CTIO. This analysis spans the full
DES footprint, more than 4000 sq. deg. of sky, with...
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...
