Video Lectures

Neutron star merger GW 170817 was accompanied by a gamma-ray burst with luminosity L∼1047 erg/s, coming with a ~2 s delay after the gravitational waves. Observations also indicate the presence of a dark, ultra-relativistic envelope ejected promptly...

Spektr-RG spacecraft with Russian (ART-XC) and German (eRosita) X-Ray telescopes was launched on July 13th of 2019 from Baykonur. During the flight to the L2 point of the Sun-Earth system, SRG performed calibrations and detailed long duration...

I will motivate and discuss the notion of dispersive sum rules in conformal field theory. They are sum rules satisfied by the OPE data of a four-point function as a consequence of conformal dispersion relations. Physically, they are a detailed...

We have undertaken a novel census of red sources identified by their rest-frame far infrared colors using Planck and Herschel telescopes, and not by the Sunyaev-Z'eldovich effect (SZE). The vast majority of sources are high-redshift galaxy...

I will discuss insights from analytic and numerical models of galactic chemical evolution and observations of Milky Way elemental abundances from the SDSS APOGEE survey. Under generic model assumptions, abundances and abundance ratios approach an...

Abstract: I will demonstrate that holographic error correcting codes naturally give rise to conditional expectations acting on the local operator algebras in the boundary theory. I will use this to give simple derivations of some previously known...

I will discuss recent work that lays out two methods to obtain direct measurements of the Galactic acceleration. First, I will review our recent work in using high precision spectrographs to measure the Galactic acceleration. These measurements can...

In the solar system as elsewhere, we learn most from the unexpected. I will describe three recent observational projects challenging existing ideas about solar system objects, and provoking new ones. The freaks are an interstellar object (‘Oumuamua)...

In conformal field theory, in contrast to gapped theories, S-matrix is not well-defined. Similarly, various inclusive observables which make sense in a gapped theory, such as "energy squared" calorimeters, suffer from IR divergences in CFTs. Using...

Turbulence is ubiquitous in astrophysical media and plays an essential role in a variety of fundamental astrophysical processes. The turbulent power-law spectra have been observed in the solar wind, the interstellar medium, the intracluster medium...