Astrophysics Seminars

In this talk I will discuss the non-linear infrared effects that plagues Standard Perturbation Theory for Large Scale Structure. Understanding and resumming these contributions is essential to achieve a detailed description of the correlation...

Accurate cluster masses are a key component in deriving cosmological constraints from galaxy cluster abundance. Weak lensing (WL) provides a direct measure of the cluster mass, both baryonic and dark, regardless of the underlying nature of the mass...

Coalescing binary neutron stars are among the most promising sources for ground-based gravitational wave detectors such as advanced LIGO. Tidal interactions in such systems extract energy from the orbit and, at some level, modify the gravitational...

The ongoing search for intergalactic magnetic fields using blazar observations suggests field strength in the 10^(-14) to 10^{-17} G range on tens of Mpc length scales. Such fields can have important implications for the early universe and also...

Fluctuations in a stellar system's gravitational field cause the orbits of stars to evolve. These fluctuations can either originate from external perturbers (e.g. flybys), or from the intrinsic discreteness of the system (e.g. giant molecular clouds...

It is becoming an observational reality to catch common envelope episodes and stellar mergers in action as astronomical transients. We think that most compact binaries pass through these phases, where one star becomes engulfed by the envelope of its...

Galaxy mergers have long been implicated as drivers of supermassive black hole (BH) and galaxy co-evolution, but the relative importance of mergers for fueling active galactic nuclei (AGN) is still uncertain. In large part, the ongoing debate stems...

Although quasar activity is believed to be associated with galaxy mergers, at least one of the progenitor galaxies must host a pre-existing massive black hole (MBH). Furthermore, mergers make spheroids, yet there are galaxies lacking classical...

TITLE & ABSTRACT ADDED - Kuiper Belt Objects are often touted as fossil records of the early Solar System. So what can we learn from them? Here I will discuss one important aspect, their primordial size distribution: is it top-heavy with most of the...