Astrophysics Seminars

Among many things, dark matter could be made of new fundamental or composite particles, which may feebly interact with nuclei or electrons (“baryons”), as well as with themselves. Cosmological observables are a promising avenue to test such...

Binary stars in the central parsecs of galaxies are involved in the production of several modern astronomical phenomena, including hypervelocity stars, repeating partial tidal disruption events, and dust-enshrouded objects around Sgr A*. I present...

Astrophysical black holes are surrounded by accretion disks, jets, magnetospheres, and coronae consisting of magnetized relativistic plasma. They produce observable multi wavelength and multi messenger signals from near the event horizon and it is...

I will motivate current work in weak gravitational lensing with cosmic and astrophysical puzzles. The evolution of dark energy, the growth of structure and feedback from supermassive black holes are some of the debated questions. I will describe how...

Tidal disruption events — where an unfortunate star is destroyed by a previously quiescent supermassive black hole — offer a unique probe of the low mass end of the supermassive black hole population. Recent observational advances have lead to the...

This study evaluates the performance and applicability of the high-order Spectral-Difference (SD) method in astrophysical contexts. We begin by analyzing the advantages and disadvantages of SD relative to the widely used Finite-Volume (FV) methods...

After ten years of gravitational-wave observations with the LIGO–Virgo–KAGRA interferometers, over 200 signals from merging black hole binaries have been detected, bringing us closer to understanding how these systems form. Addressing this question...

Cold Neptunes appear to be among the most abundant planets in the Galaxy, yet their role in shaping planetary systems remains poorly understood. We study the dynamical evolution of cold Neptune systems born in resonant chains through disk-driven...

Discs of stars around super-massive black holes, like the one at the Galactic centre, evolve primarily via resonant relaxation, which is the process governing the evolution of the angular-momentum vectors of stellar orbits about the super-massive...

The evolution of planets and planetary systems depends on the environments created by their host stars in a number of ways.  In this talk, I will discuss several observable impacts of stellar winds, radiation pressure, and non-thermal ionizing...