Astrophysics Seminars

Cosmological observables, from the Lyman-alpha forest to the Milky Way substructure, offer unique avenues for probing dark matter and neutrino sectors. Moreover, they often reveal anomalies and tensions that could signal new physics. I will review...

Massive black holes (MBHs) are found in galaxies across a wide mass range and play a central role in regulating gas cooling and star formation through active galactic nucleus (AGN) feedback. Cosmological simulations—where MBHs and galaxies co-evolve...

Gas-rich environments are ubiquitous in various scales, from protoplanetary disks to star clusters and galaxies. Dynamics in gas-rich environments are substantially different and give rise to unique astrophysical phenomena, along with enhancing the...

Nonlinear magnetic structures can be generated in the vicinity of collisionless shocks by streaming of accelerated particles and as part of the shock structure evolution. I will discuss the effects of these nonlinearities on particle pre-heating and...

Super-Earths and sub-Neptunes are the most abundant exoplanets discovered in our galaxy to date. However, much of their nature and origin remains shrouded in mystery. Generally speaking, super-Earths and sub-Neptunes are thought to have formed with...

Spatially resolved polarimetric images of black holes with the Event Horizon Telescope (EHT) favor models with strong magnetic fields, so-called Magnetically Arrested Disks or MAD models.  MADs can produce efficient jets via the Blandford-Znajek (BZ...

The alpha disk model is widely used to describe the accretion disk structures around supermassive black holes, even though it cannot explain many observed properties of AGNs. Various alternative models have been proposed including the ones where...

Deep generative models offer powerful tools for solving astrophysical inference problems by enabling flexible representations of prior knowledge and likelihood functions. 

In the first part of the talk, I will discuss how generative models can be...

Since its launch just two and a half years ago, JWST has made multiple remarkable discoveries. I will discuss the search for ever more distant galaxies and accreting black holes, and the implications of these observations for our theories of...

The so-called galaxy--halo connection is a vast topic concerning how galaxies populate their host dark matter halos.  I will present some works we have made under this grand theme, including (1) the detection of assembly bias signal with the help of...