Astrophysics

Each week, we hold a relatively informal seminar/discussion series with an emphasis on extra-galactic and large-scale structure astrophysics.

During Galread a leader/visitor presents a recent paper to the discussion group. The PDF of the paper is...

A Parameter Survey of Neutron Star Accretion Column Simulations
Abstract: Accretion-powered X-ray pulsars are neutron stars that accrete matter from a companion star in a binary system. The strong magnetic field of the neutron star channels material...

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...

I will describe recent results from the Dark Energy Spectroscopic Instrument (DESI) on the measurement of the cosmic distance scale with the baryon acoustic oscillation (BAO) method and its resulting implications for cosmology and dark energy.  I'll...

The Bahcall Lunch follow the astrophysics colloquium lecture. Registration is required by noon the previous Thursday so a meal can be provided.

The detection of GW170817 enabled us to track down and watch the cataclysm event in multiple wavelengths of light, allowing us to scrutinize the source of these cosmic ripples for the first time. This discovery provided the first solid evidence that...

Modern cosmological surveys are amassing data in petabytes, ranging from the cosmic microwave background to optical galaxy surveys. Traditionally, these vast data sets are compressed into $O(100-1000)$ correlation statistics to constrain key...

Abstract: We construct the classical phase space of Jackiw-Teitelboim (JT) gravity with positive cosmological constant on spatial slices with circle topology. We identify solutions not previously discussed in the literature, and find the phase space...