Astrophysics

Abstract 1: The CDM scenario predicts an entire hierarchy of dark substructure within the Milky Way halo that is, barring any annihilation signal, only detectable gravitationally. Cold tidal streams from disrupting globular clusters have been...

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...

The smallest and faintest galaxies around the Milky Way are the most ancient, most metal-poor, and most dark-matter-dominated systems known. These extreme objects offer unique access to small scales where the stellar and dark matter content can be...

Gravitational waves (GW) from compact binary coalescences are natural cosmological probes. On the one hand, these standard siren sources provide direct measurements of luminosity distance. In addition, features in the mass distribution, such as mass...

Please note if you would like to attend the Bahcall lunch, please select your lunch option with this Google form by the Friday before at 3pm. 

Modern astronomical spectrometers are approaching the exquisite sensitivity to detect the signature of an Earth-mass planet around stars like the Sun. I shall discuss the challenges involved in making these difficult measurements with the Doppler...

Magnetic fields of strength ~μG are observed in galaxies today, but their origin is unknown. A promising scenario is that magnetic fields larger than 0.1 nG at Mpc scales generated during inflation were adiabatically compressed during structure...

Princeton University’s policy on attending events in person can be found here: https://ehs.princeton.edu/VisitorPolicy

Abstract: I will introduce the gravitational path integral and discuss some of its modern applications. Our first application...