Astrophysics Seminars

ABSTRACT: Can we use the Fermi satellite like WMAP? In 2006, S. Ando and I proposed to use anisotropies in the gamma-ray background (not CMB!) as a smoking-gun signature of annihilation of dark matter particles in the universe. The idea is simple...

ABSTRACT: New physics at the electro-weak scale might unlock the mysteries of the generation of the (baryonic) matter-antimatter asymmetry and of the particle nature of dark matter. I will review recent progress on understanding baryogenesis at the...

ABSTRACT: A massive black hole sits in the heart of the Milky Way. One consequence of the black hole is that it ejects "hypervelocity stars" from the Milky Way at ~1000 km/s velocities. We discovered the first hypervelocity star in 2005, and...

ABSTRACT: In the supersymmetric framework, a higgsino asymmetry exists in the universe before the electroweak phase transition. We investigate whether the higgsino is a viable asymmetric dark matter candidate. We find that this is indeed possible...

ABSTRACT: We have been constructing the cosmic energy inventory, which registers all forms of the energy existing in the universe. Examinations of the consistency across the entries tell us how well we understand the astrophysics of the universe...

ABSTRACT: I will present some early results from 'the Tractor', a new approach for measuring astronomical sources in collections of images that David Hogg (NYU) and I have been developing. The idea to use generative (forward) modeling: we want to...

ABSTRACT: I present the results of atmospheric general circulation modelling experiments for Earth-like planets in tidally locked configurations. The factors controlling the atmospheric circulation, which transports heat from the day side to the...