Astrophysics Seminars

I will present a novel screening mechanism that allows a scalar field to mediate a long range ~Mpc force of gravitational strength in the cosmos while satisfying local tests of gravity. The mechanism hinges on local symmetry restoration in the...

ABSTRACT: Pulsars are electromagnetic machines that convert the rotational energy of neutron stars into relativistic magnetically-dominated outflows. How these machines actually operate has remained a puzzle for many years. I will describe the...

Using hydro-cosmological simulations and analytic modeling, we attempt solid predictions for the formation of massive galaxies at high redshift within the LCDM cosmology. The emerging new picture highlights the formation of galaxies at the nodes of...

In the last few decades, advances in observational cosmology have given us a standard model of cosmology. We know the content of the universe to within a few percent. With more ambitious experiments on the way, we hope to move beyond the knowledge...