Physics Colloquium: The Chiral Universe

Department of Physics is pleased to welcome Dr. Stephon Alexander for an in-person colloquia presentation.

Dr. Alexander is a Professor of Physics at Brown University. Stephon Alexander is a Professor of Physics at Brown University and former President of the National Society of Black Physicists (NSBP). Alexander has had previous appointments at Stanford University, Imperial College, Penn State, Dartmouth College, and Haverford College. He is a specialist in the field of string cosmology, where the physics of superstrings are applied to address longstanding questions in cosmology. In 2001, he co-invented the model of inflation based on higher dimensional hypersurfaces in string theory called D-Branes. In such models, the early universe emerged from the destruction of a higher dimensional D-brane which ignites a period of rapid expansion of space often referred to as cosmic inflation.

Abstract

Among a handful of mysteries in the LambdaCDM paradigm of cosmology, I focus on three: Dark Matter, Baryogenesis and the origin of structure. I then provide a pedagogical introduction to Chiral Gravity and show how these three mysteries may be interconnected. I also discuss some observational windows including the inevitability of Superfluid Dark matter.