Gravity Group Astrophysics/Cosmology Lunch, "Vector Inflation and the Baryon Asymmetry Problem"(More about event)
Speaker: Stephon Alexander, Haverford/Princeton
I present work in collaboration with David Spergel and Antonino Marciano on a new model of inflation that also resolves the baryon asymmetry problem. Inflation begins with a large plasma density of interacting gauge fields and fermions, which interact through gravity and the Chern-Simons term. The Chern-Simons term drives power from an initial white-noise spectrum of gauge fields into a narrow-band of superhorizon wave vectors. At the same time, the fermionic current and metric coupling amplifies the gauge field on superhorizon scales. This phase-correlation and amplification of the gauge field produces the correct conditions to maintain more than 60 e-folds of inflation. The Sakharov conditions for baryogenesis are self-consistently satisfied, and we calculate the net baryon asymmetry index in terms of the gauge configuration necessary for inflation, based on the chiral anomaly. Eventually the gauge field dissipates by producing the observed baryon asymmetry n_b/s ~ 10^(-10), through the chiral anomaly and inflation ends. I end with a few speculation for how this model can be probed with upcoming CMB experiments such as PLANCK.
Location: Joseph Henry Room
Date/Time: 03/09/12 at 12:00 pm - 03/09/12 at 1:30 pm
Category: Gravity Group Seminar