Argonne National Laboratory

Upcoming Events

New Light Species and the CMB

November 5, 2013 3:00PM to 4:00PM
Chris Brust, University of Maryland and JHU
Building 362, Room E188
HEP Theoretical Physics Seminar
The effective number of neutrino species in our universe, Neff, is capable of probing the presence of new light or massless species in our universe. I will first review relevant facts about both CMB measurements of new light species and thermodynamics in the early universe. Then, I will present the effects of many models of BSM physics containing new light species on the CMB, including models containing eV-scale sterile neutrinos compatible with anomalies in neutrino experiments, and interpret the compatibility of the parameter space of these models in terms of the recent results from the Planck satellite. I will argue that the bounds on couplings obtained from the Planck measurement of the CMB are competitive with bounds coming from other areas of physics.