Brust, C. (2013). New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar. Perimeter Institute for Theoretical Physics. https://pirsa.org/13110051
MLA
Brust, Christopher. New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar. Perimeter Institute for Theoretical Physics, Nov. 19, 2013, https://pirsa.org/13110051
BibTex
@misc{ scivideos_PIRSA:13110051,
doi = {10.48660/13110051},
url = {https://pirsa.org/13110051},
author = {Brust, Christopher},
keywords = {Particle Physics},
language = {en},
title = {New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar},
publisher = {Perimeter Institute for Theoretical Physics},
year = {2013},
month = {nov},
note = {PIRSA:13110051 see, \url{https://scivideos.org/pirsa/13110051}}
}
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.
