PIRSA:13110051 Scientific Series Particle Physics

DOI10.48660/13110051

Series: Particle Physics

Brust, C. (2013). New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar. Perimeter Institute. https://pirsa.org/13110051

Brust, Christopher. New Light Species and the CMB - Joint Cosmology/Particle Physics Seminar. Perimeter Institute, Nov. 19, 2013, https://pirsa.org/13110051 

@misc{ pirsa_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},
  year = {2013},
  month = {nov},
  note = {PIRSA:13110051 see, \url{https://pirsa.org}}
}

Abstract

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.

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