PIRSA:14030112 Scientific Series Cosmology

DOI10.48660/14030112

Series: Cosmology and Gravitation

Grin, D. (2014). Cosmic initial conditions and the CMB. Perimeter Institute. https://pirsa.org/14030112

Grin, Daniel. Cosmic initial conditions and the CMB. Perimeter Institute, Mar. 25, 2014, https://pirsa.org/14030112 

@misc{ pirsa_PIRSA:14030112,
  doi = {10.48660/14030112},
  url = {https://pirsa.org/14030112},
  author = {Grin, Daniel},
  keywords = {Cosmology},
  language = {en},
  title = {Cosmic initial conditions and the CMB},
  publisher = {Perimeter Institute},
  year = {2014},
  month = {mar},
  note = {PIRSA:14030112 see, \url{https://pirsa.org}}
}

Abstract

One new frontier in cosmology is the frequency spectrum of the CMB. Future instruments may be precise enough to measure deviations from the nearly-perfect blackbody, measuring a chemical potential and thus probing energy injection at extremely high redshift. I will discuss ($\mu$ and $y$-type) CMB spectral distortions from the dissipation of entropy (isocurvature)-sourced acoustic modes. I will then discuss how a high-energy phase transition could also source such distortions. I will then switch gears and talk about the possibility of measuring a spatial fluctuation in the baryon/DM ratio using the CMB, including recent observational results. I may also muse on the surprising possible connection between these compensated isocurvature modes and the anomalously low large-scale scalar power hinted at by Planck observations of the CMB temperature power spectrum and the recent claimed BICEP2 detection of primordial tensor modes

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