PIRSA:09090011 Scientific Series Cosmology

DOI10.48660/09090011

Series: Cosmology and Gravitation

Magueijo, J. (2009). Generating scale-invariant fluctuations without inflation. Perimeter Institute. https://pirsa.org/09090011

Magueijo, Joao. Generating scale-invariant fluctuations without inflation. Perimeter Institute, Sep. 24, 2009, https://pirsa.org/09090011 

@misc{ pirsa_PIRSA:09090011,
  doi = {10.48660/09090011},
  url = {https://pirsa.org/09090011},
  author = {Magueijo, Joao},
  keywords = {Cosmology},
  language = {en},
  title = {Generating scale-invariant fluctuations without inflation},
  publisher = {Perimeter Institute},
  year = {2009},
  month = {sep},
  note = {PIRSA:09090011 see, \url{https://pirsa.org}}
}

Abstract

I describe a number of techniques that allow for the generation of (near) scale-invariant fluctuations in the early Universe without inflation or ekpyrosis. The basic ingredient is a decaying maximal speed of propagation, for which a Universal law is found. Connections are made with k-essence, the cuscaton, and the DBI action. However the simplest realizations result from bimetric theories and deformed dispersion relations and DSR. A number of implications to theories of quantum gravity are discussed.

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