PIRSA:09050060 Conference Cosmology

DOI10.48660/09050060

Conference/School: Effective Field Theories in Inflation - 2009

Watson, S. (2009). NEC Violation and String Inspired Alternatives to Inflation. Perimeter Institute. https://pirsa.org/09050060

Watson, Scott. NEC Violation and String Inspired Alternatives to Inflation. Perimeter Institute, May. 22, 2009, https://pirsa.org/09050060 

@misc{ pirsa_PIRSA:09050060,
  doi = {10.48660/09050060},
  url = {https://pirsa.org/09050060},
  author = {Watson, Scott},
  keywords = {Cosmology},
  language = {en},
  title = {NEC Violation and String Inspired Alternatives to Inflation},
  publisher = {Perimeter Institute},
  year = {2009},
  month = {may},
  note = {PIRSA:09050060 see, \url{https://pirsa.org}}
}

Abstract

Inflationary cosmology provides a causal mechanism for the generation of super-Hubble cosmological fluctuations. There have been many alternative proposals suggested to accomplish this feat, however these all seem to share the need to violate at least the Null Energy Condition. I will attempt to make this statement more precise, and focusing on the case of string motivated models that contain a gravi-scalar in their spectrum (such as the string theoretic dilaton) we will find a "no-go" theorem. This provides an important challenge for models such as String Gas Cosmology and the Pre-Big Bang, if such models are to become more predictive.

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