PIRSA:08090005 Scientific Series Cosmology

DOI10.48660/08090005

Series: Cosmology and Gravitation

(2008). Vacuum Energy and Fine Tuning. Perimeter Institute. https://pirsa.org/08090005

Vacuum Energy and Fine Tuning. Perimeter Institute, Sep. 30, 2008, https://pirsa.org/08090005 

@misc{ pirsa_PIRSA:08090005,
  doi = {10.48660/08090005},
  url = {https://pirsa.org/08090005},
  author = {},
  keywords = {Cosmology},
  language = {en},
  title = {Vacuum Energy and Fine Tuning},
  publisher = {Perimeter Institute},
  year = {2008},
  month = {sep},
  note = {PIRSA:08090005 see, \url{https://pirsa.org}}
}

Abstract

I will discuss fine tuning in modified gravity models that can account for today’s dark energy. I will introduce some models where the underlying cosmological constant may be Planck scale but starts as a redundant coupling which can be eliminated by a field redefinition. The observed vacuum energy arises when the redundancy is explicitly broken. I’ll give a recipe for constructing models that realize this mechanism and satisfy all solar system constraints on gravity, including one based on Gauss-Bonnet gravity which provides a technically natural explanation for dark energy.

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