PIRSA:24070088 Conference

DOI10.48660/24070088

Conference/School: 50 Years of Horndeski Gravity: Exploring Modified Gravity

Takahashi, K. (2024). Generalized disformal Horndeski theories: consistency of matter coupling and cosmological perturbations. Perimeter Institute. https://pirsa.org/24070088

Takahashi, Kazufumi. Generalized disformal Horndeski theories: consistency of matter coupling and cosmological perturbations. Perimeter Institute, Jul. 15, 2024, https://pirsa.org/24070088 

@misc{ pirsa_PIRSA:24070088,
  doi = {10.48660/24070088},
  url = {https://pirsa.org/24070088},
  author = {Takahashi, Kazufumi},
  keywords = {},
  language = {en},
  title = {Generalized disformal Horndeski theories: consistency of matter coupling and cosmological perturbations},
  publisher = {Perimeter Institute},
  year = {2024},
  month = {jul},
  note = {PIRSA:24070088 see, \url{https://pirsa.org}}
}

Abstract

Invertible disformal transformations are a useful tool to investigate ghost-free scalar-tensor theories. By performing a higher-derivative generalization of the invertible disformal transformation on Horndeski theories, we construct a novel class of ghost-free scalar-tensor theories, which we dub generalized disformal Horndeski theories. In the talk, I will clarify the basic idea for constructing the invertible disformal transformation with higher derivatives. I will also discuss some aspects of the generalized disformal Horndeski theories, including the consistency of matter coupling and cosmological perturbations.

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