PIRSA:24070063 Conference

DOI10.48660/24070063

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

(2024). Non-linear gravitational waves in Horndeski gravity. Perimeter Institute. https://pirsa.org/24070063

Non-linear gravitational waves in Horndeski gravity. Perimeter Institute, Jul. 16, 2024, https://pirsa.org/24070063 

@misc{ pirsa_PIRSA:24070063,
  doi = {10.48660/24070063},
  url = {https://pirsa.org/24070063},
  author = {},
  keywords = {},
  language = {en},
  title = {Non-linear gravitational waves in Horndeski gravity},
  publisher = {Perimeter Institute},
  year = {2024},
  month = {jul},
  note = {PIRSA:24070063 see, \url{https://pirsa.org}}
}

Abstract

The non-linear dynamics of gravitational wave propagation in spacetime can contain drastic new phenomenology that is absent from the linearised theory. In this talk, I will probe the non-linear radiative regime of Horndeski gravity by making use of disformal field redefinition. I will discuss how disformal transformations alter the properties of congruences of geodesics and in particular how they can generate disformal gravitational waves at the fully non-linear level. I will illustrate this effect by presenting a new exact radiative solution in Horndeski gravity describing a scalar pulse. Analysing the non-linear dynamics of this new radiative solution will show that it contains tensorial gravitational waves generated by a purely time-dependent scalar monopole. This intriguing result is made possible by the higher-order nature of Horndeski gravity.

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