PIRSA:20040080

Video URL

https://pirsa.org/20040080

Exploring the nonlinear dynamics of Einstein dilaton Gauss-Bonnet gravity

Ripley, J. (2020). Exploring the nonlinear dynamics of Einstein dilaton Gauss-Bonnet gravity. Perimeter Institute for Theoretical Physics. https://pirsa.org/20040080

Ripley, Justin. Exploring the nonlinear dynamics of Einstein dilaton Gauss-Bonnet gravity. Perimeter Institute for Theoretical Physics, Apr. 09, 2020, https://pirsa.org/20040080 

          @misc{ scivideos_PIRSA:20040080,
            doi = {10.48660/20040080},
            url = {https://pirsa.org/20040080},
            author = {Ripley, Justin},
            keywords = {Strong Gravity},
            language = {en},
            title = {Exploring the nonlinear dynamics of Einstein dilaton Gauss-Bonnet gravity},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2020},
            month = {apr},
            note = {PIRSA:20040080 see, \url{https://scivideos.org/pirsa/20040080}}
          }

Justin Ripley Princeton University

Talk numberPIRSA:20040080
DOI10.48660/20040080
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

We discuss several numerical and analytical studies of the modified gravity theory Einstein dilaton Gauss-Bonnet (EdGB) gravity. This class of modified gravity theories admit scalarized black hole solutions. The theory may then provide significantly different gravitational wave signatures during binary black hole merger as compared to general relativity, so that gravitational wave observations may provide new stringent constraints on EdGB gravity. The theory is also an important member of the Horndeski theories, which have been used to model theories of the early universe, including inflation and ekpyrosis. We describe our investigations of the self-consistency of EdGB gravity for spherically symmetric solutions that differ significantly from those in GR, including scalarized black hole solutions, and find that for solutions where the Gauss-Bonnet corrections to general relativity are not small, the theory no longer admits hyperbolic evolution. We discuss how an effective field theory interpretation of the equations of motion though should always guarantee (locally) hyperbolic evolution for the theory.