from 30 May 2023 to 1 June 2023
Lisbon
Europe/Lisbon timezone

Stability Conditions for the Horndeski Scalar Field Gravity Model

31 May 2023, 14:50
25m
Lisbon

Lisbon

Faculdade de Ciências da Universidade de Lisboa (PT)

Speaker

Cláudio GOMES

Description

We constrain the viable models of Horndeski gravity after the GWs events by resorting to the Witten positive energy theorem. We find that the free function G3(ϕ,X) in the Lagrangian is con- strained to be a function solely of the scalar field, G3(ϕ). In addition,relations among the free functions are found. Other criteria for stability are also analysed, such as the attractiveness of gravity, and the Dolgov-Kawasacki instability. Some applications for cosmology are discussed.

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