404 citations · 3.5k across the 37 of their papers we have counts for
3 papers · 1 filter
Degenerate higher order scalar-tensor theories beyond Horndeski up to cubic order
Jibril Ben Achour, Marco Crisostomi, Kazuya Koyama +3
We present all scalar-tensor Lagrangians that are cubic in second derivatives of a scalar field, and that are degenerate, hence avoiding Ostrogradsky instabilities. Thanks to the e…
Extended Scalar-Tensor Theories of Gravity
Marco Crisostomi, Kazuya Koyama, Gianmassimo Tasinato
We study new consistent scalar-tensor theories of gravity recently introduced by Langlois and Noui with potentially interesting cosmological applications. We derive the conditions…
Horndeski: beyond, or not beyond?
Marco Crisostomi, Matthew Hull, Kazuya Koyama +1
Determining the most general, consistent scalar tensor theory of gravity is important for building models of inflation and dark energy. In this work we investigate the number of de…