125 citations · 341 across the 9 of their papers we have counts for
9 papers
Inflaton Dynamics in Higher-Derivative Scalar-Tensor Theories of Gravity
Sam E. Brady, Katy Clough, Pau Figueras +1
During inflation, higher derivative terms in the gravitational action may play a significant role. Building on new stable formulations of four-derivative scalar-tensor theories, we…
Stable non-linear evolution in regularised higher derivative effective field theories
Pau Figueras, Áron D. Kovács, Shunhui Yao
We study properties of a recently proposed regularisation scheme to formulate the initial value problem for general (relativistic) effective field theories (EFTs) with arbitrary hi…
Well-posed evolution of field theories with anisotropic scaling: the Lifshitz scalar field in a black hole space-time
Marcelo E. Rubio, Áron D. Kovács, M. Herrero-Valea +2
Partial differential equations exhibiting an anisotropic scaling between space and time -- such as those of Horava-Lifshitz gravity -- have a dispersive nature. They contain higher…
The second law of black hole mechanics in effective field theory
Stefan Hollands, Áron D. Kovács, Harvey S. Reall
We investigate the second law of black hole mechanics in gravitational theories with higher derivative terms in the action. Wall has described a method for defining an entropy that…
On the construction of asymptotically flat initial data in scalar-tensor effective field theory
Aron D Kovacs
We study the constraint equations for a class of scalar-tensor effective field theories of gravity, including the operators up to derivatives in the action (ST). We…
Well-posed formulation of Lovelock and Horndeski theories
Aron D. Kovacs, Harvey S. Reall
We study the initial value problem for Lovelock and Horndeski theories of gravity. We show that the equations of motion of these theories can be written in a form that, at weak cou…
Well-posed formulation of scalar-tensor effective field theory
Aron D. Kovacs, Harvey S. Reall
Effective field theory provides a way of parameterizing strong-field deviations from General Relativity that might be observable in the gravitational waves emitted in a black hole…
Well-posedness of cubic Horndeski theories
Áron D. Kovács
We study the local well-posedness of the initial value problem for cubic Horndeski theories. Three different strongly hyperbolic modifications of the ADM formulation of the Einstei…
Frequency dependent magneto-optical conductivity in the generalized model
Áron Dániel Kovács, Gyula Dávid, Balázs Dóra +1
We have studied a generalized three band crossing model in 2D, the generalized lattice, ranging from the pseudospin-1 Dirac equation through a quadratic+flat band touching…