3 papers
gr-qc2025
Scalar fields from nonlinear sigma models on black hole spacetimes
Ludovico Machet, Llibert Aresté Saló
Scalar fields with non-trivial kinetic term derived from a nonlinear sigma model are motivated by UV completions of gravity such as string theory. We discuss the $\mathrm{SL}(2,\ma…
gr-qc2025
Challenges in the nonlinear evolution of unequal mass binaries in sGB gravity
Llibert Aresté Saló, Daniela D. Doneva, Katy Clough +2
It has only recently become possible to simulate the full nonlinear dynamics of binary black holes in scalar-Gauss-Bonnet theories of gravity. The simulations remain technically ch…
gr-qc2023
Solving the initial conditions problem for modified gravity theories
Sam E. Brady, Llibert Aresté Saló, Katy Clough +2
Modified gravity theories such as Einstein scalar Gauss Bonnet (EsGB) contain higher derivative terms in the spacetime curvature in their action, which results in modifications to…