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Generalised scalar-tensor theories and self-tuning
Edmund J. Copeland, Sukhraj Ghataore, Florian Niedermann +1
We explore a family of generalised scalar-tensor theories that exhibit self-tuning to low scale anti de Sitter vacua, even in the presence of a large cosmological constant. We are…
Dark energy after GW170817, revisited
Edmund J. Copeland, Michael Kopp, Antonio Padilla +2
We revisit the status of scalar-tensor theories with applications to dark energy in the aftermath of the gravitational wave signal GW170817 and its optical counterpart GRB170817A.…
A note on classical and quantum unimodular gravity
Antonio Padilla, Ippocratis D. Saltas
We discuss unimodular gravity at a classical level, and in terms of its extension into the UV through an appropriate path integral representation. Classically, unimodular gravity i…
Covariant multi-galileons and their generalisation
Antonio Padilla, Vishagan Sivanesan
We find a covariant completion of the flat-space multi-galileon theory, preserving second-order field equations. We then generalise this to arrive at an enlarged class of second or…
Boundary Terms and Junction Conditions for Generalized Scalar-Tensor Theories
Antonio Padilla, Vishagan Sivanesan
We compute the boundary terms and junction conditions for Horndeski's panoptic class of scalar-tensor theories, and write the bulk and boundary equations of motion in explicitly se…
Surface terms and the Gauss-Bonnet Hamiltonian
Antonio Padilla
We derive the gravitational Hamiltonian starting from the Gauss-Bonnet action, keeping track of all surface terms. This is done using the language of orthonormal frames and forms t…