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By studying perturbations about the vacuum, we show that Hořava gravity suffers from two different strong coupling problems, extending all the way into the deep infra-red. The first of these is… (More)

We systematically explore the spectrum of gravitational perturbations in codimension-1 DGP braneworlds, and find a 4D ghost on the self-accelerating branch of solutions. The ghost appears for any… (More)

- Nemanja Kaloper, Antonio Padilla
- Physical review letters
- 2014

We propose a very simple reformulation of general relativity, which completely sequesters from gravity all of the vacuum energy from a matter sector, including all loop corrections and renders all… (More)

- Antonio Padilla
- 2003

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 to keep things as… (More)

We use a new, exact approach in calculating the energy density measured by an observer living on a brane embedded in a charged black hole spacetime. We find that the bulk Weyl tensor gives rise to… (More)

- Antonio Padilla
- 2001

We examine the cosmological evolution equations of de Sitter, flat and anti-de Sitter braneworlds sandwiched in between two n dimensional AdSSchwarzschild spacetimes. We are careful to use the… (More)

- Nemanja Kaloper, Antonio Padilla, David Stefanyszyn, George Zahariade
- Physical review letters
- 2016

We present a manifestly local, diffeomorphism invariant, and locally Poincaré invariant formulation of vacuum energy sequestering. In this theory, quantum vacuum energy generated by matter loops is… (More)

- Christos Charmousis, Edmund J. Copeland, Antonio Padilla, Paul M. Saffin
- Physical review letters
- 2012

Starting from the most general scalar-tensor theory with second-order field equations in four dimensions, we establish the unique action that will allow for the existence of a consistent self-tuning… (More)

- Antonio Padilla
- 2004

We consider a single 3-brane sitting in between two different five dimensional spacetimes. On each side of the brane, the bulk is a solution to GaussBonnet gravity, although the bare cosmological… (More)

- Antonio Padilla
- 2008

In this paper we provide a short review of the main results developed in hep-th/0604086. We focus on linearised vacuum perturbations about the selfaccelerating branch of solutions in the DGP model.… (More)