54 citations · 177 across the 16 of their papers we have counts for
16 papers
Hawking Radiation from Universal Horizons
Mario Herrero-Valea, Stefano Liberati, Raquel Santos-Garcia
The persistence of a suitable notion of black hole thermodynamics in Lorentz breaking theories of gravity is not only a non-trivial consistency test for such theories, it is also a…
Massless Positivity in Graviton Exchange
Mario Herrero-Valea, Raquel Santos-Garcia, Anna Tokareva
We formulate Positivity Bounds for scattering amplitudes including exchange of massless particles. We generalize the standard construction through dispersion relations to include t…
Weighing the Vacuum Energy
Enrique Alvarez, Jesus Anero, Raquel Santos-Garcia
We discuss the weight of vacuum energy in various contexts. First, we compute the vacuum energy for flat spacetimes of the form , where $\mathbb{T}^…
Non-minimal Tinges of Unimodular Gravity
Mario Herrero-Valea, Raquel Santos-Garcia
Unimodular Gravity is normally assumed to be equivalent to General Relativity for all matters but the character of the Cosmological Constant. Here we discuss this equivalence in th…
Structural stability of spherical horizons
Enrique Alvarez, Jesus Anero, Raquel Santos-Garcia
This paper is concerned with the structural stability of spherical horizons. By this we mean stability with respect to variations of the second member of the corresponding differen…
A note on unimodular AdS supergravity
Jesus Anero, Carmelo P. Martin, Raquel Santos-Garcia
We put forward a unimodular anti-de Sitter supergravity theory off shell. This theory, where the Cosmological Constant does not couple to gravity, has a unique maximally…
CFT in Conformally Flat Spacetimes
Enrique Alvarez, Raquel Santos-Garcia
A new class of conformal field theories is presented, where the background gravitational field is conformally flat. Conformally flat (CF) spacetimes enjoy conformal properties quit…
Off-shell unimodular N=1, d=4 supergravity
Jesus Anero, Carmelo P. Martin, Raquel Santos-Garcia
We formulate a unimodular N=1, d=4 supergravity theory off shell. We see that the infinitesimal Grassmann parameters defining the unimodular supergravity transformations are constr…
Scalar Weyl anomalies and the dynamics of the gravitational field
Enrique Alvarez, Jesus Anero, Raquel Santos-Garcia
The generalization of scale invariance when gravitational effects are considered is Weyl invariance, namely, invariance under (global or local) rescalings of the metric. In this wo…
Conformal invariance versus Weyl invariance
Enrique Alvarez, Jesus Anero, Raquel Santos-Garcia
The most general lagrangian describing spin 2 particles in flat spacetime and containing operators up to (mass) dimension 6 is carefully analyzed, determining the precise condition…
A note on quasi-local energy
Enrique Alvarez, Jesus Anero, Guillermo Milans del Bosch +1
A definition of quasi-local energy in a gravitational field based upon its embedding into flat space is discussed. The outcome is not satisfactory from many points of view.
Massive Unimodular Gravity
Enrique Alvarez, Jesus Anero, Guillermo Milans del Bosch +1
A ghost free massive deformation of unimodular gravity (UG), in the spirit of {\em mimetic massive gravity}, is shown to exist. This construction avoids the no-go theorem for a Fie…
Quasi-local energy and compactification
Enrique Alvarez, Jesus Anero, Guillermo Milans del Bosch +1
Based on the quasi-local energy definition of Brown and York, we compute the integral of the trace of the extrinsic curvature over a codimension-2 hypersurface. In particular, we s…
Physical content of Quadratic Gravity
Enrique Alvarez, Jesus Anero, Sergio Gonzalez-Martin +1
We have recently undergone an analysis of gravitational theories as defined in first order formalism, where the metric and the connection are treated as independent fields. The phy…
A candidate for an UV completion: quadratic gravity in first order formalism
Enrique Alvarez, Jesus Anero, Sergio Gonzalez-Martin +1
We consider the most general action for gravity which is quadratic in curvature. In this case first order and second order formalisms are not equivalent. This framework is a good c…
One-loop divergences in first order Einstein-Hilbert gravity
Enrique Alvarez, Jesus Anero, Raquel Santos-Garcia
One-loop counterterms are computed in the first order formalism for the Einstein-Hilbert action with a minimally coupled scalar field using the background field method and the heat…