48 citations · 107 across the 34 of their papers we have counts for
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Generalized Kerr-Schild gauge
Enrique Alvarez, Jesus Anero
The Kerr-Schild gauge is generalized to the case that the vector generating the deformation is not null. Contrary to naive expectations, this vector generates a finite expansion fo…
Some consequences of the Kerr-Schild gauge
Enrique Álvarez, Jesús Anero
Generalized Kerr-Schild nilpotent deformations of an arbitrary background spacetime $\overline{g}_{\m\n}(x)$ are considered. Those are of the form $\overline{g}_{\m\n}+l_\m l_\n$ w…
Superposition of gravitational fields
Enrique Álvarez, Jesús Anero
Linear superposition of gravitational fields is shown to be possible for a large class of spacetimes, in some specific coordinates. Explicit examples are presented.
Physical charges versus conformal invariance in unimodular gravity
Enrique Alvarez, Jesus Anero, Irene Sanchez-Ruiz
Unimodularity can be implemented in different ways. In this paper we consider only the formulation of Unimodular Gravity in which the unimodular metric is obtained out of an unrest…
Variations on the Goroff-Sagnotti operator
Enrique Álvarez, Jesus Anero, Eduardo Velasco-Aja
The effect of modifying General Relativity with the addition of some higher dimensional operators, generalizations of the Goroff-Sagnotti operator, is discussed. We determine in pa…
Quantum corrections to Einstein's equations
Eduardo Velasco-Aja, Jesus Anero
In this master thesis, the Frobenius power series method is used to find spherically symmetric and static vacuum solutions to quadratic and cubic gravitational actions, representin…
Unimodular Cosmological models
Enrique Alvarez, Jesus Anero
It is claimed that in the unimodular gravity framework the observational fact of exponential expansion of the universe cannot be taken as evidence for the presence for a cosmologic…
Some comments on the Hamiltonian for Unimodular Gravity
Enrique Álvarez, Jesús Anero
Several alternative formulations of the first order approach to unimodular gravity are presented. There is always a particular one such that it is {\em classically} equivalent to t…