4 papers
Some aspects of QFT in non-inertial frames
Enrique Álvarez, Jesús Anero
Some aspects of quantum field theory in a general (i.e. non inertial) frame of Minkowski spacetime are studied. Conditions for the presence of horizons as well as for the modificat…
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.
The origin of the cosmological constant
Enrique Álvarez, Jesús Anero, Irene Sánchez-Ruiz
It is well-known that in unimodular gravity the cosmological constant is not sourced by a constant energy density, but rather appears as some sort of integration constant. In this…