arXiv subjects

Jesús Anero

Publications and source records attributed to Jesús Anero.

8 recordsLinked to original sources

arXiv2025

Some aspects of QFT in non-inertial frames

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 modification of the definition of positive energy solutions are examined. The standard wisdom is confirmed that none of these phenomena is generic. This corroborates that in the general case there is no natural way to define positive frequencies, which is the standard road to define particles. In that sense, (as well as in others) non inertial frames are similar to curved spacetimes.

hep-th↗

arXiv2024

Some consequences of the Kerr-Schild gauge

Generalized Kerr-Schild nilpotent deformations of an arbitrary background spacetime $\overline{g}_{\m\n}(x)$ are considered. Those are of the form $\overline{g}_{\m\n}+l_\m l_\n$ with $l^2=0$. The relationship between the Ricci tensor of the background metric and the Ricci tensor of the deformed metric is found exactly. It consists of two terms, one is essentially the Fierz-Pauli operator, and the other is new. When the background is flat, the Kerr-Schild family is recovered. Novel examples for more general backgrounds (even including some simple sources) are discussed.

gr-qc↗

arXiv2024

The origin of the cosmological constant

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 work we try to flesh this out by studying in some detail a couple of examples, one from cosmology and the other from gravitational collapse.

hep-th↗

arXiv2024

Superposition of gravitational fields

Linear superposition of gravitational fields is shown to be possible for a large class of spacetimes, in some specific coordinates. Explicit examples are presented.

gr-qc↗

arXiv2023

The quantum dynamics of Lagrange multipliers

When implementing a non-linear constraint in quantum field theory by means of a Lagrange multiplier, $ł(x)$, it is often the case that quantum dynamics induce quadratic and even higher order terms in $ł(x)$, which then does not enforce the constraint anymore. This is illustrated in the case of Unimodular Gravity, where the constraint is that the metric tensor has to be unimodular ($g(x)\equiv \det\,g_{\m\n}(x)=-1$).

hep-th↗

arXiv2023

The fate of horizons under quantum corrections

We have studied a lagrangian in which the Einstein-Hilbert term is deformed by the Weyl cube operator, which is the lowest-dimension operator that is non-vanishing on shell and appears as a two-loop counterterm. There is a tension between the Schwarzschild de Sitter (SdS) spacetime and this operator, which we study in some detail.

hep-th↗

arXiv2022

Divergences of the scalar sector of quadratic gravity

The divergences coming from a particular sector of gravitational fluctuations around a generic background in general theories of quadratic gravity are analyzed. They can be summarized in a particular type of scalar model, whose properties are analyzed.

hep-th↗

arXiv2021

Some comments on the Hamiltonian for Unimodular Gravity

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 the second order formulation; this we call {\em educated}. It is often at variance with the {\em naive} approach, in which the lagrangian is taken as given exactly by the same expression as in the second order formulation; only the number and character of the independent variables changes. Namely, typically some of the momenta are now considered as coordinates. The ensuing Hamiltonians are thereby discussed and their physical differences pointed out.

gr-qc↗