32 citations · 171 across the 20 of their papers we have counts for
21 papers
When quantum field theory kicks in: the relation between matter, gravity and energy
Antonio Ferreiro, Andrea Cavallaro
The existence of energy is the main criterion for (i) providing a common core to the materiality of all types of classical matter and (ii) denying that the gravitational field of G…
Deflating the Spacetime-Matter Dichotomy
Antonio Ferreiro, Alex Fleuren, Niels C. M. Martens
In this paper we analyse scalar-tensor theories-specific instances of which include mainstream inflation and dark energy models-in light of the spacetime-matter dichotomy. We argue…
The Birth of Gravitational Particle Creation: the Enduring Legacy of Leonard Parker's 1966 Thesis
Antonio Ferreiro, Jose Navarro-Salas, Silvia Pla
This paper offers a historical overview of the origins and enduring significance of gravitational particle creation, a groundbreaking discovery first formulated in Leonard Parker's…
Physical scale adiabatic regularization in cosmological spacetimes
Antonio Ferreiro, Samuel Monin, Francisco Torrenti
We develop a new regularization method for the stress-energy tensor and the two-point function of free quantum scalar fields propagating in cosmological spacetimes. We proceed by e…
Comment on "Gravitational Pair Production and Black Hole Evaporation"
Antonio Ferreiro, Jose Navarro-Salas, Silvia Pla
We scrutinize the recent Letter "Gravitational pair production and black hole evaporation" by M.F. Wondrak, W.D. van Suijlekom and H. Falcke [Phys. Rev. Lett. 130, 221502 (2023); a…
Instantaneous vacuum and States of Low Energy for a scalar field in cosmological backgrounds
Antonio Ferreiro, Silvia Pla
We construct the instantaneous vacuum state for a quantum scalar field coupled to another classical scalar field as described in [1]. We then compare it with the state of low energ…
Ultraviolet-regularized power spectrum without infrared distortions in cosmological spacetimes
Antonio Ferreiro, Francisco Torrenti
We reexamine the regularization of the two-point function of a scalar field in a Friedmann-Lemaitre-Robertson-Walker (FLRW) spacetime. Adiabatic regularization provides a set of su…
Adiabatic regularization and preferred vacuum state for the field theory in cosmological spacetimes
Antonio Ferreiro, Silvia Pla
We extend the method of adiabatic regularization by introducing an arbitrary parameter for a scalar field with quartic self-coupling in a Friedmann-Lemaître-Robertson-Walker (F…
Renormalization and decoupling for the Yukawa model in curved spacetime
Sergi Nadal-Gisbert, Antonio Ferreiro, José Navarro-Salas
We consider the renormalization of the one-loop effective action for the Yukawa interaction. We compute the beta functions in the generalized DeWitt-Schwinger subtraction scheme. F…
Renormalization, running couplings and decoupling for the Yukawa model in curved spacetime
Antonio Ferreiro, Sergi Nadal-Gisbert, José Navarro-Salas
The decoupling of heavy fields as required by the Appelquist-Carazzone theorem plays a fundamental role in the construction of any effective field theory. However, it is not a triv…
Instantaneous vacuum for Dirac fields with a Yukawa interaction in cosmological space-times
Antonio Ferreiro
We propose a suitable vacuum state for a quantized Dirac field interacting with a classical scalar field in a Friedman-Robertson-Walker-Lemaitre spacetime. This state is constructe…
Running gravitational couplings, decoupling, and curved spacetime renormalization
Antonio Ferreiro, Jose Navarro-Salas
We propose to slightly generalize the DeWitt-Schwinger adiabatic renormalization subtractions in curved space to include an arbitrary renormalization mass scale . The new predic…
R-summed form of adiabatic expansions in curved spacetime
Antonio Ferreiro, Jose Navarro-Salas, Silvia Pla
The Feynman propagator in curved spacetime admits an asymptotic (Schwinger-DeWitt) series expansion in derivatives of the metric. Remarkably, all terms in the series containing the…
Breaking of adiabatic invariance in the creation of particles by electromagnetic fields
Pau Beltrán-Palau, Antonio Ferreiro, Jose Navarro-Salas +1
Particles are spontaneously created from the vacuum by time-varying gravitational or electromagnetic backgrounds. It has been proven that the particle number operator in an expandi…
Adiabatic regularization with a Yukawa interaction
Antonio Ferreiro, Adrian del Rio, Jose Navarro-Salas +2
We extend the adiabatic regularization method for an expanding universe to include the Yukawa interaction between a quantized Dirac field and a homogeneous time-dependent scalar fi…
Pair creation in electric fields, renormalization, and backreaction
Antonio Ferreiro, Jose Navarro-Salas, Silvia Pla
We consider pair production phenomena in spatially homogeneous strong electric fields. We focus on spinor QED in two-dimensions and discuss the potential ambiguity in the adiabatic…
Running couplings from adiabatic regularization
Antonio Ferreiro, Jose Navarro-Salas
We extend the adiabatic regularization method by introducing an arbitrary mass scale in the construction of the subtraction terms. This allows us to obtain, in a very robust wa…
Role of gravity in the pair creation induced by electric fields
Antonio Ferreiro, Jose Navarro-Salas, Silvia Pla
We analyze the pair production induced by homogenous, time-dependent electric fields in an expanding space-time background. We point out that, in obtaining the semiclassical Maxwel…
Adiabatic expansions for Dirac fields, renormalization, and anomalies
J. Fernando Barbero G., Antonio Ferreiro, Jose Navarro-Salas +1
We introduce an iterative method to univocally determine the adiabatic expansion of the modes of Dirac fields in spatially homogeneous external backgrounds. We overcome the ambigui…
Pair creation in electric fields, anomalies, and renormalization of the electric current
Antonio Ferreiro, Jose Navarro-Salas
We investigate the Schwinger pair production phenomena in spatially homogeneous strong electric fields. We first consider scalar QED in four-dimensions and discuss the potential am…
Adiabatic regularization with a Yukawa interaction
A. del Rio, A. Ferreiro, J. Navarro-Salas +1
We extend the adiabatic regularization method for an expanding universe to include the Yukawa interaction between quantized Dirac fermions and a homogeneous background scalar field…