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States of low energy in the Schwinger effect
Álvaro Álvarez-Domínguez, Luis J. Garay, Mercedes Martín-Benito +1
States of low energy in cosmology minimise the energy density when smeared in a chosen time interval. We extend such construction to generic homogeneous (possibly anisotropic) part…
Operational realization of quantum vacuum ambiguities
Álvaro Álvarez-Domínguez, José A. R. Cembranos, Luis J. Garay +3
We provide a reinterpretation of the quantum vacuum ambiguities that one encounters when studying particle creation phenomena due to an external and time-dependent agent. We propos…
Late vacuum choice and slow roll approximation in gravitational particle production during reheating
Jose A. R. Cembranos, Luis J. Garay, Álvaro Parra-López +1
In the transition between inflation and reheating, the curvature scalar typically undergoes oscillations which have significant impact on the density of gravitationally produced pa…
Embedding Unimodular Gravity in String Theory
Luis J. Garay, Gerardo García-Moreno
Unimodular Gravity is a theory displaying Weyl rescalings of the metric and transverse (volume-preserving) diffeomorphisms as gauge symmetries, as opposed to the full set of diffeo…