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Asymptotically flat vacuum solutions in order-reduced semiclassical gravity
Julio Arrechea, Carlos Barceló, Raúl Carballo-Rubio +1
We investigate the effects of quantum backreaction on the Schwarzschild geometry in the semiclassical approximation. The renormalized stress-energy tensor (RSET) of a scalar field…
Warp Drive Aerodynamics
Carlos Barceló, Valentin Boyanov, Luis J. Garay +2
In this work we analyse the potential for a warp drive spacetime to develop instabilities due to the presence of quantum matter. Particularly, we look for points of infinite bluesh…
Causal structure of accelerating black holes
Jose A. R. Cembranos, Luis J. Garay, Sergio A. Ortega
Accelerating black holes are described by the so-called C-metric. In this work, we analyse the causal structure of such black holes by using null geodesics. We construct explicitly…
Unimodular Gravity vs General Relativity: A status report
Raúl Carballo-Rubio, Luis J. Garay, Gerardo García-Moreno
Unimodular Gravity is an alternative to General Relativity (GR) which, however, is so closely related to the latter that one can wonder to what extent they are different. The diffe…
Noether charge formalism for Weyl invariant theories of gravity
Ana Alonso-Serrano, Luis J. Garay, Marek Liška
Gravitational theories invariant under transverse diffeomorphisms and Weyl transformations have the same classical solutions as the corresponding fully diffeomorphism invariant the…
Noether charge formalism for Weyl transverse gravity
Ana Alonso-Serrano, Luis J. Garay, Marek Liška
Weyl transverse gravity is a gravitational theory that is invariant under transverse diffeomorphisms and Weyl transformations. It is characterised by having the same classical solu…
Classical mass inflation vs semiclassical inner horizon inflation
Carlos Barceló, Valentin Boyanov, Raúl Carballo-Rubio +1
We analyse the geometry of a spherically symmetric black hole with an inner and outer apparent horizon which is perturbed by spherical null shells of matter. On a classical level w…
Generalized quantum Vlasov equation for particle creation and unitary dynamics
Álvaro Álvarez-Domínguez, Luis J. Garay, Mercedes Martín-Benito
The loss of time-translational invariance caused by a time-dependent external agent leads to particle creation effects in quantum field theory. This phenomenon results in ambiguiti…