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20 papers · 2 filters
Quasi-stationary solutions of self-gravitating scalar fields around black holes
Nicolas Sanchis-Gual, Juan Carlos Degollado, Pedro J. Montero +1
Recent perturbative studies have shown the existence of long-lived, quasi-stationary configurations of scalar fields around black holes. In particular, such configurations have bee…
Equivalence of Adiabatic and DeWitt-Schwinger renormalization schemes
Adrian del Rio, Jose Navarro-Salas
We prove that adiabatic regularization and DeWitt-Schwinger point-splitting provide the same result for the renormalized expectation values of the stress-energy tensor for spin-$1/…
Total-variation-based methods for gravitational wave denoising
Alejandro Torres, Antonio Marquina, José A. Font +1
We describe new methods for denoising and detection of gravitational waves embedded in additive Gaussian noise. The methods are based on Total Variation denoising algorithms. These…
Electric-magnetic duality and renormalization in curved spacetimes
Ivan Agullo, Aitor Landete, Jose Navarro-Salas
We point out that the duality symmetry of free electromagnetism does not hold in the quantum theory if an arbitrary classical gravitational background is present. The symmetry brea…
Fully relativistic nonlinear cosmological evolution in spherical symmetry using the BSSN formalism
Jeremy Rekier, Isabel Cordero-Carrion, Andre Fuzfa
We present a fully relativistic numerical method for the study of cosmological problems using the Baumgarte-Shapiro-Shibata-Nakamura formalism on a dynamical Friedmann-Lemaître-Rob…
Renormalized stress-energy tensor for spin-1/2 fields in expanding universes
Adrian del Rio, Jose Navarro-Salas, Francisco Torrenti
We provide an explicit expression for the renormalized expectation value of the stress-energy tensor of a spin- field in a spatially flat FLRW universe. Its computation is bas…