15 papers
Tunnelling out of Starobinsky inflation: Raising the spectral tilt
Jose A. R. Cembranos, Jesús Luque, Javier Rubio
We propose a hybrid realization of Starobinsky inflation in which the inflationary epoch ends through vacuum decay. The model consists of an effective two-field system with a metas…
Hydrodynamical Misner-Sharp Formulation for Gravitational Collapse in Scalar-Tensor Theories
Jose A. R. Cembranos, Luis Diaz-Gimenez
We study the problem of gravitational collapse in the context of scalar-tensor theories of Gravity. We introduce a new hydrodynamical formulation in the Einstein frame, inspired by…
Quantization of Brane-Skyrmions via Physics-Informed Neural Networks
Jose A. R. Cembranos, Alberto GarcÃa MartÃn-Caro, Sergio S. Rentero
In this work, we investigate the canonical quantization of topological solitons appearing in braneworld scenarios. In particular, we focus on Brane-Skyrmions, topological field con…
Sensitivity forecasts for gravitational-wave detectors to dark matter decaying into gravitons
Jose A. R. Cembranos, Ãlvaro Cendal
Dark matter may not be perfectly stable, and its decay could generate distinctive gravitational-wave signatures. In this work, we present model-independent predictions for the stoc…
Estimation of gravitational production uncertainties
Jose A. R. Cembranos, Luis J. Garay, Ãlvaro Parra-López +1
Cosmological production of scalar, non-minimally coupled dark matter depends on the specifics of the inflationary model under consideration. We analyze both Starobinsky inflation a…
Influence of spatial curvature in cosmological particle production
Jose A. R. Cembranos, Luis J. Garay, Ãlvaro Parra-López
We analyze cosmological particle production driven by spacetime expansion in the early universe for homogeneous and isotropic cosmologies with positive, negative, and zero spatial…