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25 papers · 1 filter
Averaging inhomogeneities in scalar-tensor cosmology
Vincenzo Vitagliano, Stefano Liberati, Valerio Faraoni
The backreaction of inhomogeneities on the cosmic dynamics is studied in the context of scalar-tensor gravity. Due to terms of indefinite sign in the non-canonical effective energy…
On the ergoregion instability in rotating gravastars
Cecilia B. M. H. Chirenti, Luciano Rezzolla
The ergoregion instability is known to affect very compact objects that rotate very rapidly and do not possess a horizon. We present here a detailed analysis on the relevance of th…
Gravitational dynamics in Bose Einstein condensates
Florian Girelli, Stefano Liberati, Lorenzo Sindoni
Analogue models for gravity intend to provide a framework where matter and gravity, as well as their intertwined dynamics, emerge from degrees of freedom that have a priori nothing…
On the emergence of Lorentzian signature and scalar gravity
Florian Girelli, Stefano Liberati, Lorenzo Sindoni
In recent years, a growing momentum has been gained by the emergent gravity framework. Within the latter, the very concepts of geometry and gravitational interaction are not seen a…
Accurate evolutions of inspiralling neutron-star binaries: prompt and delayed collapse to black hole
Luca Baiotti, Bruno Giacomazzo, Luciano Rezzolla
Binary neutron-star (BNS) systems represent primary sources for the gravitational-wave (GW) detectors. We present a systematic investigation in full GR of the dynamics and GW emiss…
Fate of gravitational collapse in semiclassical gravity
Carlos Barcelo, Stefano Liberati, Sebastiano Sonego +1
While the outcome of gravitational collapse in classical general relativity is unquestionably a black hole, up to now no full and complete semiclassical description of black hole f…