45 citations · 395 across the 24 of their papers we have counts for
9 papers · 1 filter
Primary black-hole scalar charges and kinetic screening in -essence-Gauss-Bonnet gravity
Guillermo Lara, Georg Trenkler, Leonardo G. Trombetta
Black holes beyond General Relativity may carry non-standard charges that impact their phenomenology. We study how the scalar charge that is induced by the scalar-Gauss-Bonnet coup…
Large black-hole scalar charges induced by cosmology in Horndeski theories
Eugeny Babichev, Gilles Esposito-Farèse, Ignacy Sawicki +1
The regularity of black hole solutions, embedded in an expanding Universe, is studied in a subclass of Horndeski theories, namely the sum of the simplest quadratic, cubic and quint…
Mergers of hairy black holes: Constraining topological couplings from entropy
Kabir Chakravarti, Amit Reza, Leonardo G. Trombetta
Hairy black-holes are a unique prediction of certain theories that extend General Relativity (GR) with a scalar field. The presence of scalar hair is reflected non-trivially in the…
The cosmic trimmer: Black-hole hair in scalar-Gauss-Bonnet gravity is altered by cosmology
Eugeny Babichev, Ignacy Sawicki, Leonardo G. Trombetta
Static black holes in general relativity modified by a linear scalar coupling to the Gauss-Bonnet invariant always carry hair. We show that the same mechanism that creates the hair…
Symmetric Teleparallel Gauss-Bonnet Gravity and its Extensions
Juan Manuel Armaleo, Sebastian Bahamonde, Georg Trenkler +1
General Teleparallel theories assume that curvature is vanishing in which case gravity can be solely represented by torsion and/or nonmetricity. Using differential form language, w…
Constraining a stochastic variation of the gravitational coupling with binary systems
Francisco D. Mazzitelli, Leonardo G. Trombetta
We consider the effect of stochastic fluctuations of the gravitational coupling G on the evolution of binary systems. We work at an elementary level, in the Newtonian limit, and fo…
Symmetric Teleparallel Horndeski Gravity
Sebastian Bahamonde, Georg Trenkler, Leonardo G. Trombetta +1
Horndeski gravity is the most general scalar-tensor theory with one scalar field leading to second-order Euler-Lagrange field equations for the metric and scalar field, and it is b…
Black Hole Ringdown as a Probe for Dark Energy
Johannes Noller, Luca Santoni, Enrico Trincherini +1
Under the assumption that a dynamical scalar field is responsible for the current acceleration of the Universe, we explore the possibility of probing its physics in black hole merg…
Comment on: "How the huge energy of quantum vacuum gravitates to drive the slow accelerating expansion of the Universe"
Francisco D. Mazzitelli, Leonardo G. Trombetta
In a recent paper (Phys. Rev. D95, 103504 (2017)) it is argued that, due to the fluctuations around its mean value, vacuum energy gravitates differently from what previously assume…