45 citations · 395 across the 24 of their papers we have counts for
24 papers
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…
IR side of bounds on Theories with Spontaneously Broken Lorentz Symmetry
Francesco Serra, Leonardo G. Trombetta
In nature, some UV features of dynamics are reflected in IR quantities. In fully relativistic theories, this connection can be probed through the analyticity properties of scatteri…
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…
Five-point Superluminality Bounds
Francesco Serra, Leonardo G. Trombetta
We investigate how the speed of propagation of physical excitations is encoded in the coefficients of five-point interactions. This leads to a superluminality bound on scalar five-…
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…
Stochastic particle creation: from the dynamical Casimir effect to cosmology
Matías Mantiñan, Francisco D. Mazzitelli, Leonardo G. Trombetta
We study a stochastic version of the dynamical Casimir effect, computing the particle creation inside a cavity produced by a random motion of one of its walls. We first present a c…
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…
Causality Constraints on Black Holes beyond GR
Francesco Serra, Javi Serra, Enrico Trincherini +1
We derive causality constraints on the simplest scalar-tensor theories in which black holes differ from what General Relativity predicts, a scalar coupled to the Gauss-Bonnet or th…
Scalar-tensor cosmologies without screening
Johannes Noller, Luca Santoni, Enrico Trincherini +1
Scalar-tensor theories are frequently only consistent with fifth force constraints in the presence of a screening mechanism, namely in order to suppress an otherwise unacceptably l…
Hairy Black-holes in Shift-symmetric Theories
Paolo Creminelli, Nicolás Loayza, Francesco Serra +2
Scalar hair of black holes in theories with a shift symmetry are constrained by the no-hair theorem of Hui and Nicolis, assuming spherical symmetry, time-independence of the scalar…
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…
To the sphere and back again: de Sitter infrared correlators at NTLO in 1/N
Diana López Nacir, Francisco D. Mazzitelli, Leonardo G. Trombetta
We analyze the infrared behavior of the two and four-point functions for the massless model in Lorentzian de Sitter spacetime, using the expansion. Our approach is bas…
Long distance behavior of -model correlators in de Sitter space and the resummation of secular terms
Diana López Nacir, Francisco D. Mazzitelli, Leonardo G. Trombetta
We analyze the long distance behavior of the two-point functions for an interacting scalar model in de Sitter spacetime. Following our previous work, this behavior is analyz…
Behind Horndeski: Structurally Robust Higher Derivative EFTs
Luca Santoni, Enrico Trincherini, Leonardo G. Trombetta
Higher derivative scalar interactions can give rise to interesting cosmological scenarios. We present a complete classification of such operators that can yield sizeable effects wi…
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…
Nonlocal effective actions in semiclassical gravity: thermal effects in stationary geometries
M. Elías, F. D. Mazzitelli, L. G. Trombetta
We compute the gravitational effective action by integrating out quantum matter fields in a weak gravitational field, using the Schwinger-Keldysh (in-in) formalism. We pay particul…
Massless Interacting Scalar Fields in de Sitter space
Diana López Nacir, Francisco D. Mazzitelli, Leonardo G. Trombetta
We present a method to compute the two-point functions for an scalar field model in de Sitter spacetime, avoiding the well known infrared problems for massless fields. The m…
model in Euclidean de Sitter space: beyond the leading infrared approximation
Diana López Nacir, Francisco D. Mazzitelli, Leonardo G. Trombetta
We consider an scalar field model with quartic interaction in -dimensional Euclidean de Sitter space. In order to avoid the problems of the standard perturbative calculat…
Hartree approximation in curved spacetimes revisited II: The semiclassical Einstein equations and de Sitter self-consistent solutions
Diana L. López Nacir, Francisco D. Mazzitelli, Leonardo G. Trombetta
We consider the semiclassical Einstein equations (SEE) in the presence of a quantum scalar field with self-interaction . Working in the Hartree truncation of the two-particle…
The Hartree approximation in curved spacetimes revisited I: the effective potential in de Sitter
Diana L. López Nacir, Francisco D. Mazzitelli, Leonardo G. Trombetta
We consider a quantum scalar field with λϕ^4 interaction in curved spacetimes. The quantum effects are taken into account nonperturbatively using the Hartree approximation to the 2…
Lifshitz scalar fields: one loop renormalization in curved backgrounds
Diana L. López Nacir, Francisco D. Mazzitelli, Leonardo G. Trombetta
We consider an interacting Lifshitz field with z=3 in a curved spacetime. We analyze the renormalizability of the theory for interactions of the form lambda phi^n, with arbitrary e…