45 citations · 395 across the 24 of their papers we have counts for
13 papers · 1 filter
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…
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-…
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…
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…
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…
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…