151 citations · 1.4k across the 45 of their papers we have counts for
45 papers
Ghosts versus Unstable Particles in Quantum Field Theory
Luca Buoninfante
We elucidate the physical nature of ghosts above the multi-particle threshold by contrasting them with unstable particles in quantum field theory. We first consider the asymptotic…
Asymptotic Quantum Dynamics of Ghost Fields
Luca Buoninfante
The dressed propagator of a ghost coupled to ordinary fields develops a pair of complex conjugate poles in the first Riemann sheet above the multi-particle threshold. We study the…
Strict renormalizability as a paradigm for fundamental physics
Luca Buoninfante
An important theoretical achievement of the last century was the realization that strict renormalizability can be a powerful criterion to select Lagrangians in the framework of per…
Is the information loss problem a paradox?
Luca Buoninfante, Francesco Di Filippo
The aim of this chapter is twofold. First, we introduce the information loss problem; second, we provide a critical assessment by thoroughly inspecting the assumptions underlying i…
Remarks on ghost resonances
Luca Buoninfante
In this paper we study various aspects of ghost resonances: the resummation that leads to the dressed propagator, the poles locations, the analytic continuation into the second Rie…
Visions in Quantum Gravity
Luca Buoninfante, Benjamin Knorr, K. Sravan Kumar +36
To deepen our understanding of Quantum Gravity and its connections with black holes and cosmology, building a common language and exchanging ideas across different approaches is cr…
Lectures in Quantum Gravity
Ivano Basile, Luca Buoninfante, Francesco Di Filippo +3
Formulating a quantum theory of gravity lies at the heart of fundamental theoretical physics. This collection of lecture notes encompasses a selection of topics that were covered i…
Non-local positivity bounds: islands in Terra Incognita
Luca Buoninfante, Long-Qi Shao, Anna Tokareva
The requirements of unitarity and causality lead to significant constraints on the Wilson coefficients of an EFT expansion, known as positivity bounds. Their standard derivation re…
Black Holes Inside and Out 2024: visions for the future of black hole physics
Niayesh Afshordi, Abhay Ashtekar, Enrico Barausse +27
The gravitational physics landscape is evolving rapidly, driven by our ability to study strong-field regions, in particular black holes. Black Holes Inside and Out gathered world e…
Dust collapse and horizon formation in Quadratic Gravity
Luca Buoninfante, Francesco Di Filippo, Ivan Kolář +1
Quadratic Gravity supplements the Einstein-Hilbert action by terms quadratic in the spacetime curvature. This leads to a rich phase space of static, compact gravitating objects inc…
Massless and Partially Massless Limits in Quadratic Gravity
Luca Buoninfante
In the context of perturbative quantum field theory, the addition of quadratic-curvature invariants to the Einstein-Hilbert action makes it possible to achieve strict renormalizabi…
Neutrino decoherence and violation of the strong equivalence principle
Luca Buoninfante, Giuseppe Gaetano Luciano, Luciano Petruzziello +1
We analyze the dynamics of neutrino Gaussian wave-packets, the damping of flavor oscillations and decoherence effects within the framework of extended theories of gravity. In parti…
New lower bounds on scattering amplitudes: non-locality constraints
Luca Buoninfante, Junsei Tokuda, Masahide Yamaguchi
Under reasonable working assumptions including the polynomial boundedness, one proves the well-known Cerulus-Martin lower bound on how fast an elastic scattering amplitude can decr…
Black holes in non-local gravity
Luca Buoninfante, Breno L. Giacchini, Tibério de Paula Netto
In this chapter we present a status report of black hole-like solutions in non-local theories of gravity in which the Lagrangians are at least quadratic in curvature and contain sp…
On the contour prescriptions in string-inspired nonlocal field theories
Luca Buoninfante
In quantum field theory, a consistent prescription to define and deform integration contours in the complex energy plane is needed to evaluate loop integrals and compute scattering…
Topological defects in nonlocal field theories
Luca Buoninfante, Yuichi Miyashita, Masahide Yamaguchi
In this paper, we study for the first time topological defects in the context of nonlocal field theories in which Lagrangians contain infinite-order differential operators. In part…
On the assumptions leading to the information loss paradox
Luca Buoninfante, Francesco Di Filippo, Shinji Mukohyama
The information loss paradox is usually stated as an incompatibility between general relativity and quantum mechanics. However, the assumptions leading to the problem are often ove…
Maximal Acceleration, Reciprocity & Nonlocality
Luca Buoninfante
The existence of a fundamental scale is expected to be a key feature of quantum gravity. Many approaches take this property as a starting assumption. Here, instead, we take a less…
Quantum interference in external gravitational fields beyond General Relativity
Luca Buoninfante, Gaetano Lambiase, Luciano Petruzziello
In this paper, we study the phenomenon of quantum interference in the presence of external gravitational fields described by alternative theories of gravity. We analyze both non-re…
Gravitational field of scalar lumps in higher-derivative gravity
Luca Buoninfante, Yuichi Miyashita
We study the gravitational field sourced by localized scalar fields (lumps) in higher-derivative theories of gravity. By working in a static and spherically symmetric configuration…
Einstein, Planck and Vera Rubin: relevant encounters between the Cosmological and the Quantum Worlds
Paolo Salucci, Giampiero Esposito, Gaetano Lambiase +38
In Cosmology and in Fundamental Physics there is a crucial question like: where the elusive substance that we call Dark Matter is hidden in the Universe and what is it made of?, th…
Bekenstein bound and uncertainty relations
Luca Buoninfante, Giuseppe Gaetano Luciano, Luciano Petruzziello +1
The non zero value of Planck constant underlies the emergence of several inequalities that must be satisfied in the quantum realm, the most prominent one being Heisenberg Uncer…
Light bending by a slowly rotating source in quadratic theories of gravity
Luca Buoninfante, Breno L. Giacchini
In this paper we study the light bending caused by a slowly rotating source in the context of quadratic theories of gravity, in which the Einstein--Hilbert action is extended by ad…
How does a dark compact object ringdown?
Elisa Maggio, Luca Buoninfante, Anupam Mazumdar +1
A generic feature of nearly out-of-equilibrium dissipative systems is that they resonate through a set of quasinormal modes. Black holes - the absorbing objects par excellence - ar…