603 citations · 6.9k across the 129 of their papers we have counts for
73 papers · 1 filter
Gravitational Aharonov-Bohm effect: theory and experiment
Zhongyou Mo, Leonardo Modesto
We study the quantum interference of two paths that enclose a slowly rotating, infinitely long, and infinitely thin cylindrical shell, using the spacetime metric induced by the gra…
Taming singularities and chaos in conformal gravity
Jiale Gu, Leonardo Modesto, Cosimo Bambi
We hereby address the cosmological singularity problem in a general gravitational theory invariant under Weyl conformal transformations. In particular, we focus on the Bianchi IX s…
Do Black Holes Exist?
Leonardo Modesto, Edoardo Rattu
We carefully investigate, extend, and shed new light on the McVittie exact solution of Einstein's gravity (EG) with the focus on the implications in the Universe we live in. It tur…
A Quantum Superposition of Black Hole Evaporation Histories: Recovering Unitarity
Ali Akil, Lorenzo Giannelli, Leonardo Modesto +3
Black hole evaporation is one of the most striking phenomena at the interface between gravity and quantum physics. In Hawking's semi-classical treatment, where matter is quantum me…
Quantum interference in the Kerr spacetime
Zhongyou Mo, Leonardo Modesto
The gravitational induced interference is here studied in the framework of Teleparallel Gravity. We derive the gravitational phase difference and we apply the result to the case of…
Regular multi-horizon Lee-Wick black holes
Nicolò Burzillà, Breno L. Giacchini, Tibério de Paula Netto +1
In this paper we carry out a detailed analysis of the static spherically symmetric solutions of a sixth-derivative Lee-Wick gravity model in the effective delta source approximatio…
On effective models of regular black holes inspired by higher-derivative and nonlocal gravity
Tibério de Paula Netto, Breno L. Giacchini, Nicolò Burzillà +1
In this work we study static spherically symmetric solutions of effective field equations related to local and nonlocal higher-derivative gravity models, based on their associated…
Quantum avoidance of Gödel's closed timelike curves
Zhe Zhao, Leonardo Modesto
In a large class of nonlocal as well as local higher derivative theories minimally coupled to the matter sector, we investigate the exactness of two different classes of homogeneou…
On the analytic extension of regular rotating black holes
Tian Zhou, Leonardo Modesto
We hereby focus on the analytic geodesic extension of several regular rotating black holes (RRBHs) obtained throughout the Newman-Janis algorithm starting from some popular spheric…
Semiclassical spacetimes at super-Planckian scales from delocalized sources
Ali Akil, Mariano Cadoni, Leonardo Modesto +2
We derive the gravitational field and the spacetime metric generated by sources in quantum superposition of different locations. We start by working in a Newtonian approximation, i…
Geodesic incompleteness of some popular regular black holes
Tian Zhou, Leonardo Modesto
Throughout the study of the geodesics of some popular spherically symmetric regular black holes, we hereby prove that the analytically extended Hayward black hole is geodetically i…
Testing quantum gravity with primordial gravitational waves
Gianluca Calcagni, Leonardo Modesto
We propose a testable alternative to inflation directly built in a very general class of ultraviolet complete theories of quantum gravity enjoying Weyl invariance. After the latter…
Early universe in quantum gravity
Leonardo Modesto, Gianluca Calcagni
We present a new picture of the early universe in finite nonlocal quantum gravity, which is Weyl invariant at the classical and quantum levels. The high-energy regime of the theory…
Geometric origin of the galaxies' dark side
Leonardo Modesto, Tian Zhou, Qiang Li
We show that Einstein's conformal gravity is able to explain simply on the geometric ground the galactic rotation curves without need to introduce any modification in both the grav…
Conformalons: a new class of black hole mimickers
Leonardo Modesto, Ali Akil, Cosimo Bambi
In any conformally invariant gravitational theory, the space of exact solutions is greatly enlarged. Therefore, we cannot exclude the Weyl's conformal invariance to be spontaneousl…
Action principle selection of regular black holes
Breno L. Giacchini, Tibério de Paula Netto, Leonardo Modesto
We elaborate on the role of higher-derivative curvature invariants as a quantum selection mechanism of regular spacetimes in the framework of the Lorentzian path integral approach…
Nonlocal Spacetime-Matter
Leonardo Modesto
We propose a nonlocal field theory for gravity in presence of matter consistent with perturbative unitarity, quantum finiteness, and other essential classical properties that we ar…
Higher-order regularity in local and nonlocal quantum gravity
Nicolò Burzillà, Breno L. Giacchini, Tibério de Paula Netto +1
In the present work we investigate the Newtonian limit of higher-derivative gravity theories with more than four derivatives in the action, including the non-analytic logarithmic t…
Newtonian potential in higher-derivative quantum gravity
Nicolò Burzillà, Breno L. Giacchini, Tibério de Paula Netto +1
We hereby derive the Newtonian metric potentials for the fourth-derivative gravity including the one-loop logarithm quantum corrections. It is explicitly shown that the behavior of…
Singularity-free black holes in conformal gravity: new observational constraints
Menglei Zhou, Askar B. Abdikamalov, Dimitry Ayzenberg +4
We consider the family of singularity-free rotating black hole solutions in Einstein's conformal gravity found in Bambi, Modesto & Rachwal (2017) and we constrain the value of the…
Approaching a spacetime singularity in conformal gravity
Leonardo Modesto, Hui-Yu Zhu, Jun-Yan Zhang
We hereby show that the Kasner spacetime turns out to be singularity-free in Einstein's conformal gravity in vacuum or in presence of matter. Such a statement is based on the regul…
Galactic rotation curves in Einstein's conformal gravity
Qiang Li, Leonardo Modesto
We show quantitatively that an exact solution of Einstein's conformal gravity can explain very well the galactic rotation curves for a sample of 104 galaxies without need for dark…
Nonlinear stability in nonlocal gravity
Fabio Briscese, Gianluca Calcagni, Leonardo Modesto
We address the stability issue of Ricci-flat and maximally symmetric spacetimes in nonlocal gravity to all perturbative orders in the gravitational perturbation. Assuming a potenti…
Nonlinear stability of Minkowski spacetime in Nonlocal Gravity
Fabio Briscese, Leonardo Modesto
We prove that the Minkowski spacetime is stable at nonlinear level and to all perturbative orders in the gravitational perturbation in a general class of nonlocal gravitational the…