37 citations · 152 across the 15 of their papers we have counts for
15 papers
Analytic backreaction of a scalar wig on a Schwarzschild black hole
Marco de Cesare, Manuel Del Piano, Carlos A. R. Herdeiro
We analytically determine the leading backreaction of a spherically symmetric massive complex scalar quasi-bound state (with mass ) on a Schwarzschild black hole with (initial)…
Arrows of time in bouncing cosmologies
Marco de Cesare
Different approaches to quantum gravity, such as loop quantum cosmology and group field theory, predict the resolution of the initial cosmological singularity via a bounce: a regul…
Perturbations of bimetric gravity on most general spherically symmetric spacetimes
David Brizuela, Marco de Cesare, Araceli Soler Oficial
We present a formalism to study linear perturbations of bimetric gravity on any spherically symmetric background, including dynamical spacetimes. The setup is based on the Gerlach-…
Gravitational wave oscillations in bimetric cosmology
David Brizuela, Marco de Cesare, Araceli Soler Oficial
Unlike general relativity, in bimetric gravity linear gravitational waves do not evolve as free fields. In this theory there are two types of tensor perturbations, whose interactio…
Backreaction of scalar waves on black holes at low frequencies
Marco de Cesare, Roberto Oliveri
We study the accretion of a Schwarzschild black hole due to spherically symmetric perturbations sourced by a minimally coupled massless scalar field. The backreaction of the black…
Generalized boundary conditions in closed cosmologies
David Brizuela, Marco de Cesare
Considering a generalization of the Gibbons-Hawking-York covariant boundary action that depends on both the extrinsic and the intrinsic geometry of the boundary, we derive boundary…
Evolving black hole with scalar field accretion
Marco de Cesare, Roberto Oliveri
We obtain approximate analytical solutions of the Einstein equations close to the trapping horizon for a dynamical spherically symmetric black hole in the presence of a minimally c…
Interacting dark sector from the trace-free Einstein equations: cosmological perturbations with no instability
Marco de Cesare, Edward Wilson-Ewing
In trace-free Einstein gravity, the stress-energy tensor of matter is not necessarily conserved and so the theory offers a natural framework for interacting dark energy models wher…
Field theoretical approach to gravitational waves
Marco de Cesare, R. Oliveri, J. W. van Holten
The aim of these notes is to give an accessible and self-contained introduction to the theory of gravitational waves as the theory of a relativistic symmetric tensor field in a Min…
Local conformal symmetry in non-Riemannian geometry and the origin of physical scales
Marco de Cesare, John W. Moffat, Mairi Sakellariadou
We introduce an extension of the Standard Model and General Relativity built upon the principle of local conformal invariance, which represents a generalization of a previous work…
Effective cosmological constant induced by stochastic fluctuations of Newton's constant
Marco de Cesare, Fedele Lizzi, Mairi Sakellariadou
We consider implications of the microscopic dynamics of spacetime for the evolution of cosmological models. We argue that quantum geometry effects may lead to stochastic fluctuatio…
Accelerated expansion of the Universe without an inflaton and resolution of the initial singularity from Group Field Theory condensates
Marco de Cesare, Mairi Sakellariadou
We study the expansion of the Universe using an effective Friedmann equation obtained from the dynamics of GFT (Group Field Theory) isotropic condensates. The evolution equations a…
Semiclassical solutions of generalized Wheeler-DeWitt cosmology
Marco de Cesare, Maria Vittoria Gargiulo, Mairi Sakellariadou
We consider an extension of WDW minisuperpace cosmology with additional interaction terms that preserve the linear structure of the theory. General perturbative methods are develop…
The Gribov phenomenon in flat and curved spaces
Marco de Cesare
The quantization of Yang-Mills theories relies on the gauge-fixing procedure. However, in the non-Abelian case this procedure leads to the well known Gribov ambiguity. In order to…
Size of the Gribov region in curved spacetime
Marco de Cesare, Giampiero Esposito, Hossein Ghorbani
Recent work in the literature has argued that the joint effect of spacetime curvature and the Gribov ambiguity may introduce further modifications to the Green functions in the inf…