40.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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16 papers · 2 filters
Improved (-Scheme) Effective Dynamics of Full Loop Quantum Gravity
Muxin Han, Hongguang Liu
We propose a new derivation from the full Loop Quantum Gravity (LQG) to the Loop Quantum Cosmology (LQC) improved -scheme effective dynamics, based on the reduced phase spac…
Boundary effects in General Relativity with tetrad variables
Roberto Oliveri, Simone Speziale
Varying the gravitational Lagrangian produces a boundary contribution that has various physical applications. It determines the right boundary terms to be added to the action once…
Hairy black holes in DHOST theories: Exploring disformal transformation as a solution-generating method
Jibril Ben Achour, Hongguang Liu, Shinji Mukohyama
Solutions-generating methods based on field redefinitions, such as conformal mapping, play an important role in investigating exact solutions in modified gravity. In this work, we…
Searching for classical geometries in spin foam amplitudes: a numerical method
Pietro Dona, Francesco Gozzini, Giorgio Sarno
We develop a numerical method to investigate the semiclassical limit of spin foam amplitudes with many vertices. We test it using the Ponzano-Regge model, a spin foam model for thr…
Primordial fluctuations from quantum gravity
Francesco Gozzini, Francesca Vidotto
We study fluctuations and correlations between spacial regions, generated by the primordial quantum gravitational phase of the universe. We do so by a numerical evaluation of Loren…
Minisuperspace results for causal dynamical triangulations
Bekir Baytas, Martin Bojowald, Sean Crowe +1
Detailed applications of minisuperspace methods are presented and compared with results obtained in recent years by means of causal dynamical triangulations (CDTs), mainly in the f…
The two-body potential of Vainshtein screened theories
Adrien Kuntz
Adding a light scalar degree of freedom to General Relativity often induces a fifth force whose magnitude is strongly constrained by laboratory experiments and solar system tests.…
Evaporating black-to-white hole
Pierre Martin-Dussaud, Carlo Rovelli
We construct and discuss the form of the (effective) spacetime geometry inside a black hole undergoing a quantum transition to a white hole, taking into account the back-reaction o…
Minisuperspace model of compact phase space gravity
Danilo Artigas Guimarey, Jakub Mielczarek, Carlo Rovelli
The kinematical phase space of classical gravitational field is flat (affine) and unbounded. Because of this, field variables may tend to infinity leading to appearance of singular…
How does the photon's spin affect Gravitational Wave measurements?
Loïc Marsot
We study the effect of the polarization of light beams on the time delay measured in Gravitational Wave experiments. To this end, we consider the Mathisson-Papapetrou-Dixon equatio…
Disformally Coupled Scalar Fields and Inspiralling Trajectories
Philippe Brax, Anne-Christine Davis, Adrien Kuntz
We show how a nearly massless scalar field conformally and disformally coupled to matter can affect the dynamics of two bodies in their inspiralling phase before merging. We discus…
Reflections on the Energy of Black Holes
Tevian Dray, Carlo Rovelli
Inside a black hole, there is no local way to say which side of a sphere is the inside, and which is the outside. One can easily be gulled by this fact into mixing up the sign of t…
Numerical study of the Lorentzian Engle-Pereira-Rovelli-Livine spin foam amplitude
Pietro Dona, Marco Fanizza, Giorgio Sarno +1
The Lorentzian EPRL spin foam amplitude for loop quantum gravity is a multi-dimensional non-compact integral of highly oscillating functions. Using a method based on the decomposit…
The subtle unphysical hypothesis of the firewall theorem
Carlo Rovelli
The black-hole firewall theorem derives a suspicious consequence (large energy-momentum density on the horizon of a black hole) from a set of seemingly reasonable hypotheses. I poi…
Effective field theory for gravitational radiation in scalar-tensor gravity
Adrien Kuntz, Federico Piazza, Filippo Vernizzi
A light scalar degree of freedom, as the one possibly responsible for the accelerated expansion of the Universe, could leave observable traces in the inspiral gravitational wave si…
Bianchi I effective dynamics in Quantum Reduced Loop Gravity
Emanuele Alesci, Gioele Botta, Giovanni Luzi +1
The effective quantum dynamics of Bianchi I spacetime is addressed within the statistical regularization scheme in Quantum Reduced Loop Gravity. The case of a minimally coupled mas…