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10 papers · 2 filters
Lorentzian spinfoam propagator
Eugenio Bianchi, You Ding
The two-point correlation function is calculated in the Lorentzian EPRL spinfoam model, and shown to match with the one in Regge calculus in a proper limit: large boundary spins, a…
Resonance and absorption spectra of the Schwarzschild black hole for massive scalar perturbations: a complex angular momentum analysis
Yves Décanini, Antoine Folacci, Bernard Raffaelli
We reexamine some aspects of scattering by a Schwarzschild black hole in the framework of complex angular momentum techniques. More precisely, we consider, for massive scalar pertu…
Many-nodes/many-links spinfoam: the homogeneous and isotropic case
Francesca Vidotto
I compute the Lorentzian EPRL/FK/KKL spinfoam vertex amplitude for regular graphs, with an arbitrary number of links and nodes, and coherent states peaked on a homogeneous and isot…
Black hole entropy and isolated horizons thermodynamics
Amit Ghosh, Alejandro Perez
We present a statistical mechanical calculation of the thermodynamical properties of (non rotating) isolated horizons. The introduction of Planck scale allows for the definition of…
Complex Ashtekar variables, the Kodama state and spinfoam gravity
Wolfgang Wieland
Starting from a Hamiltonian description of four dimensional general relativity in presence of a cosmological constant we perform the program of canonical quantisation. This is done…
Pre-Big-Bang Cosmology and Circles in the Cosmic Microwave Background
William Nelson, Edward Wilson-Ewing
We examine the possibility that circles in the cosmic microwave background could be formed by the interaction of a gravitational wave pulse emitted in some pre-big-bang phase of th…
Universality of high-energy absorption cross sections for black holes
Yves Décanini, Gilles Esposito-Farèse, Antoine Folacci
We consider the absorption problem for a massless scalar field propagating in static and spherically symmetric black holes of arbitrary dimension endowed with a photon sphere. For…
Discreteness of the volume of space from Bohr-Sommerfeld quantization
Eugenio Bianchi, Hal M. Haggard
A major challenge for any theory of quantum gravity is to quantize general relativity while retaining some part of its geometrical character. We present new evidence for the idea t…
Zakopane lectures on loop gravity
Carlo Rovelli
These are introductory lectures on loop quantum gravity. The theory is presented in self-contained form, without emphasis on its derivation from classical general relativity. Dynam…
2+1 gravity with positive cosmological constant in LQG: a proposal for the physical state
Daniele Pranzetti
In this paper, I investigate the possible quantization, in the context of LQG, of three dimensional gravity in the case of positive cosmological constant Λ and try to make contact…