Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of California, BerkeleyUS1.3k papers
- Goddard Space Flight CenterUS1.3k papers
- California Institute of TechnologyUS1.3k papers
- The Ohio State UniversityUS1.2k papers
- Centre National de la Recherche ScientifiqueFR1.1k papers
- Massachusetts Institute of TechnologyUS1.1k papers
- University of Maryland, College ParkUS1k papers
- Center for Astrophysics Harvard & SmithsonianUS975 papers
- Lawrence Berkeley National LaboratoryUS897 papers
- University of ChicagoUS889 papers
- University of WashingtonUS868 papers
- Yale UniversityUS848 papers
19 papers · 2 filters
The geometry of quantum spin networks
Roumen Borissov, Seth Major, Lee Smolin
The discrete picture of geometry arising from the loop representation of quantum gravity can be extended by a quantum deformation. The operators for area and volume defined in the…
Quantum deformation of quantum gravity
Seth Major, Lee Smolin
We describe a deformation of the observable algebra of quantum gravity in which the loop algebra is extended to framed loops. This allows an alternative nonperturbative quantizatio…
An account of transforms on \bar {{\cal A}/{\cal G}}
Thomas Thiemann
In this article we summarize and describe the recently found transforms for theories of connections modulo gauge transformations associated with compact gauge groups. Specifically,…
Exact solutions for null fluid collapse
Viqar Husain
Exact non-static spherically symmetric solutions of the Einstein equations for a null fluid source with pressure and density related by are given. The metr…
Minisuperspace Examples of Quantization Using Canonical Variables of the Ashtekar Type: Structure and Solutions
J. Fernando Barbero, Michael P. Ryan
The Ashtekar variables have been use to find a number of exact solutions in quantum gravity and quantum cosmology. We investigate the origin of these solutions in the context of a…
Second order perturbations of a Schwarzschild black hole
Reinaldo Gleiser, Oscar Nicasio, Richard Price +1
We study the even-parity perturbations of a Schwarzschild black hole to second order. The Einstein equations can be reduced to a single linear wave equation with a potenti…
Quantization of Nonstandard Hamiltonian Systems
Alejandro Corichi, Michael P. Ryan
The quantization of classical theories that admit more than one Hamiltonian description is considered. This is done from a geometrical viewpoint, both at the quantization level (ge…
Colliding black holes with linearized gravity
J. Pullin
We give a brief summary of results and ongoing research in the application of linearized theory to the study of black hole collisions in the limit in which the holes start close to…
Homogeneous 2+1 Dimensional Gravity in the Ashtekar Formulation
J. Fernando Barbero, Madhavan Varadarajan
The constraint hypersurfaces defining the Witten and Ashtekar formulations for 2+1 gravity are very different. In particular the constraint hypersurface in the Ashtekar case is not…
Head-on collision of two black holes: comparison of different approaches
Peter Anninos, Richard H. Price, Jorge Pullin +2
A benchmark problem for numerical relativity has been the head-on collision of two black holes starting from the ``Misner initial data,'' a closed form momentarily stationary solut…
Cosmology as a Problem in Critical Phenomena
Lee Smolin
Several problems in cosmology and astrophysics are described in which critical phenomena of various types may play a role. These include the organization of the disks of spiral gal…
Spin Networks and Quantum Gravity
Carlo Rovelli, Lee Smolin
We introduce a new basis on the state space of non-perturbative quantum gravity. The states of this basis are linearly independent, are well defined in both the loop representation…
Linking Topological Quantum Field Theory and Nonperturbative Quantum Gravity
Lee Smolin
Quantum gravity is studied nonperturbatively in the case in which space has a boundary with finite area. A natural set of boundary conditions is studied in the Euclidean signature…
A Modular Invariant Quantum Theory From the Connection Formulation of (2+1)-Gravity on the Torus
Peter Peldan
By choosing an unconventional polarization of the connection phase space in (2+1)-gravity on the torus, a modular invariant quantum theory is constructed. Unitary equivalence to th…
Non-covariance of the generalized holonomies: Examples
Troy A. Schilling
A key aspect of a recent proposal for a {\em generalized loop representation} of quantum Yang-Mills theory and gravity is considered. Such a representation of the quantum theory ha…
Self-dual variables, positive semi-definite action, and discrete transformations in four-dimensional quantum gravity
Chopin Soo
A positive semi-definite Euclidean action for arbitrary four-topologies can be constructed by adding appropriate Yang-Mills and topological terms to the Samuel-Jacobson-Smolin acti…
Quantization of diffeomorphism invariant theories of connections with local degrees of freedom
Abhay Ashtekar, Jerzy Lewandowski, Donald Marolf +2
Quantization of diffeomorphism invariant theories of connections is studied. A solutions of the diffeomorphism constraints is found. The space of solutions is equipped with an inne…
The space of states of quantum gravity in terms of loops and extended loops: some remarks
Cayetano Di Bartolo, Rodolfo Gambini, Jorge Griego +1
This article reviews the status of several solutions to all the constraints of quantum gravity that have been proposed in terms of loops and extended loops. We discuss pitfalls of…
Large Diffeomorphisms in (2+1)-Quantum Gravity on the Torus
Peter Peldan
The issue of how to deal with the modular transformations -- large diffeomorphisms -- in (2+1)-quantum gravity on the torus is discussed. I study the Chern-Simons/connection repres…