Results 61 to 70 of about 178,240 (316)
2D gravitational Mabuchi action on Riemann surfaces with boundaries
Journal of High Energy Physics, 2017 We study the gravitational action induced by coupling two-dimensional non-conformal, massive matter to gravity on a Riemann surface with boundaries. A small-mass expansion gives back the Liouville action in the massless limit, while the first-order mass ...
Adel Bilal, Corinne de Lacroix
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RENORMALIZATION FOR SPIN FOAM MODELS OF QUANTUM GRAVITY [PDF]
The Tenth Marcel Grossmann Meeting, 2006 5 pages, talk given at the 10th Marcel Grossmann meeting, Rio de Janeiro, July ...
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ON INHOMOGENEITY OF A STRING BIT MODEL FOR QUANTUM GRAVITY [PDF]
International Journal of Modern Physics D, 2005 We study quantum gravitational effect on a two-dimensional open universe with one particle by means of a string bit model. We find that matter is necessarily homogeneously distributed if the influence of the particle on the size of the universe is optimized.
Lee, C.-W. H., Mann, R. B.
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Exactly solvable models of 2D dilaton quantum gravity [PDF]
Physics Letters B, 1992 We study canonical quantization of a class of 2d dilaton gravity models, which contains the model proposed by Callan, Giddings, Harvey and Strominger. A set of non-canonical phase space variables is found, forming an $SL(2,{\bf R}) \times U(1)$ current algebra, such that the constraints become quadratic in these new variables.
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Quantum Machian time in toy models of gravity [PDF]
Classical and Quantum Gravity, 2009 27 pages, references added, typos fixed, additional comments added to abs/intro/concl, journal ref ...
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Testing a (Stringy) Model of Quantum Gravity [PDF]
, 2001 I discuss a specific model of space-time foam, inspired by the modern non-perturbative approach to string theory (D-branes). The model views our world as a three brane, intersecting with D-particles that represent stringy quantum gravity effects, which can be real or virtual.
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Renormalization of 3d quantum gravity from matrix models
Physics Letters B, 2004 14 pages, 3 ...
Ambjørn, Jan +2 more
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Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity [PDF]
Journal of Cosmology and Astroparticle PhysicsWe study the primordial spectra and the gravitational-wave background (GWB) of three models of semi-classical, quantum or string gravity where the big bang is replaced by a bounce and the primordial tensor spectrum is blue: ekpyrotic universe with fast ...
I. Ben-Dayan +6 more
semanticscholar +1 more source
Covariance in models of loop quantum gravity: Spherical symmetry [PDF]
, 2015 Spherically symmetric models of loop quantum gravity have been studied recently by different methods that aim to deal with structure functions in the usual constraint algebra of gravitational systems.
M. Bojowald +2 more
semanticscholar +1 more source
Quantum gravity as a group field theory: a sketch
, 2005 We give a very brief introduction to the group field theory approach to quantum gravity, a generalisation of matrix models for 2-dimensional quantum gravity to higher dimension, that has emerged recently from research in spin foam models.Comment: jpconf;
A Perez C Rovelli +13 more
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