scholarly journals MEASUREMENTS AND INFORMATION IN SPIN FOAM MODELS

2012 ◽  
Vol 27 (28) ◽  
pp. 1250164
Author(s):  
J. MANUEL GARCÍA-ISLAS
Keyword(s):  
Information Theory ◽  
Quantum Gravity ◽  
Cosmological Constant ◽  
Shannon Entropy ◽  
Three Dimensional ◽  
Spin Network ◽  
Spin Foam Models ◽  
Foam Model ◽  
Spin Foam Model ◽  
Spin Foam

In the three-dimensional spin foam model of quantum gravity with a cosmological constant, there exists a set of observables associated with spin network graphs. A set of probabilities is calculated from these observables, and hence the associated Shannon entropy can be defined. We present the Shannon entropy associated with these observables and find some interesting bounded inequalities. The problem relates measurements, entropy and information theory in a simple way which we explain.

scholarly journals NEW SPIN FOAM MODELS OF QUANTUM GRAVITY

2005 ◽  
Vol 20 (17n18) ◽  
pp. 1305-1313
Author(s):  
A. MIKOVIĆ
Keyword(s):  
General Relativity ◽  
Models Of Quantum Gravity ◽  
Quantum Gravity ◽  
Path Integral ◽  
Critical Review ◽  
Loop Quantum Gravity ◽  
Spin Networks ◽  
Spin Foam Models ◽  
Spin Foam Model ◽  
Spin Foam

We give a brief and a critical review of the Barret-Crane spin foam models of quantum gravity. Then we describe two new spin foam models which are obtained by direct quantization of General Relativity and do not have some of the drawbacks of the Barret-Crane models. These are the model of spin foam invariants for the embedded spin networks in loop quantum gravity and the spin foam model based on the integration of the tetrads in the path integral for the Palatini action.

scholarly journals Barrett-Crane spin foam model from generalizedBF-type action for gravity

2002 ◽  
Vol 65 (4) ◽  
Author(s):  
Richard E. Livine ◽  
Daniele Oriti
Keyword(s):  
Foam Model ◽  
Spin Foam Model ◽  
Spin Foam

scholarly journals A spin foam model without bubble divergences

2001 ◽  
Vol 599 (1-2) ◽  
pp. 255-282 ◽  
Author(s):  
Alejandro Perez ◽  
Carlo Rovelli
Keyword(s):  
Foam Model ◽  
Spin Foam Model ◽  
Spin Foam

scholarly journals Spin-foam model for gravity coupled to massless scalar field

2019 ◽  
Vol 36 (7) ◽  
pp. 075006 ◽  
Author(s):  
Marcin Kisielowski ◽  
Jerzy Lewandowski
Keyword(s):  
Scalar Field ◽  
Massless Scalar ◽  
Massless Scalar Field ◽  
Foam Model ◽  
Spin Foam Model ◽  
Spin Foam
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