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http://arxiv.org/abs/1307.5238
Anomaly-free perturbations with inverse-volume and holonomy corrections in Loop Quantum Cosmology
Thomas Cailleteau, Linda Linsefors, Aurelien Barrau
(Submitted on 19 Jul 2013)
This article addresses the issue of the closure of the algebra of constraints for generic (cosmological) perturbations when taking into account simultaneously the two main corrections of effective loop quantum cosmology, namely the holonomy and the inverse-volume terms. Previous works on either the holonomy or the inverse volume case are reviewed and generalized. In the inverse-volume case, we point out new possibilities. An anomaly-free solution including both corrections is found for perturbations, and the corresponding equations of motion are derived.
19 pages.
==quote from Conclusions, p, 18==
In this work, we tried to sum up all that is currently known on the issue of the closure of the algebra in effective LQC and to address the question of a full resolution taking into account both corrections simultaneously.
==end quote==
The PIRSA plenary talk videos from Loops 2013 are a remarkable information resource! and some especially noteworthy, I believe, were the first two talks of the conference. These concerned application of LQG to cosmology and confrontation with observations---and were given by Ivan Agullo and Aurelien Barrau. Both talks went considerably outside what we usually think of as typical LQC: i.e. the framework established by Ashtekar Pawlowski Singh in 2006.
An important part of Barrau's talk was based on the above July paper. The talk evoked a series of probing questions at the end, by Rovelli, Freidel, Ashtekar, Lewandowski, Dowker, and Unruh, so it is worth watching not only the talk itself but also the Q&A which followed.
http://pirsa.org/13070036/
Some Possible Ways to Observe Consequences of Loop Quantum Gravity
Aurelien Barrau
In this talk, I'll briefly review some possible observational consequences of loop quantum gravity. I will first address the issue of the closure of the algebra of constraints in holonomy-corrected effective loop quantum cosmology for tensor, vector, and scalar modes. I will underline some unexpected features like a possible change of signature. The associated primordial power spectrum and the basics of the related CMB analysis will be presented. The "asymptotic silence" hypothesis will be mentioned as a promising alternative. Then, I'll address the issue of the probability for inflation and the prediction of its duration from a new perspective. Finally, I'll present some prospect about the evaporation of black holes in LQG.
22/07/2013 - 9:55 am
Anomaly-free perturbations with inverse-volume and holonomy corrections in Loop Quantum Cosmology
Thomas Cailleteau, Linda Linsefors, Aurelien Barrau
(Submitted on 19 Jul 2013)
This article addresses the issue of the closure of the algebra of constraints for generic (cosmological) perturbations when taking into account simultaneously the two main corrections of effective loop quantum cosmology, namely the holonomy and the inverse-volume terms. Previous works on either the holonomy or the inverse volume case are reviewed and generalized. In the inverse-volume case, we point out new possibilities. An anomaly-free solution including both corrections is found for perturbations, and the corresponding equations of motion are derived.
19 pages.
==quote from Conclusions, p, 18==
In this work, we tried to sum up all that is currently known on the issue of the closure of the algebra in effective LQC and to address the question of a full resolution taking into account both corrections simultaneously.
==end quote==
The PIRSA plenary talk videos from Loops 2013 are a remarkable information resource! and some especially noteworthy, I believe, were the first two talks of the conference. These concerned application of LQG to cosmology and confrontation with observations---and were given by Ivan Agullo and Aurelien Barrau. Both talks went considerably outside what we usually think of as typical LQC: i.e. the framework established by Ashtekar Pawlowski Singh in 2006.
An important part of Barrau's talk was based on the above July paper. The talk evoked a series of probing questions at the end, by Rovelli, Freidel, Ashtekar, Lewandowski, Dowker, and Unruh, so it is worth watching not only the talk itself but also the Q&A which followed.
http://pirsa.org/13070036/
Some Possible Ways to Observe Consequences of Loop Quantum Gravity
Aurelien Barrau
In this talk, I'll briefly review some possible observational consequences of loop quantum gravity. I will first address the issue of the closure of the algebra of constraints in holonomy-corrected effective loop quantum cosmology for tensor, vector, and scalar modes. I will underline some unexpected features like a possible change of signature. The associated primordial power spectrum and the basics of the related CMB analysis will be presented. The "asymptotic silence" hypothesis will be mentioned as a promising alternative. Then, I'll address the issue of the probability for inflation and the prediction of its duration from a new perspective. Finally, I'll present some prospect about the evaporation of black holes in LQG.
22/07/2013 - 9:55 am
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