Second quarter 2011 MIP poll-what papers to include?

[marcus]

Second quarter 2011 MIP poll---what papers to include?

At the end of each quarter we have a "most valuable paper" poll among the Loop-and-allied QG papers that have appeared in the last three months. In this case April-June 2011.
Can you suggest some to include on the poll?

We generally start with too big a list and have to narrow down quite a lot to get a manageable poll---something like 15 papers is about all we can conveniently handle. Don't be disappointed if you suggest a good paper (one likely to be important or valuable to future research) and it eventually gets bumped from the list.

Thanks in advance for suggestions!

Here are some I thought of, for starters. Some of them may get dropped from the final poll, we're casting a wide net at first.

http://arxiv.org/abs/1104.5509
http://arxiv.org/cits/1104.5509 3
Effective Hamiltonian Constraint from Group Field Theory
Etera R. Livine, Daniele Oriti, James P. Ryan
14 pages
(Submitted on 28 Apr 2011)

http://arxiv.org/abs/1105.0566
http://arxiv.org/cits/1105.0566
Euclidean three-point function in loop and perturbative gravity
Carlo Rovelli, Mingyi Zhang
16 pages
(Submitted on 3 May 2011)

http://arxiv.org/abs/1105.1898
http://arxiv.org/cits/1105.1898 2
A note on the geometrical interpretation of quantum groups and non-commutative spaces in gravity
Eugenio Bianchi, Carlo Rovelli
(Submitted on 10 May 2011)

http://arxiv.org/abs/1105.2212
http://arxiv.org/cits/1105.2212 2
Cosmological Constant in LQG Vertex Amplitude
Muxin Han
(Submitted on 11 May 2011)

http://arxiv.org/abs/1105.3122
http://arxiv.org/cits/1105.3122 4
Critical behavior of colored tensor models in the large N limit
Valentin Bonzom, Razvan Gurau, Aldo Riello, Vincent Rivasseau

http://arxiv.org/abs/1105.3385
http://arxiv.org/cits/1105.3385
Spinor Representation for Loop Quantum Gravity
Etera R. Livine, Johannes Tambornino
36+1 pages
(Submitted on 17 May 2011)

http://arxiv.org/abs/1105.4637
http://arxiv.org/cits/1105.4637
Spectral Action for Robertson-Walker metrics
Ali H. Chamseddine, Alain Connes
(Submitted on 23 May 2011)

http://arxiv.org/abs/1105.5081
http://arxiv.org/cits/1105.5081
Coherent semiclassical states for loop quantum cosmology
Alejandro Corichi, Edison Montoya
(Submitted on 25 May 2011)

http://arxiv.org/abs/1105.5582
http://arxiv.org/cits/1105.5582
Lattice quantum gravity - an update
J. Ambjorn, J. Jurkiewicz, R. Loll
(Submitted on 27 May 2011)

http://arxiv.org/abs/1105.5646
http://arxiv.org/cits/1105.5646
Spectral dimension as a probe of the ultraviolet continuum regime of causal dynamical triangulations
Thomas P. Sotiriou, Matt Visser, Silke Weinfurtner

http://arxiv.org/abs/1106.0313
http://arxiv.org/cits/1106.0313
Relative locality: A deepening of the relativity principle
Giovanni Amelino-Camelia, Laurent Freidel, Jerzy Kowalski-Glikman, Lee Smolin
(Submitted on 1 Jun 2011)

http://arxiv.org/abs/1106.1103
http://arxiv.org/cits/1106.1103
Towards Loop Quantum Supergravity (LQSG)
Norbert Bodendorfer, Thomas Thiemann, Andreas Thurn
(Submitted on 6 Jun 2011)

http://arxiv.org/abs/1106.1448
http://arxiv.org/cits/1106.1448
Towards Loop Quantization of Plane Gravitational Waves
Franz Hinterleitner, Seth Major
(Submitted on 7 Jun 2011)

http://arxiv.org/abs/1106.3179
http://arxiv.org/cits/1106.3179
The thermodynamic limit and black hole entropy in the area ensemble
J. Fernando Barbero G., Eduardo J. S. Villaseñor
(Submitted on 16 Jun 2011)

 

[atyy]

How about Hellmann's http://arxiv.org/abs/1105.1334?

 

[marcus]

Thanks for the suggestion!

http://arxiv.org/abs/1105.1334
http://arxiv.org/cits/1105.1334
On the Expansions in Spin Foam Cosmology
Frank Hellmann
(Submitted on 6 May 2011)

 

[marcus]

Here's one with a phenomenology angle---relating to possible future observations:

http://arxiv.org/abs/1106.3744
Anomaly-free vector perturbations with holonomy corrections in loop quantum cosmology
Jakub Mielczarek, Thomas Cailleteau, Aurelien Barrau, Julien Grain
(Submitted on 19 Jun 2011)
We investigate vector perturbations with holonomy corrections in the framework of loop quantum cosmology. Conditions to achieve anomaly freedom for these perturbations are found at all orders. This requires the introduction of counter-terms in the hamiltonian constraint. We also show that anomaly freedom requires the diffeomorphism constraint to hold its classical form when matter is added. The gauge-invariant variable and the corresponding equation of motion are derived. The propagation of vector modes through the bounce is finally discussed.
8 pages, 1 figure

 

[marcus]

http://arxiv.org/abs/1106.6016
Holonomy observables in Ponzano-Regge type state sum models
John W. Barrett, Frank Hellmann
(Submitted on 29 Jun 2011)
We study observables on group elements in the Ponzano-Regge model. We show that these observables have a natural interpretation in terms of Feynman diagrams on a sphere and contrast them to the well studied observables on the spin labels. We elucidate this interpretation by showing how they arise from the no-gravity limit of the Turaev-Viro model and Chern-Simons theory.
5 pages, 2 figureshttp://arxiv.org/abs/1106.5473
Coupling of gravity to matter, spectral action and cosmic topology
Branimir Cacic, Matilde Marcolli, Kevin Teh
(Submitted on 27 Jun 2011)
We consider a model of modified gravity based on the spectral action functional, for a cosmic topology given by a spherical space form, and the associated slow-roll inflation scenario. We consider then the coupling of gravity to matter determined by an almost commutative geometry over the spherical space form. We show that this produces a multiplicative shift of the amplitude of the power spectra for the density fluctuations and the gravitational waves, by a multiplicative factor equal to the total number of fermions in the matter sector of the model. We obtain the result by an explicit nonperturbative computation, based on the Poisson summation formula and the spectra of twisted Dirac operators on spherical space forms, as well as by a heat-kernel computation.
28 pages

http://arxiv.org/abs/1106.5095
Invariants of Spin Networks from Braided Ribbon Networks
Jonathan Hackett
(Submitted on 25 Jun 2011)
We connect Braided Ribbon Networks to the states of loop quantum gravity. Using this connection we present the reduced link as an invariant which captures information from the embedding of the spin-networks. We also present a means of understanding higher valent nodes in the context of braided ribbon networks and an interpretation of the dual of these nodes as polygons or polyhedra.
11 pages, 21 figures