Search results

article

The universe as a quantum gravity condensate

Daniele Oriti

Comptes Rendus Physique > 2017 > 18 > 3-4 > 235-245

This is an introduction to the approach to the extraction of cosmological dynamics from full quantum gravity based on group field theory condensates. We outline its general perspective, which sees cosmology as the hydrodynamics of the fundamental quantum gravity degrees of freedom, as well as its concrete implementation within the group field theory formalism. We summarize recent work showing the...

article

Accelerated expansion of the Universe without an inflaton and resolution of the initial singularity from Group Field Theory condensates

Marco de Cesare, Mairi Sakellariadou

Physics Letters B > 2017 > 764 > C > 49-53

We study the expansion of the Universe using an effective Friedmann equation obtained from the dynamics of GFT (Group Field Theory) isotropic condensates. The evolution equations are classical, with quantum correction terms to the Friedmann equation given in the form of effective fluids coupled to the emergent classical background. The occurrence of a bounce, which resolves the initial spacetime singularity,...

article

Super-Group Field Cosmology in Batalin-Vilkovisky Formulation

Sudhaker Upadhyay

International Journal of Theoretical Physics > 2016 > 55 > 9 > 4005-4015

In this paper we study the third quantized super-group field cosmology, a model in multiverse scenario, in Batalin-Vilkovisky (BV) formulation. Further, we propose the superfield/super-antifield dependent BRST symmetry transformations. Within this formulation we establish connection between the two different solutions of the quantum master equation within the BV formulation.

article

Melonic Phase Transition in Group Field Theory

Aristide Baratin, Sylvain Carrozza, Daniele Oriti, James Ryan, more

Letters in Mathematical Physics > 2014 > 104 > 8 > 1003-1017

Group field theories have recently been shown to admit a 1/N expansion dominated by so-called ‘melonic graphs’, dual to triangulated spheres. In this note, we deepen the analysis of this melonic sector. We obtain a combinatorial formula for the melonic amplitudes in terms of a graph polynomial related to a higher-dimensional generalization of the Kirchhoff tree-matrix theorem. Simple bounds on these...

article

Wilson loops, geometric operators and fermions in 3d group field theory

R. Dowdall

Open Physics > 2011 > 9 > 4 > 1043-1056

Group field theories whose Feynman diagrams describe 3d gravity with a varying configuration of Wilson loop observables and 3d gravity with volume observables at each vertex are defined. The volume observables are created by the usual spin network grasping operators which require the introduction of vector fields on the group. We then use this to define group field theories that give a previously...

article

Wilson loops, geometric operators and fermions in 3d group field theory

R. Dowdall

Open Physics > 2011 > 9 > 4 > 1043-1056

Group field theories whose Feynman diagrams describe 3d gravity with a varying configuration of Wilson loop observables and 3d gravity with volume observables at each vertex are defined. The volume observables are created by the usual spin network grasping operators which require the introduction of vector fields on the group. We then use this to define group field theories that give a previously...

article

Wilson loops, geometric operators and fermions in 3d group field theory

R. J. Dowdall

Central European Journal of Physics > 2011 > 9 > 4 > 1043-1056

Group field theories whose Feynman diagrams describe 3d gravity with a varying configuration of Wilson loop observables and 3d gravity with volume observables at each vertex are defined. The volume observables are created by the usual spin network grasping operators which require the introduction of vector fields on the group. We then use this to define group field theories that give a previously...

article

Radiative Corrections in the Boulatov-Ooguri Tensor Model: The 2-Point Function

Joseph Ben Geloun, Valentin Bonzom

International Journal of Theoretical Physics > 2011 > 50 > 9 > 2819-2841

The Boulatov-Ooguri tensor model generates a sum over spacetime topologies for the D-dimensional BF theory. We study here the quantum corrections to the propagator of the theory. In particular, we find that the radiative corrections at the second order in the coupling constant yield a mass renormalization. They also exhibit a divergence which cannot be balanced with a counter-term in the initial action,...

INFONA - science communication portal

Search results

The universe as a quantum gravity condensate

Accelerated expansion of the Universe without an inflaton and resolution of the initial singularity from Group Field Theory condensates

Super-Group Field Cosmology in Batalin-Vilkovisky Formulation

Melonic Phase Transition in Group Field Theory

Wilson loops, geometric operators and fermions in 3d group field theory

Wilson loops, geometric operators and fermions in 3d group field theory

Wilson loops, geometric operators and fermions in 3d group field theory

Radiative Corrections in the Boulatov-Ooguri Tensor Model: The 2-Point Function

Filter options

Publication date

Keywords

Data set

INFONA - science communication portal

Search results

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Keywords

Data set

Reporting an error / abuse

Sending the report failed

Accessibility options