329 research outputs found
Encoding simplicial quantum geometry in group field theories
We show that a new symmetry requirement on the GFT field, in the context of
an extended GFT formalism, involving both Lie algebra and group elements,
leads, in 3d, to Feynman amplitudes with a simplicial path integral form based
on the Regge action, to a proper relation between the discrete connection and
the triad vectors appearing in it, and to a much more satisfactory and
transparent encoding of simplicial geometry already at the level of the GFT
action.Comment: 15 pages, 2 figures, RevTeX, references adde
A quantum field theory of simplicial geometry and the emergence of spacetime
We present the case for a fundamentally discrete quantum spacetime and for
Group Field Theories as a candidate consistent description of it, briefly
reviewing the key properties of the GFT formalism. We then argue that the
outstanding problem of the emergence of a continuum spacetime and of General
Relativity from fundamentally discrete quantum structures should be tackled
from a condensed matter perspective and using purely QFT methods, adapted to
the GFT context. We outline the picture of continuum spacetime as a condensed
phase of a GFT and a research programme aimed at realizing this picture in
concrete terms.Comment: 10 pages, no figures; to appear in the Proceedings of the DICE 2006
Workshop (Piombino, Italy), uses IOP Conf style; v2: typos corrected, added
preprint number
Group field theory with non-commutative metric variables
We introduce a dual formulation of group field theories, making them a type
of non-commutative field theories. In this formulation, the variables of the
field are Lie algebra variables with a clear interpretation in terms of
simplicial geometry. For Ooguri-type models, the Feynman amplitudes are
simplicial path integrals for BF theories. This formulation suggests ways to
impose the simplicity constraints involved in BF formulations of 4d gravity
directly at the level of the group field theory action. We illustrate this by
giving a new GFT definition of the Barrett-Crane model.Comment: 4 pages; v3 published versio
Quantum gravity as a group field theory: a sketch
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; 8 pages, 9 figures; to appear in the Proceedings of the
Fourth Meeting on Constrained Dynamics and Quantum Gravity, Cala Gonone,
Italy, September 12-16, 200
The Bronstein hypercube of quantum gravity
We argue for enlarging the traditional view of quantum gravity, based on "quantizing GR", to include explicitly the non-spatiotemporal nature of the fundamental building blocks suggested by several modern quantum gravity approaches (and some semi-classical arguments), and to focus more on the issue of the emergence of continuum spacetime and geometry from their collective dynamics. We also discuss some recent developments in quantum gravity research, aiming at realising these ideas, in the context of group field theory, random tensor models, simplicial quantum gravity, loop quantum gravity, spin foam models
Bounding bubbles: the vertex representation of 3d Group Field Theory and the suppression of pseudo-manifolds
Based on recent work on simplicial diffeomorphisms in colored group field
theories, we develop a representation of the colored Boulatov model, in which
the GFT fields depend on variables associated to vertices of the associated
simplicial complex, as opposed to edges. On top of simplifying the action of
diffeomorphisms, the main advantage of this representation is that the GFT
Feynman graphs have a different stranded structure, which allows a direct
identification of subgraphs associated to bubbles, and their evaluation is
simplified drastically. As a first important application of this formulation,
we derive new scaling bounds for the regularized amplitudes, organized in terms
of the genera of the bubbles, and show how the pseudo-manifolds configurations
appearing in the perturbative expansion are suppressed as compared to
manifolds. Moreover, these bounds are proved to be optimal.Comment: 28 pages, 17 figures. Few typos fixed. Minor corrections in figure 6
and theorem
Emergent non-commutative matter fields from Group Field Theory models of quantum spacetime
We offer a perspective on some recent results obtained in the context of the
group field theory approach to quantum gravity, on top of reviewing them
briefly. These concern a natural mechanism for the emergence of non-commutative
field theories for matter directly from the GFT action, in both 3 and 4
dimensions and in both Riemannian and Lorentzian signatures. As such they
represent an important step, we argue, in bridging the gap between a quantum,
discrete picture of a pre-geometric spacetime and the effective continuum
geometric physics of gravity and matter, using ideas and tools from field
theory and condensed matter analog gravity models, applied directly at the GFT
level.Comment: 13 pages, no figures; uses JPConf style; contribution to the
proceedings of the D.I.C.E. 2008 worksho
The universe as a quantum gravity condensate
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 summarise recent work showing the emergence of a bouncing cosmological dynamics from a fundamental group field theory model, and provide a brief but complete survey of other results in the literature. Finally, we discuss open issues and directions for further research
Recent Progress in Group Field Theory
We introduce the key ideas behind the group field theory approach to quantum gravity, and the basic elements of its formalism. We also briefly report on some recent results obtained in this approach, concerning both the mathematical definition of these models, and possible avenues towards extracting interesting physics from them
Matter in Toy Dynamical Geometries
One of the objectives of theories describing quantum dynamical geometry is to
compute expectation values of geometrical observables. The results of such
computations can be affected by whether or not matter is taken into account. It
is thus important to understand to what extent and to what effect matter can
affect dynamical geometries. Using a simple model, it is shown that matter can
effectively mold a geometry into an isotropic configuration. Implications for
"atomistic" models of quantum geometry are briefly discussed.Comment: 8 pages, 1 figure, paper presented at DICE 200
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