Conference

Displaying 2845 - 2856 of 4905

Phenomenology - 4
- Stefano Bianco Sapienza University of Rome
- Giovanni Amelino-Camelia Sapienza Università di Roma - Dipartimento di Fisica
- Angel Ballesteros Universidad de Burgos
- Hans Westman
July 25, 2013

PIRSA:13070077
Canonical Quantum Gravity - 4
- Suzanne Lanery Universidad Nacional Autónoma De Mexico (UNAM)
- Maximilian Hanusch Universität Paderborn
- Yongge Ma Beijing Normal University
July 25, 2013

PIRSA:13070078
Discrete Approaches - 3
- Ghanashyam Date Institute of Mathematical Sciences
- Jacek Puchta University of Warsaw
- Bianca Dittrich Perimeter Institute for Theoretical Physics
- Sumati Surya Raman Research Institute
July 25, 2013

PIRSA:13070079
Canonical Quantum Gravity - 3
- Casey Tomlin Pennsylvania State University
- Saeed Rastgoo Universidad Nacional Autónoma de México (UNAM) - Centro de Ciencias Matematicas
- Javier Olmedo Pennsylvania State University
- Alexander Stottmeister University of Erlangen-Nuremberg
July 25, 2013

PIRSA:13070074
Group Field Theory and Tensor Models - 1
- Matti Raasakka Université Sorbonne Paris Nord (Paris 13)
- Thomas Krajewski Aix-Marseille University
- Daniele Oriti Complutense University of Madrid
- James Ryan Vinted (Germany)
- Valentin Bonzom Gustave Eiffel University
July 25, 2013

PIRSA:13070072
Phenomenology - 3
- Ivette Fuentes University of Southampton
- Stephon Alexander Brown University
- Astrid Eichhorn Universität Heidelberg
- Djordje Minic Virginia Polytechnic Institute and State University
- Antonino Marciano Fudan University
July 25, 2013

PIRSA:13070073
Discrete Approaches - 2
- Aaron Trout Chatham University
- Philipp Hoehn Okinawa Institute of Science and Technology Graduate University
July 25, 2013

PIRSA:13070075
Causal Dynamical Triangulations without Preferred Foliation

Renate Loll Radboud Universiteit Nijmegen

July 25, 2013

PIRSA:13070071
Towards a Consistent Quantum Dynamics for Euclidean LQG: A Weak Coupling Limit

Madhavan Varadarajan Raman Research Institute

July 25, 2013

PIRSA:13070080
Casual Sets and the Quantum Action

Fay Dowker Imperial College London

July 25, 2013

PIRSA:13070069
Asymptotic Dynamics: Spin Foam Partition Functions in an Asymptotic Regime

Frank Hellmann Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)

July 25, 2013

PIRSA:13070068
Spinfoam Formulation of Loop Quantum Gravity

Muxin Han Florida Atlantic University

July 24, 2013

PIRSA:13070067

Phenomenology - 4
- Stefano Bianco Sapienza University of Rome
- Giovanni Amelino-Camelia Sapienza Università di Roma - Dipartimento di Fisica
- Angel Ballesteros Universidad de Burgos
- Hans Westman
July 25, 2013

PIRSA:13070077
Canonical Quantum Gravity - 4
- Suzanne Lanery Universidad Nacional Autónoma De Mexico (UNAM)
- Maximilian Hanusch Universität Paderborn
- Yongge Ma Beijing Normal University
July 25, 2013

PIRSA:13070078
Discrete Approaches - 3
- Ghanashyam Date Institute of Mathematical Sciences
- Jacek Puchta University of Warsaw
- Bianca Dittrich Perimeter Institute for Theoretical Physics
- Sumati Surya Raman Research Institute
July 25, 2013

PIRSA:13070079
Canonical Quantum Gravity - 3
- Casey Tomlin Pennsylvania State University
- Saeed Rastgoo Universidad Nacional Autónoma de México (UNAM) - Centro de Ciencias Matematicas
- Javier Olmedo Pennsylvania State University
- Alexander Stottmeister University of Erlangen-Nuremberg
July 25, 2013

PIRSA:13070074
Group Field Theory and Tensor Models - 1
- Matti Raasakka Université Sorbonne Paris Nord (Paris 13)
- Thomas Krajewski Aix-Marseille University
- Daniele Oriti Complutense University of Madrid
- James Ryan Vinted (Germany)
- Valentin Bonzom Gustave Eiffel University
July 25, 2013

PIRSA:13070072
Phenomenology - 3
- Ivette Fuentes University of Southampton
- Stephon Alexander Brown University
- Astrid Eichhorn Universität Heidelberg
- Djordje Minic Virginia Polytechnic Institute and State University
- Antonino Marciano Fudan University
July 25, 2013

PIRSA:13070073
Discrete Approaches - 2
- Aaron Trout Chatham University
- Philipp Hoehn Okinawa Institute of Science and Technology Graduate University
July 25, 2013

PIRSA:13070075
Causal Dynamical Triangulations without Preferred Foliation

Renate Loll Radboud Universiteit Nijmegen

July 25, 2013

PIRSA:13070071

We introduce a generalized version of the Causal Dynamical Triangulations (CDT) formulation of quantum gravity, in which the regularized, triangulated path integral histories maintain their causal properties, but do not have a preferred proper-time foliation. An extensive numerical study of the associated nonperturbative path integral in 2+1 dimensions shows that it can nevertheless reproduce the emergence of an extended de Sitter universe on large scales, a key feature of CDT quantum gravity. This suggests that the preferred foliation normally used in CDT is not a crucial (although convenient) part of its background structure.
Towards a Consistent Quantum Dynamics for Euclidean LQG: A Weak Coupling Limit

Madhavan Varadarajan Raman Research Institute

July 25, 2013

PIRSA:13070080

Spacetime covariance in canonical quantum gravity is tied to the existence of an anomaly free representation of its constraint algebra. I will argue that establishing the existence of such a representation in the LQG context requires the consideration of higher than unit density weight Hamiltonian constraints. Smolin's weak coupling limit of Euclidean gravity, while simpler than full blown gravity , still exhibits an open constraint algebra isomorphic to that of gravity and offers an ideal testing ground for the investigation of the quantum constraint algebra of such higher density constraints. I will report on recent progress on this issue in the context of an LQG type quantization of this system. Certain features of the constructions such as the encoding of the action of the quantum constraint in terms of operator valued diffeomorphisms may play a key role in the definition of a consistent quantum dynamics for LQG.
Casual Sets and the Quantum Action

Fay Dowker Imperial College London

July 25, 2013

PIRSA:13070069

The struggle between local and global concepts in physics comes to a head in causal set quantum gravity. Local physics -- and general relativity in particular -- must be recovered in a continuum approximation if the theory is to be successful but causal sets are inherently non-local entities. I will describe a family of causal set actions labelled by dimension, each of which is nonlocal and yet, when applied to certain causal sets, approximates the Einstein Hilbert action and is therefore effectively local. I will explain why this is a source of hope that causal set theory has a continuum approximation.
Asymptotic Dynamics: Spin Foam Partition Functions in an Asymptotic Regime

Frank Hellmann Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)

July 25, 2013

PIRSA:13070068

Spin foam models are models for space time built from discrete chunks of quantized geometry. In the asymptotic regime the classical geometry is regained.
In the last year we have seen rapid developments in our understanding of this geometry at the level of the entire partition function. In particular it was found that the geometries that contribute to the partition function in the asymptotic regime satisfy accidental curvature constraints.
I will discuss the classic results and role of asymptotics, the recent results and their impact on the interpretation of these models.
Spinfoam Formulation of Loop Quantum Gravity

Muxin Han Florida Atlantic University

July 24, 2013

PIRSA:13070067

Recently there are a lot of progresses in developing the spinfoam formulation of loop quantum gravity. In this talk I give an overview of the subject. I introduce the formalism and the motivation of the theory, and I discuss the application of spinfoam formulation in black hole and cosmology. I also discuss the inclusion of the quantum matter fields and cosmological constant in the formalism. The inclusion of cosmological constant motivates a Chern-Simons formulation of LQG. Finally I discuss the semiclassical low-energy approximation of the spinfoam formulation, where Einstein gravity appears as the leading contribution.

Title	Speaker(s)	Date	Talk Type	Info link
Phenomenology - 4	Stefano Bianco, Giovanni Amelino-Camelia, Angel Ballesteros, Hans Westman	2013-07-25	Conference	View details
Canonical Quantum Gravity - 4	Suzanne Lanery, Maximilian Hanusch, Yongge Ma	2013-07-25	Conference	View details
Discrete Approaches - 3	Ghanashyam Date, Jacek Puchta, Bianca Dittrich, Sumati Surya	2013-07-25	Conference	View details
Canonical Quantum Gravity - 3	Casey Tomlin, Saeed Rastgoo, Javier Olmedo, Alexander Stottmeister	2013-07-25	Conference	View details
Group Field Theory and Tensor Models - 1	Matti Raasakka, Thomas Krajewski, Daniele Oriti, James Ryan, Valentin Bonzom	2013-07-25	Conference	View details
Phenomenology - 3	Ivette Fuentes, Stephon Alexander, Astrid Eichhorn, Djordje Minic, Antonino Marciano	2013-07-25	Conference	View details
Discrete Approaches - 2	Aaron Trout, Philipp Hoehn	2013-07-25	Conference	View details
Causal Dynamical Triangulations without Preferred Foliation	Renate Loll	2013-07-25	Conference	View details
Towards a Consistent Quantum Dynamics for Euclidean LQG: A Weak Coupling Limit	Madhavan Varadarajan	2013-07-25	Conference	View details
Casual Sets and the Quantum Action	Fay Dowker	2013-07-25	Conference	View details
Asymptotic Dynamics: Spin Foam Partition Functions in an Asymptotic Regime	Frank Hellmann	2013-07-25	Conference	View details
Spinfoam Formulation of Loop Quantum Gravity	Muxin Han	2013-07-24	Conference	View details

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Format results

Phenomenology - 4

Canonical Quantum Gravity - 4

Discrete Approaches - 3

Canonical Quantum Gravity - 3

Group Field Theory and Tensor Models - 1

Phenomenology - 3

Discrete Approaches - 2

Causal Dynamical Triangulations without Preferred Foliation

Towards a Consistent Quantum Dynamics for Euclidean LQG: A Weak Coupling Limit

Casual Sets and the Quantum Action

Asymptotic Dynamics: Spin Foam Partition Functions in an Asymptotic Regime

Spinfoam Formulation of Loop Quantum Gravity

Phenomenology - 4

Canonical Quantum Gravity - 4

Discrete Approaches - 3

Canonical Quantum Gravity - 3

Group Field Theory and Tensor Models - 1

Phenomenology - 3

Discrete Approaches - 2

Causal Dynamical Triangulations without Preferred Foliation

Towards a Consistent Quantum Dynamics for Euclidean LQG: A Weak Coupling Limit

Casual Sets and the Quantum Action

Asymptotic Dynamics: Spin Foam Partition Functions in an Asymptotic Regime

Spinfoam Formulation of Loop Quantum Gravity