Format results
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Noncommutative Geometry à la Connes
Christoph Stephan - University of Potsdam
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Particle detector models, entropy and localization in semiclassical gravity
Federico Piazza - Aix-Marseille University
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Undergraduate Summer Research Project Presentations
Alexandru Dafinca - University of Oxford , Francesca Vidotto - Western University , Robert Mooney , Timothy Hsieh - Perimeter Institute for Theoretical Physics
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Numerical Studies of Graphity Models
Tomasz Konopka - City University of Hong Kong
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On Spectral Triples in Quantum Gravity
Jesper Grimstrup - University of Copenhagen
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Affine Quantum Gravity: A Different View of a Difficult Problem
John Klauder - University of Florida
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Observables in perturbative de Sitter gravity
Donald Marolf - University of California, Santa Barbara
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Renormalization in Noncommutative Quantum Field Theory
Razvan Gurau - Universität Heidelberg
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Emergent Time in Barbour and Bertotti\'s Timeless Mechanics
Sean Gryb - University of Groningen
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Quantum Spacetime
Sergio Doplicher - Sapienza University of Rome
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Noncommutative Geometry à la Connes
Christoph Stephan - University of Potsdam
During the last two decades Alain Connes developed Noncommutative Geometry, which allows to unify two of the basic theories of modern physics: General Relativity and the Standard Model of Particle Physics. In the noncommutative framework the Higgs boson, which had previously to be put in by hand… -
Particle detector models, entropy and localization in semiclassical gravity
Federico Piazza - Aix-Marseille University
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Undergraduate Summer Research Project Presentations
Alexandru Dafinca - University of Oxford , Francesca Vidotto - Western University , Robert Mooney , Timothy Hsieh - Perimeter Institute for Theoretical Physics
TBA -
Towards a generally covariant averaging process for metrics in general relativity
Juliane Behrend - Universität Ulm
The speculation that Dark Energy can be explained by the backreaction of present inhomogeneities on the evolution of the background cosmology has been increasingly debated in the recent literature. We demonstrate quantitively that the backreaction of linear perturbations on the Friedmann equations… -
Numerical Studies of Graphity Models
Tomasz Konopka - City University of Hong Kong
Graphity models are characterized by configuration spaces in which states correspond to graphs and Hamiltonians that depend on local properties of graphs such as degrees of vertices and numbers of shortcycles. It has been argued that such models can be useful in studying how an extended geometry… -
On Spectral Triples in Quantum Gravity
Jesper Grimstrup - University of Copenhagen
This talk is concerned with the existence of spectral triples in quantum gravity. I will review the construction of a spectral triple over a functional space of connections. Here, the *-algebra is generated by holonomy loops and the Dirac type operator has the form of a global functional derivation… -
Affine Quantum Gravity: A Different View of a Difficult Problem
John Klauder - University of Florida
For quantum gravity, the requirement of metric positivity suggests the use of noncanonical, affine kinematical field operators. In view of gravity\'s set of open classical first class constraints, quantization before reduction is appropriate, leading to affine commutation relations and affine… -
Observables in perturbative de Sitter gravity
Donald Marolf - University of California, Santa Barbara
TBA -
Renormalization in Noncommutative Quantum Field Theory
Razvan Gurau - Universität Heidelberg
This talk presents some recent results in renormalizable noncommutative quantum field theory. After introducing the renormalization group approach in the commutative setting I will procede to its generalization to the simplest noncommutative model, $phi_4^{star 4}$ on the Moyal space. The well known… -
Trans-Planckian physics and renormalization
We analyze the trans-Planckian problem and its formulation in the context of cosmology, black-hole physics, and analogue models of gravity. In particular, we discuss the phenomenological approach to the trans-Planckian problem based on modified, locally Lorentz-breaking, dispersion relations (MDR)… -
Emergent Time in Barbour and Bertotti\'s Timeless Mechanics
Sean Gryb - University of Groningen
The problem of time is studied in a toy model for quantum gravity: Barbour and Bertotti\'s timeless formulation of non-relativistic mechanics. We quantize this timeless theory using path integrals and compare it to the path integral quantization of parameterized Newtonian mechanics, which contains… -
Quantum Spacetime
Sergio Doplicher - Sapienza University of Rome
The principles of Quantum Mechanics and of Classical General Relativity imply Uncertainty Relations between the different spacetime coordinates of the events, which yield to a basic model of Quantum Minkowski Space, having the full (classical) Poincare\' group as group of symmetries. The four…