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Freidel will be giving a talk in the online seminar ILQGS, about Relative Locality---the subject of this paper:

http://arxiv.org/abs/1101.0931

Giovanni Amelino-Camelia, Laurent Freidel, Jerzy Kowalski-Glikman, Lee Smolin

12 pages, 3 figures

(Submitted on 5 Jan 2011)

"We propose a deepening of the relativity principle according to which the invariant arena for non-quantum physics is a phase space rather than spacetime. Descriptions of particles propagating and interacting in spacetimes are constructed by observers, but different observers, separated from each other by translations, construct different spacetime projections from the invariant phase space. Nonetheless, all observers agree that interactions are local in the spacetime coordinates constructed by observers local to them.

This framework, in which absolute locality is replaced by relative locality, results from deforming momentum space, just as the passage from absolute to relative simultaneity results from deforming the linear addition of velocities. Different aspects of momentum space geometry, such as its curvature, torsion and non-metricity, are reflected in different kinds of deformations of the energy-momentum conservation laws. These are in principle all measurable by appropriate experiments. We also discuss a natural set of physical hypotheses which singles out the cases of momentum space with a metric compatible connection and constant curvature."

The audio and slides of the ILQGS talks are made available online, there is often some lively discussion involving people at Marseille, PennState, Perimeter, Nottingham, Potsdam, Warsaw... When this happens it seems to provide additional information (about how the ideas are being received) beyond what one gets by reading the article.

I am curious to know how this proposed Relative Locality principle will be received.

Here is the ILQGS website:

http://relativity.phys.lsu.edu/ilqgs/

This lists the seminars which have been given on LQG topics over the past several years, giving links to audio and slides. As you listen to the audio, the speaker will say which slide number, and when to advance to next slide.

Freidel's is the fourth talk in this spring's series, scheduled for 1 March.

Jan 18 Inflationary observables and observational constraints in LQC Gianluca Calcagni Albert Einstein Institute

Feb 1st Spinfoam cosmology Francesca Vidotto Marseille

Feb 15th Semiclassicality of the loop quantum universe Tomasz Pawlowski University of New Brunswick

Mar 1st

Mar 15th Quantum deformation of 4d spin foam models Winston Fairbairn Hamburg University

...

...

http://arxiv.org/abs/1101.0931

**The principle of relative locality**Giovanni Amelino-Camelia, Laurent Freidel, Jerzy Kowalski-Glikman, Lee Smolin

12 pages, 3 figures

(Submitted on 5 Jan 2011)

"We propose a deepening of the relativity principle according to which the invariant arena for non-quantum physics is a phase space rather than spacetime. Descriptions of particles propagating and interacting in spacetimes are constructed by observers, but different observers, separated from each other by translations, construct different spacetime projections from the invariant phase space. Nonetheless, all observers agree that interactions are local in the spacetime coordinates constructed by observers local to them.

This framework, in which absolute locality is replaced by relative locality, results from deforming momentum space, just as the passage from absolute to relative simultaneity results from deforming the linear addition of velocities. Different aspects of momentum space geometry, such as its curvature, torsion and non-metricity, are reflected in different kinds of deformations of the energy-momentum conservation laws. These are in principle all measurable by appropriate experiments. We also discuss a natural set of physical hypotheses which singles out the cases of momentum space with a metric compatible connection and constant curvature."

The audio and slides of the ILQGS talks are made available online, there is often some lively discussion involving people at Marseille, PennState, Perimeter, Nottingham, Potsdam, Warsaw... When this happens it seems to provide additional information (about how the ideas are being received) beyond what one gets by reading the article.

I am curious to know how this proposed Relative Locality principle will be received.

Here is the ILQGS website:

http://relativity.phys.lsu.edu/ilqgs/

This lists the seminars which have been given on LQG topics over the past several years, giving links to audio and slides. As you listen to the audio, the speaker will say which slide number, and when to advance to next slide.

Freidel's is the fourth talk in this spring's series, scheduled for 1 March.

Jan 18 Inflationary observables and observational constraints in LQC Gianluca Calcagni Albert Einstein Institute

Feb 1st Spinfoam cosmology Francesca Vidotto Marseille

Feb 15th Semiclassicality of the loop quantum universe Tomasz Pawlowski University of New Brunswick

Mar 1st

**The principle of relative locality**Laurent Freidel Perimeter InstituteMar 15th Quantum deformation of 4d spin foam models Winston Fairbairn Hamburg University

...

...

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