Plenary Session 3

(last updated: February, 7th 2014)

Contact: Roland Triay (CPT) – triay[at]cpt.univ-mrs.fr

Schedule

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The rooms mentionned in the program are located on this map of the campus (pdf file). This map will be distributed at the beginning of the Symposium.

DayJuly, 14Before the symposium…
Event19h00, Welcome Party: French National Day, fireworks…No conference associated
DayJuly, 15First day of the symposium…
Break08h00 – 08h45Conference Registration, Room “Salle de Conférences”
Parallel Sessions08h45 – 10h30Plenary session
Break10h30 – 11h00Coffee break
Parallel Sessions11h00 – 12h30Morning parallel plenary sessions
PlaceAmphi “Charve”Gravitation and the QuantumPlenary Session 3
Chairman: Jerzy Lewandowski
Talk11h00 – 11h45July, 15
speaker-5360e3ab7f0b5 Walter Greiner (FIAS) There are no black holes: Pseudo-Complex General Relativity From Einstein to Zweistein
abstract

General Relativity - in particular if applied to the central mass problem – contains a singularity: The Schwarzschild singularity, which leads to the prediction of black holes.

Our new concept is: No theory should contain singularities. This will also be applied to quantum electrodynamics: In General Relativity it leads us to Pseudo-Complex General Relativity. Black holes disappear and a new “Weltbild” for the cosmos emerges.

Talk11h45 – 12h30July, 15
speaker-5353d3b80c4f9 Eugenio Bianchi (Penn State) Last gasps of a black hole
abstract

After 40 years of active research the question of the fate of information that falls into a black hole is still open [1]. In this talk I will discuss recent results [2] that allow us to compute the entanglement entropy production in black hole evaporation. In particular I present a study of the information release in a model that takes into account the loop quantum gravity resolution of the black hole singularity [3]. The analysis of this phenomenon provides new insights into the entanglement structure of space-time during and after the complete evaporation of the black hole.

References

[1] S.W. Hawking, Breakdown of predictability in gravitational collapse, Phys. Rev. D 14 (1976) ~10, 2460.

[2] E. Bianchi and M. Smerlak, Entanglement entropy and negative-energy fluxes in two-dimensional spacetimes, (2014), arXiv:1404.0602

[3] C. Rovelli and F. Vidotto, Planck stars, (2014), arXiv:1401.6562

Break12h30 – 14h30Lunch
Parallel Sessions14h30 – 16h30First afternoon parallel sessions
Break16h30 – 17h00Coffee break
Parallel Sessions17h00 – 18h30Second afternoon parallel sessions
Event19h00, Public Lecture, Jean-Pierre Luminet : Les bâtisseurs du ciel, de Copernic à demainNo conference associated
DayJuly, 16Second day of the symposium…
Parallel Sessions09h00 – 10h30Plenary session
Break10h30 – 11h00Coffee break
Parallel Sessions11h00 – 12h30Morning parallel plenary sessions
PlaceAmphi “Massiani”Gravitation and the QuantumPlenary Session 3
Chairman: Eugenio Bianchi
Talk11h00 – 11h45July, 16
speaker-533d8d7f46430 Jorge Pullin (LSU) Hawking radiation in loop quantum gravity
abstract

We exploit the recently found exact solution of the quantum constraints of loop quantum gravity in vacuum with spherical symmetry to analyze a quantum field theory living on the quantum space time. The main effect of the quantum background is to lead to field equations that are discrete for the quantum field theory. The Hartle-Hawking, Unruh and Boulware vacua are all recovered with small modifications, but the discrete structure eliminates all infinities asssociated with physical quantities computed on the vacuum. We also briefly address the issue of Lorentz invariance and the emergence of limitations on the matter content of the theory.

References

[1] R. Gambini, J. Pullin, arXiv: 1312:3595, to appear in CQG.

Talk11h45 – 12h30July, 16
speaker-534145b0e63ed Burra Sidharth (BMBSC) A Test Bed for High Energy Physiscs
abstract

We briefly comment upon the parallel between graphene and high energy fermions and explore the possibility of using the former as a test bed for the latter rather like Reynold's numbers in a wind tunnel. We also point out that there are parallels to Quantum Gravity approaches, which indeed provide a novel explanation for such effects as the FQAE.

Break12h30 – 14h30Lunch
Parallel Sessions14h30 – 16h30First afternoon parallel sessions
Break16h30 – 17h00Coffee break
Parallel Sessions17h00 – 18h30Second afternoon parallel sessions
EventBanquet at Palais du Pharo — 19h00No conference associated
DayJuly, 17Third day of the symposium…
Parallel Sessions09h00 – 10h30Plenary session
Break10h30 – 11h00Coffee break
Parallel Sessions11h00 – 12h30Morning parallel plenary sessions
PlaceAmphi “Sciences Naturelles”(broadcast)Plenary Session 3
Chairman: Carlo Rovelli
Talk11h00 – 11h45July, 17
speaker-53849949341e9 Jerzy Lewandowski (UW) Background independence of GR and in LQG
abstract

The physical meaning of the diffeomorphisms in the general relativistic theories will be discussed, the issues of time evolution in terms of the Dirac observables and physical Hamiltonian will be addressed. New proposals for geometric deparametrization will be presented. The quantum part of the lecture will concern the canonical LQG. New, improved formulations of the quantum Hamiltonian will be proposed. New applications for LQG will be offered. Original results that will be presented in this lecture were obtained in collaboration with: Dapor, Duch, Kaminski, Swiezewski, Alesci, Assanioussi, Dziendzikowski and Sahlmann.

Talk11h45 – 12h30July, 17
speaker-539ce55d6cd23 Bernard Whiting (UF) High precision gravitational self-force calculations and post-Newtonian implications
abstract

This talk is based on [1,2,3]. Until less than 10 years ago, post-Newtonian (pN) analysis was the only possible systematic method for obtaining gravitational waveforms corresponding to binary inspiral. However, these were cut-off before the merger, until the recent availability of direct results from numerical relativity computations, which could include the complete merger and ring-down phase of the orbital evolution. Unfortunately these calculations are not yet of sufficient precision to strenuously test pN methods intrinsically. By contrast, the gravitational self-force approach has become capable of advancing to extremely high precision, and of thereby testing most of the various techniques used in pN calculations. Although restricted to the extreme-mass-ratio limit, self-force calculations are now able to verify both the methods and results of pN work, and even of extending it. In fact, as will be demonstrated, they now have high enough precision to be able to determine new coefficients analytically.

References

[1] Abhay G Shah, John L Friedman and Bernard F Whiting, Finding high-order analytic post-Newtonian parameters from a high-precision numerical self-force calculation, 7pp, published in Phys.Rev. D 89 064042 (March 18, 2014), arXiv:1312.1952 [gr-qc]

[2] Luc Blanchet, Guillaume Faye and Bernard F. Whiting, Half-integral conservative post-Newtonian approximations in the redshift factor of black hole binaries, 12 pp, published in Phys.Rev. D 89 064026 (March 11, 2014), arXiv:1312.2975 [gr-qc]

[3] Luc Blanchet, Guillaume Faye and Bernard F. Whiting, High-order half-integral conservative post-Newtonian coefficients in the redshift factor of black hole binaries, 33 pp, submitted to Phys.Rev. D (May 20, 2014), arXiv:1405.5151 [gr-qc].

Break12h30 – 14h30Lunch
Parallel Sessions14h30 – 16h30First afternoon parallel sessions
Break16h30 – 17h00Coffee break
Parallel Sessions17h00 – 18h30Second afternoon parallel sessions
EventCocktail at the City Hall — 19h00No conference associated
DayJuly, 18Fourth day of the symposium…
Parallel Sessions09h00 – 10h30Plenary session
Break10h30 – 11h00Coffee break
Parallel Sessions11h00 – 12h30Morning parallel plenary sessions
Break12h30 – 14h30Lunch
Parallel Sessions14h30 – 16h30First afternoon parallel sessions
Break16h30 – 17h00Coffee break
Parallel Sessions17h00 – 18h30Second afternoon parallel sessions