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DEVELOPPEMENT MATHEMATIQUE ET APPLICATIONS DE LA GRAVITATION QUANTIQUE A BOUCLES. Thesis (PDF Available) · January. Des chercheurs de l’Institut Périmètre travaillent activement sur un certain nombre d’approches de ce problème, dont la gravitation quantique à boucles, les . 19 avr. A quantum theory of gravitation aims at describing the gravitational La gravité quantique à boucles étant toujours une théorie en cours de.

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Theory of quantum gravity, merging quantum mechanics and general relativity. Mouis, oui, si tu veux ouais. In this thesis, I will present four results, all of which lie in between the two approaches.

TEL – Thèses en ligne – Entanglement and Decoherence in Loop Quantum Gravity

This is known as the relationalist interpretation of space-time. Since loop quantum gravity is still under construction, a pragmatic point of view is advocated and an ansazt for physical states of the gravitational field is studied at first, motivated from condensed matter physics and simple intuitions.

The principle was formulated by Niels Bohr in[24] though he had previously made use of it as early as in developing his model of the atom. Thus, one is forced to work with the original unrescaled, density one-valued, Hamiltonian constraint. Thiemann’s master constraint should not be confused with the master equation which has to do with random processes.

Have you forgotten your login? Furthermore, the existence of such a star would resolve the black hole firewall and black hole information paradox. This together with the quantum versions of the Gauss law and spatial diffeomorphism constrains written in the loop representation are the central equations of LQG modern canonical quantum General relativity. Progress has been made in calculating background independent scattering amplitudes this way with the use of spin foams.


New models have now been put forward, sometimes motivated by imposing the simplicity conditions in a weaker sense. Also, obviously as any quantity Poisson commutes with itself, and the master constraint being a single constraint, it satisfies. Wolfgang Martin Wieland 1 Details. There are however severe difficulties with this particular approach, for example the Hamiltonian operator is not self-adjoint, in fact it is not even a normal operator i. Alexandre Feller 1 AuthorId: With the use of Poisson brackets, the Hamilton’s equations can be rewritten as.

Gravitation quantique a boucles by Podcast Science – Listen to music

Jorge Pullin and Jerzy Lewandowski understood that the intersections of the loops are essential for the consistency of the theory, and the theory should be formulated in terms of intersecting loops, or graphs. Ashtekar’s new quanique was to introduce a new configuration variable. The classical limit or correspondence limit is the ability of a physical theory to approximate or “recover” classical mechanics when considered over special values of its parameters.

For example, string theory also addresses unificationbkucles understanding of all known forces and particles as manifestations of a single entity, by postulating extra dimensions and so-far unobserved additional particles and symmetries.

What is preserved under such transformations are the coincidences between the values the gravitational field take at such and such a “place” and the values the matter fields take there. Part III, chapter 4.

The constraints are certain functions of these phase space variables. Il a, il a, … depuis quelques jours. Probed at a macroscopic scale, it appears as a three-dimensional continuous metric geometry.

Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result.

This defines the loop representation. String theory Loop quantum gravity Causal dynamical triangulation Canonical quantum gravity Superfluid vacuum theory Twistor theory.

Loop Quantum Gravity has nothing to say about the matter gravittation in the universe. When Ashtekar first formulated Hamiltonian general relativity in terms of self-dual complex Ashtekar variables the ADM constraint equations turned into neat polynomials of the elementary fields.


Les plantes dorment la nuit: This opens up a way of trying to directly link canonical LQG to a path integral description. By using this site, you agree to the Terms of Use and Privacy Policy. Grxvitation turns out that a similar trick can be used to treat the second term. The action of the spatial diffeomorphism on the Gauss law is. The master gravitztion see below does not suffer from these problems and as such offers a way of connecting the canonical theory to the path integral formulation.

Lessons for quantum gravity”.

The Chiral Structure of Loop Quantum Gravity

Many of the technical problems in canonical quantum gravitaion revolve around the constraints. Non, enfin moi, non. Retrieved 14 September However, understanding the emergence of our classical spacetime is still an open issue in many proposals. Frame fields in general relativityAshtekar variablesand Self-dual Palatini action.

The vast areas of research developed in several directions that involve about 30 research groups worldwide.

Wolfgang Martin Wieland 1 AuthorId: Typiquement, est ce que le boson existe? There are still problems in properly defining all these equations and solving them. The expressions for the constraints in Ashtekar variables; the Gauss’s law, the spatial diffeomorphism constraint and the densitized Hamiltonian constraint then read:.

The Gauss law is solved by the use of spin network states. Modern Physics 5th ed.