GRAVITATION QUANTIQUE BOUCLES PDF

Arashizil General Relativity and Gravitation. We analyze the proposal of reconstructing geometry from correlations. It will be interesting to compare these results to the corresponding super string calculations. This dramatic simplification seemed to open up the way grwvitation quantizing the constraints.

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Mazur We now move on to demonstrate an important aspect of the quantum constraints. These reality conditions match the linear simplicity constraints of spinfoam gravity. We consider the action of the constraints on arbitrary phase space functions. Loop quantum cosmologyBig bounceand inflation cosmology. LQG offers a geometric explanation of the finiteness of the entropy gravitaiton of the proportionality of the area of the horizon.

A detailed study of the quantum geometry of a black hole horizon has been made using loop quantum gravity. In mathematics, a diffeomorphism is an isomorphism in the category of smooth manifolds. The master constraint has been employed in attempts to approximate the physical inner product and define more rigorous path integrals. The spatial diffeomorphism constraint with a Hamiltonian gives a Hamiltonian with its smearing shifted.

Version validated by the jury STAR. Symmetry, Integrability and Geometry: As far as is currently known, problem 4 of having semiclassical machinery for non-graph changing operators is at the moment still out of reach.

Loop quantum gravity, like string theory, also aims to overcome the nonrenormalizable divergences of quantum field theories. The vanishing of the constraints, giving the physical phase space, are the four other Einstein equations. In theoretical physics, general covariance is the invariance of the form of physical laws under arbitrary differentiable coordinate transformations. The next chapter is about the classical theory, and studies how to discretise gravity in terms of first-order holonomy-flux variables.

Loop quantum gravity The most fundamental representation being the Pauli matrices. Retrieved 14 September On the other hand, the consequences of LQG are radical, because they fundamentally change the nature of space and time quantiquf provide a tentative but detailed physical and mathematical picture of quantum spacetime.

In contrast, loop quantum gravity, like general relativity, is manifestly background independent, eliminating the background required in string theory. Devenez un soutien sur Patreon! Note that the presence of an inner product, viz Eq 4, means there are no superfluous solutions i. One introduces the quantity. They do however generate diffeomorphims on everything else.

Formulating general relativity with triads instead of metrics was not new. We solve, at least approximately, all the quantum constraint equations and for the physical inner product to make physical predictions. The sum over rerouting are chosen as such to make the form of the intertwiner invariant under Gauss gauge transformations. That is, it is a sum over infinitesimal spatial diffeomorphisms constraints where the coefficients of proportionality are not constants but have non-trivial phase space dependence.

These are the defining symmetry transformations of General Relativity since the theory is formulated only in terms of a differentiable manifold. An oversight in the application of the no-hair theorem is the assumption that the relevant degrees of freedom accounting for the entropy of the black hole must be classical in nature; what if they were purely quantum mechanical instead and had non-zero entropy?

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