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Canonical quantum gravity information


In physics, canonical quantum gravity is an attempt to quantize the canonical formulation of general relativity (or canonical gravity). It is a Hamiltonian formulation of Einstein's general theory of relativity. The basic theory was outlined by Bryce DeWitt[1] in a seminal 1967 paper, and based on earlier work by Peter G. Bergmann[2] using the so-called canonical quantization techniques for constrained Hamiltonian systems invented by Paul Dirac.[3] Dirac's approach allows the quantization of systems that include gauge symmetries using Hamiltonian techniques in a fixed gauge choice. Newer approaches based in part on the work of DeWitt and Dirac include the Hartle–Hawking state, Regge calculus, the Wheeler–DeWitt equation and loop quantum gravity.

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Canonical quantum gravity

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In physics, canonical quantum gravity is an attempt to quantize the canonical formulation of general relativity (or canonical gravity). It is a Hamiltonian...

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Loop quantum gravity

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of quantum space. Research has evolved in two directions: the more traditional canonical loop quantum gravity, and the newer covariant loop quantum gravity...

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Quantum gravity

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Quantum gravity (QG) is a field of theoretical physics that seeks to describe gravity according to the principles of quantum mechanics. It deals with environments...

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Canonical

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states of the system Canonical quantum gravity, an attempt to quantize the canonical formulation of general relativity Canonical stress–energy tensor...

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Euclidean quantum gravity

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physics, Euclidean quantum gravity is a version of quantum gravity. It seeks to use the Wick rotation to describe the force of gravity according to the...

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Induced gravity

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Induced gravity (or emergent gravity) is an idea in quantum gravity that spacetime curvature and its dynamics emerge as a mean field approximation of...

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Shape dynamics

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consequence of shape dynamics is the absence of a problem of time in canonical quantum gravity. The replacement of the spacetime picture with a picture of evolving...

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Entropic gravity

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describes gravity as an emergent phenomenon that springs from the quantum entanglement of small bits of spacetime information. As such, entropic gravity is said...

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Quantum cosmology

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cosmology Top-down cosmology Non-standard cosmology Loop quantum gravity Canonical quantum gravity Dark energy Minisuperspace Hamilton–Jacobi–Einstein equation...

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Gravity

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develop a theory of gravity consistent with quantum mechanics, a quantum gravity theory, which would allow gravity to be united in a common mathematical framework...

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Canonical coordinates

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Symplectomorphism Kinetic momentum Complementarity (physics) Canonical quantization Canonical quantum gravity Goldstein, Herbert; Poole, Charles P. Jr.; Safko, John...

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Semiclassical gravity

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Semiclassical gravity is an approximation to the theory of quantum gravity in which one treats matter and energy fields as being quantum and the gravitational...

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ADM formalism

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formulation of general relativity that plays an important role in canonical quantum gravity and numerical relativity. It was first published in 1959. The...

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Bryce DeWitt

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quantization of general relativity and, in particular, developed canonical quantum gravity, manifestly covariant methods, and heat kernel algorithms.  DeWitt...

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List of unsolved problems in physics

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1/121453. Isham, C. J. (1993). "Canonical Quantum Gravity and the Problem of Time". Integrable Systems, Quantum Groups, and Quantum Field Theories. NATO ASI...

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General relativity

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"Prima facie questions in quantum gravity", in Ehlers, Jürgen; Friedrich, Helmut (eds.), Canonical Gravity: From Classical to Quantum, Springer, ISBN 978-3-540-58339-4...

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Asymptotic safety in quantum gravity

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Although originally proposed by Steven Weinberg to find a theory of quantum gravity, the idea of a nontrivial fixed point providing a possible UV completion...

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Problem of time

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constraints. These are lattice approximation techniques for quantum gravity. In the canonical approach, if one discretizes the constraints and equations...

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Gravity filtration

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Gravity filtration is a method of filtering impurities from solutions by using gravity to pull liquid through a filter. The two main kinds of filtration...

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Loop quantum cosmology

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Loop quantum cosmology (LQC) is a finite, symmetry-reduced model of loop quantum gravity (LQG) that predicts a "quantum bridge" between contracting and...

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Physics beyond the Standard Model

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direction are supersymmetry, loop quantum gravity, and String theory. Theories of quantum gravity such as loop quantum gravity and others are thought by some...

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Rainbow gravity theory

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relativity and quantum mechanics. Scientists are currently attempting to detect rainbow gravity using the Large Hadron Collider. Rainbow gravity theory's origin...

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Loop representation in gauge theories and quantum gravity

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natural nonperturbative description of Einstein's theory. In canonical quantum gravity the difficulties in using the continuous loop representation are...

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Massive gravity

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In theoretical physics, massive gravity is a theory of gravity that modifies general relativity by endowing the graviton with a nonzero mass. In the classical...

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Alternatives to general relativity

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theories. Finally, the most ambitious theories attempt to both put gravity in quantum mechanical terms and unify forces; these are called theories of everything...

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