Results 11 to 20 of about 178,359 (292)

Classical theories of gravity produce entanglement. [PDF]

Nature
Abstract The unification of gravity and quantum mechanics remains one of the most profound open questions in science. With recent advances in quantum technology, an experimental idea first proposed by Richard Feynman 1 is now regarded as a promising route to testing this ...
Aziz J, Howl R.
europepmc   +5 more sources

Renormalizable acausal theories of classical gravity coupled with interacting quantum fields [PDF]

Classical and Quantum Gravity, 2006
We prove the renormalizability of various theories of classical gravity coupled with interacting quantum fields. The models contain vertices with dimensionality greater than four, a finite number of matter operators and a finite or reduced number of ...
't Hooft G, Anselmi D, Anselmi D, Birrel N D, Bohr N, Collins J, Damiano Anselmi, DeWitt B, Feynman R P, Ford L H, Jackson J D, Keldysh L V, Milenko Halat, Møller C, Weinberg S   +14 more
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Unified Theory of Gravity and Electromagnetism: Classical and Quantum Aspects

SSRN Electronic Journal, 2021
A unified classical theory of gravity and electromagnetism with a torsion vector  0, proposed by S N Bose in 1952, is introduced. In this theory, the torsion vector acts as a magnetic current and it is shown that (i) the electromagnetism is invariant under continuous Heaviside–Larmor transformations and (ii) the electric and magnetic charges are ...
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A Postquantum Theory of Classical Gravity?

Physical Review X, 2023
The effort to discover a quantum theory of gravity is motivated by the need to reconcile the incompatibility between quantum theory and general relativity. Here, we present an alternative approach by constructing a consistent theory of classical gravity coupled to quantum field theory.
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Hamiltonian approach to GR – Part 1: covariant theory of classical gravity [PDF]

The European Physical Journal C, 2017
A challenging issue in General Relativity concerns the determination of the manifestly-covariant continuum Hamiltonian structure underlying the Einstein field equations and the related formulation of the corresponding covariant Hamilton-Jacobi theory. The task is achieved by adopting a synchronous variational principle requiring distinction between the
Cremaschini, Claudio, Tessarotto, Massimo   +1 more
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On scalar and vector fields coupled to the energy-momentum tensor

Journal of High Energy Physics, 2018
We consider theories for scalar and vector fields coupled to the energy-momentum tensor. Since these fields also carry a non-trivial energy-momentum tensor, the coupling prescription generates self-interactions. In analogy with gravity theories, we build
Jose Beltrán Jiménez, Jose A. R. Cembranos, Jose M. Sánchez Velázquez   +2 more
doaj   +1 more source

Integrability of classical strings dual for noncommutative gauge theories [PDF]

, 2014
We derive the gravity duals of noncommutative gauge theories from the Yang-Baxter sigma model description of the AdS_5xS^5 superstring with classical r-matrices.
Matsumoto, Takuya, Yoshida, Kentaroh
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Gravitational SL(2, ℝ) algebra on the light cone

Journal of High Energy Physics, 2021
In a region with a boundary, the gravitational phase space consists of radiative modes in the interior and edge modes at the boundary. Such edge modes are necessary to explain how the region couples to its environment.
Wolfgang Wieland
doaj   +1 more source

Symmetry, Gravity and Noncommutativity [PDF]

, 2006
We review some aspects of the implementation of spacetime symmetries in noncommutative field theories, emphasizing their origin in string theory and how they may be used to construct theories of gravitation. The geometry of canonical noncommutative gauge
Alekseev A Yu, Alishahiha M, Ambjørn J, Ambjørn J, Aschieri P, Aschieri P, Balachandran A P Govindarajan T R Gupta K S Kurkcuoglu S, Bertolami O, Bieliavsky P, Buric M, Cacciatori S, Calmet X, Calvo I Falceto F, Cardella M A, Cattaneo A S Felder G, Chakraborty B, Chari V, Das S R, Dhar A, Figueroa-O'Farrill J M, Gross D J, Halliday S, Halliday S, Harvey J A, Harvey J A, Hashimoto A, Hashimoto A, Herbst M, Herbst M, Ho P-M, Ishibashi N, Jevicki A, Kar S Majumdar S, Kar S Majumdar S, Kathotia V, Kobakhidze A, Kurkcuoglu S Saemann C, Lizzi F, Madore J, Madore J, Moller L, Richard J Szabo, Robbins D, Schomerus V, Seiberg N, Shoikhet B, Szabo R J, Szabo R J, Wess J   +48 more
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Large Quantum Gravity Effects: Unforeseen Limitations of the Classical Theory [PDF]

Physical Review Letters, 1996
3-dimensional gravity coupled to Maxwell (or Klein-Gordon) fields is exactly soluble under the assumption of axi-symmetry. The solution is used to probe several quantum gravity issues. In particular, it is shown that the quantum fluctuations in the geometry are large unless the number and frequency of photons satisfy the inequality $\N(\hbar G )^2 <
openaire   +3 more sources