Gravitationally induced decoherence vs space-time diffusion: testing the quantum nature of gravity. [PDF]
Nat Commun, 2023 We consider two interacting systems when one is treated classically while the other system remains quantum. Consistent dynamics of this coupling has been shown to exist, and explored in the context of treating space-time classically.
Oppenheim J +3 more
europepmc +3 more sources
An Ultralocal Classical and Quantum Gravity Theory [PDF]
Journal of High Energy Physics Gravitation and Cosmology, 2020 An ultralocal form of any classical field theory eliminates all spatial derivatives in its action functional, e.g., in its Hamiltonian functional density.
J. Klauder
semanticscholar +5 more sources
Classical gauge theory of gravity [PDF]
Theor.Math.Phys. 132 (2002) 1163-1171; Teor.Mat.Fiz. 132 (2002)
318-328, 2002 The classical theory of gravity is formulated as a gauge theory on a frame bundle with spontaneous symmetry breaking caused by the existence of Dirac fermionic fields. The pseudo-Riemannian metric (tetrad field) is the corresponding Higgs field. We consider two variants of this theory.
G. Sardanashvily
arxiv +3 more sources
Causality and superluminal behavior in classical field theories: Applications to k-essence theories and modified-Newtonian-dynamics-like theories of gravity [PDF]
, 2006 Field theories with Lorentz (or diffeomorphism invariant) action can exhibit superluminal behavior through the breaking of local Lorentz invariance. Quantum induced superluminal velocities are well-known examples of this effect.
Jean-Philippe Bruneton
semanticscholar +3 more sources
Effective action of dilaton gravity as the classical double copy of Yang-Mills theory [PDF]
Physical Review D, 2018 We compute the classical effective action of color charges moving along worldlines by integrating out the Yang-Mills gauge field to next-to-leading order in the coupling.
J. Plefka +2 more
semanticscholar +3 more sources
Classical evolution and quantum generation in generalized gravity theories including string corrections and tachyons : Unified analyses [PDF]
, 2004 We present cosmological perturbation theory based on generalized gravity theories including string theory correction terms and a tachyonic complication.
J. Hwang, H. Noh
semanticscholar +3 more sources
Renormalizable acausal theories of classical gravity coupled with interacting quantum fields [PDF]
, 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 +14 more
core +3 more sources
Classical Weyl Transverse Gravity [PDF]
, 2016 We study various classical aspects of the Weyl transverse (WTDiff) gravity in a general space-time dimension. First of all, we clarify a classical equivalence among three kinds of gravitational theories, those are, the conformally-invariant scalar tensor
Oda, Ichiro
core +2 more sources
Entropy-current for dynamical black holes in Chern-Simons theories of gravity [PDF]
Journal of High Energy Physics, 2023 We construct an entropy current and establish a local version of the classical second law of thermodynamics for dynamical black holes in Chern-Simons (CS) theories of gravity.
Ishani Deo, Prateksh Dhivakar, N. Kundu
semanticscholar +1 more source
Reconstructing wormhole solutions in curvature based Extended Theories of Gravity [PDF]
The European Physical Journal C, 2021 Static and spherically symmetric wormhole solutions can be reconstructed in the framework of curvature based Extended Theories of Gravity. In particular, extensions of the General Relativity, in metric and curvature formalism give rise to modified ...
Vittorio De Falco +3 more
semanticscholar +1 more source