WebFeb 10, 2016 · Classical GR predicts gravitational waves (GW) propagate at the speed of light and have no dispersion. It also predicts no monopolar or dipolar radiation. Another …
What every layperson should know about Quantum Loop Gravity
Web2 days ago · The standard model describes three out of the four fundamental forces in the universe – electromagnetism, and the “strong” and “weak” forces which govern the atomic nucleus – excluding gravity.... WebA quantum theory of gravity needs to fix both of these issues - but we’re going to focus on background independence for now. The position and momentum of quantum mechanics … periwinkle tincture
Loops, Knots, Gauge Theories and Quantum Gravity
WebJan 29, 2014 · Loop representations (and the related topic of knot theory) are of considerable current interest because they provide a unified arena for the study of the gauge invariant quantization of... WebApr 13, 2024 · Loop quantum gravity, for instance, the theory of spin foams and spin networks which atomises the spacetime of general relativity, is not cancelled out as a … Loop quantum gravity (LQG) is a theory of quantum gravity, which aims to merge quantum mechanics and general relativity, incorporating matter of the Standard Model into the framework established for the pure quantum gravity case. It is an attempt to develop a quantum theory of gravity based directly on … See more In 1986, Abhay Ashtekar reformulated Einstein's general relativity in a language closer to that of the rest of fundamental physics, specifically Yang–Mills theory. Shortly after, Ted Jacobson and Lee Smolin realized that the … See more Dirac observables The constraints define a constraint surface in the original phase space. The gauge motions of the constraints apply to all phase space but have the feature that they leave the constraint surface where it is, and thus the orbit … See more In loop quantum gravity (LQG), a spin network represents a "quantum state" of the gravitational field on a 3-dimensional hypersurface. The set of all possible spin networks (or, more accurately, "s-knots" – that is, equivalence classes of spin networks under … See more The master constraint Thiemann's Master Constraint Programme for Loop Quantum Gravity (LQG) was proposed as a … See more LQG is formally background independent. Meaning the equations of LQG are not embedded in, or dependent on, space and time (except for its invariant topology). Instead, they are … See more Pre-history and Ashtekar new variables Many of the technical problems in canonical quantum gravity revolve around the constraints. Canonical general relativity was originally formulated in terms of metric variables, but there seemed to be insurmountable … See more The Classical limit is the ability of a physical theory to approximate classical mechanics. It is used with physical theories that predict … See more periwinkle tincture benefits