Composite gravity

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In theoretical physics, composite gravity refers to models that attempted to derive general relativity in a framework where the graviton is constructed as a composite bound state of more elementary particles, usually fermions.A theorem by Steven Weinberg and Edward Witten shows that this is not possible in Lorentz covariant theories: massless particles with spin greater than one are forbidden. The AdS/CFT correspondence may be viewed as a loophole in their argument. However, in this case not only the graviton is emergent; a whole spacetime dimension is emergent, too.^[1]

References

↑ "Probing composite gravity in colliders". scitation.aip.org. Retrieved 2008-07-08.

Theories of gravitation

Standard

Newtonian gravity (NG)	Newton's law of universal gravitation History of gravitational theory

General relativity (GR)	Introduction History Mathematics Resources Tests Post-Newtonian formalism Linearized gravity ADM formalism

Alternatives to
general relativity

Paradigms	Classical theories of gravitation Quantum gravity Theory of everything

Early modifications	Einstein–Cartan Bimetric theories Gauge theory gravity Teleparallelism Composite gravity f(R) gravity Massive gravity Modified Newtonian dynamics (MOND) Nonsymmetric gravitation Scalar–tensor theories Brans–Dicke Scalar–tensor–vector Conformal gravity Scalar theories Nordström Whitehead Geometrodynamics Induced gravity Tensor–vector–scalar

Quantisation attempts	Euclidean quantum gravity Canonical Quantum Gravity Wheeler–DeWitt equation Loop quantum gravity Causal dynamical triangulation Causal sets DGP model

Unification attempts	Kaluza–Klein theory Dilaton Supergravity

Unification and quantisation attempts	Noncommutative geometry Self-creation cosmology Semiclassical gravity Superfluid vacuum theory Logarithmic BEC vacuum String theory M-theory F-theory Heterotic string Type I string theory Type 0 string theory Bosonic string theory Type II string theory Little string theory Twistor theory Twistor String theory

Generalisations/Extensions of GR	Liouville gravity Lovelock theory 2+1D topological gravity Gauss–Bonnet gravity Jackiw–Teitelboim gravity

Pre-Newtonian theories
and Toy models

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Composite gravity

See also

References