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Composite gravity

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Title: Composite gravity  
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Subject: Quantum gravity, RST model, Jackiw–Teitelboim gravity, Liouville gravity, Abstract differential geometry
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Composite gravity

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]

See also

References

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