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]

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  1. ^ Okui, Takemichi (2006). "Probing composite gravity in colliders". Physical Review D. 73 (7): 075012. arXiv:hep-ph/0511082. Bibcode:2006PhRvD..73g5012O. doi:10.1103/PhysRevD.73.075012. Retrieved 2008-07-08.