Is there a unique consistent theory of quantum gravity?

Details Is there a unique consistent theory of quantum gravity? Is there a unique consistent theory of quantum gravity?

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gregr..21..545b&link_type=abstract

General Relativity and Gravitation, Volume 21, Issue 6, pp.545-550

Physics

2

Scientific paper

Superstrings have been proposed as a quantum-theoretical framework for unifying all the fundamental forces, including gravity. We consider the question of whether there might be more general supersymmetric possibilities, based on higher extended objects such as membranes, jellies, etc. We argue that all the possible extended objects in all possible spacetime dimensions are quantummechanically inconsistent except for the 10-dimensional superstring and the 11-dimensional supermembrane. These are also the only two such theories that contain massless gravitons and, thus, that can describe gravity at low energies. It is remarkable that the range of possibilities can be narrowed down to this extent. Whether these can be further narrowed down to just one consistent theory remains open to further research.

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