Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-02-02
Physics
High Energy Physics
High Energy Physics - Theory
11 pages. Section 5 changed: some confusion corrected and explanations added
Scientific paper
The key to membrane theory is to enlarge the diffeomorphism group until 4D gravity becomes almost topological. Just one ghost survives and its central charges can cancel against matter. A simple bosonic membrane emerges, but its flat D = 28 target space is unstable. Adding supersymmetry ought to give calculable (2,2) membranes in 12 target dimensions, but (2,1) membranes won't work.
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