Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1997-01-30
Phys.Lett. B400 (1997) 37-42
Physics
High Energy Physics
High Energy Physics - Theory
harvmac, 9 pages
Scientific paper
10.1016/S0370-2693(97)00322-5
The (q_1,q_2) SL(2,Z) string bound states of type IIB superstring theory admit two inequivalent (T-dual) representations in eleven dimensions in terms of a fundamental 2-brane. In both cases, the spectrum of membrane oscillations can be determined exactly in the limit $g^2\to \infty $, where $g^2$ is the type IIA string coupling. We find that the BPS mass formulas agree, and reproduce the BPS mass spectrum of the $(q_1,q_2)$ string bound state. In the non-BPS sector, the respective mass formulas apply in different corners of the moduli space. The axiomatic requirement of T-duality in M-theory permits to derive a discrete mass spectrum in a (thin torus) region where standard supermembrane theory undergoes instabilities.
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