A Note on Marginally Stable Bound States in Type Ii String Theory
نویسنده
چکیده
Spectrum of elementary string states in type II string theory contains ultra-short multiplets that are marginally stable. U -duality transformation converts these states into bound states at threshold of p-branes carrying Ramond-Ramond charges, and wrapped around p-cycles of a torus. We propose a test for the existence of these marginally stable bound states. Using the recent results of Polchinski and of Witten, we argue that the spectrum of bound states of p-branes is in agreement with the prediction of U -duality. On leave of absence from Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400005, INDIA E-mail: [email protected], [email protected]
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