String Theory Seminar

Thursday, November 30, 2000, 4:30pm
Antal Jevicki (Brown University)
Fluctuations of the Giant Graviton
Gravitons moving in AdSm x Sn spacetimes along the Sn blow up into spherical (n-2) branes whose radius increases with increasing angular momentum providing an implementation of "the stringy exclusion principle." We show that this bound is present only for states which saturate a BPS-like condition involving the energy E and angular momentum J, E <= J/R, where R is the radius of Sn. As an example of motions which do not obey the exclusion principle bound, we show that there are finite action instanton configurations interpolating between two possible BPS states. We suggest that this is consistent with the proposal that there is an effective description in terms of supergravity on a noncommutative space and noncommutativity arises here because of imposing supersymmetry. Quantum fluctuations of the Giant graviton are also discussed.
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