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.
transparencies
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