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Paper IPM / P / 8402  


Abstract:  
Based on a system of J number of unstable nonBPS D0branes of
type IIB theory in the lightcone gauge and on the planewave
background, we construct a 1parameter family of 0+1dimensional
U(J) gauge theories in the form of supersymmetric matrix quantum
mechanics. This configuration suffers from tachyonic instability
which dynamically stabilizes through the process of open string
tachyon condensation. At the true extrema of the effective potential
and by taking kinematical low energy limit to decouple the heavy
modes, it leads to a Matrix theory which we propose to be the
discrete lightcone quantization (DLCQ) of type IIB string theory in
the sector with J units of lightcone momentum on the AdS (and/or
planewave) background. At the minima, where the tachyon has been
condensed, nonBPS D0branes have been blown up to configurations of
fuzzy 3spheres which go over to BPS spherical D3brane giant
gravitons in the string theory (continuum) limit
J→∞.
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