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Paper   IPM / P / 8402
School of Physics
  Title:   Matrix Model for DLCQ of AdS IIB String Theory from Unstable Non-BPS D0-Branes
  Author(s):  M. Torabian
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  76
  Year:  2007
  Pages:   026006
  Supported by:  IPM
Based on a system of J number of unstable non-BPS D0-branes of type IIB theory in the light-cone gauge and on the plane-wave background, we construct a 1-parameter family of 0+1-dimensional 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 light-cone quantization (DLCQ) of type IIB string theory in the sector with J units of light-cone momentum on the AdS (and/or plane-wave) background. At the minima, where the tachyon has been condensed, non-BPS D0-branes have been blown up to configurations of fuzzy 3-spheres which go over to BPS spherical D3-brane giant gravitons in the string theory (continuum) limit J→∞.

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