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Origin of the SO(9)→SO(3)×SO(6) symmetry breaking in the type IIB matrix model

Robert Brandenberger* and Julia Pasiecznik†

  • *Contact author: rhb@physics.mcgill.ca
  • †Contact author: Julia.Pasiecznik@mail.mcgill.ca

Phys. Rev. D 112, 026006 – Published 2 July, 2025

DOI: https://doi.org/10.1103/bqzp-n28g

Abstract

We suggest a dynamical mechanism which explains why, in the supersymmetric Ishibashi-Kawai-Kitazawa-Tsuchiya matrix model, the SO(9) symmetry of the Lagrangian is spontaneously broken to SO(3)×SO(6), allowing only three large classical spatial dimensions to emerge. The argument relies on the identification of D-strings as stable excitations of the matrices about the cosmological background and the absence of forces between parallel D-string excitations. A spatial dimension can only become large if the D-strings winding in that direction can annihilate. In the absence of forces, this requires the string-world sheets to intersect, a process which is highly suppressed if more than three dimensions of space are large. Implications for a recently proposed matrix cosmology scenario are discussed.

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