Tsunehide Kuroki, Yuki Sato
Wormhole-Dominant Phase of the Double-Trace Matrix Model in Two-Dimensional Quantum Gravity
An analysis of how microscopic wormholes reshape two-dimensional quantum gravity, modeled by a Hermitian one-matrix model with a double-trace interaction. Students learn that at the critical double-trace coupling the wormhole-dominant continuum disk amplitude coincides with that of pure 2D gravity, and that a renormalized double-trace coupling effectively shifts the renormalized bulk cosmological constant.