Observing 4d baby universes in quantum gravity

@article{Ambjorn1993Observing4B,
  title={Observing 4d baby universes in quantum gravity},
  author={Jan Ambjorn and S. Jain and Jerzy Jurkiewicz and Charlotte Kristjansen},
  journal={Physics Letters B},
  year={1993},
  volume={305},
  pages={208-213}
}
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Baby Universes in 2d Quantum Gravity
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We study 4D simplicial quantum gravity in the dynamical triangulation approach with a nontrivial class of measures. We find that the measure contribution plays an important role, influencing the
World-sheet geometry and baby universes in 2D quantum gravity
ON THE PHASE DIAGRAM OF THREE-DIMENSIONAL SIMPLICIAL QUANTUM GRAVITY
The phase diagram of three-dimensional (3d) simplicial quantum gravity is studied using the Monte–Carlo simulation method. It is found that the behavior of the entropy of manifolds, unambiguously
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