We show that the phase transition previously observed in dynamical triangulation models of quantum gravity can be understood as being due to the creation of a singular link. The transition between singular and non-singular geometries as the gravitational coupling is varied appears to be first order.
Catterall, Simon; Renken, R.; and Kogut, John B., "Singular Structure in 4D Simplicial Gravity" (1997). Physics. 480.
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