Simplicial Quantum Gravity From Two to Four Dimensions

摘要: Recent work on Regge’s lattice formulation of quantum gravity is reviewed. The problem the transcription action and measure discussed, a comparison made to expected results in continuum. recovery general coordinate invariance continuum illustrated two-dimensional case, where critical exponents can be compared exact conformal field theory KPZ. In four dimensions strongly suggest that pure Einstein not defined even at non-perturbative level. addition higher derivative terms appears cure unboundedness problem, but nature ground state fixed point structure remains an open question.