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Causal dynamical triangulation (abbreviated as CDT) invented by Renate Loll, Jan Ambjørn and Jerzy Jurkiewicz, and popularized by Fotini Markopoulou and Lee Smolin, is an approach to quantum gravity that like loop quantum gravity is background independent.
Anders Sandberg has presented a calculation based on theories of information physics and quantum gravity, establishing an upper bound of 8.6766×1049 angels.
Later in 1957, he went to Syracuse University as a postdoc to research quantum gravity - collaborating with Peter Bergmann, and remained at Syracuse as assistant professor and associate professor, until 1963 when he left to join the Physics Department at Yeshiva University in New York City.
R.D. Sorkin, E. Woolgar; A Causal Order for Spacetimes with C^0 Lorentzian Metrics: Proof of Compactness of the Space of Causal Curves; Classical & Quantum Gravity 13: 1971-1994 (1996); arXiv:gr-qc/9508018 (Causal Structure)
Rodolfo Gambini and Jorge Pullin, Loops, Knots, Gauge Theories and Quantum Gravity, Cambridge University Press (1996)
He is a quantum gravity researcher who is known for the Barrett-Crane model of quantum gravity.
Pullin, Gambini, and Bernd Brügman also wrote a series of papers that make an important connection between knot theory and quantum gravity, by showing that the Jones polynomial can be used to solve a quantum form of Einstein's equations.
The Sokal Affair, physicist Alan Sokal's hoax paper entitled, "Transgressing the Boundaries: Towards a Transformative Hermeneutics of Quantum Gravity" was published in the journal Social Text.