Hellmann, Frank

Lorentzian spin foam amplitudes: graphical calculus and asymptotics

Barrett, J. W., Dowdall, R. J., Fairbairn, W. J., Hellmann, F., & Pereira, R. (2010) · Classical and Quantum Gravity

Noncommutative and Quantum Gravity TheoriesRelativity and Gravitational Theory

Cited by 247

Asymptotic analysis of the Engle–Pereira–Rovelli–Livine four-simplex amplitude

Barrett, J. W., Dowdall, R. J., Fairbairn, W. J., Gomes, H., & Hellmann, F. (2009) · Journal of Mathematical Physics

Noncommutative and Quantum Gravity TheoriesRelativity and Gravitational Theory

Cited by 224

Operator spin foam models

Bahr, B., Hellmann, F., Kamiński, W., Kisielowski, M., & Lewandowski, J. (2011) · Classical and Quantum Gravity

Noncommutative and Quantum Gravity TheoriesRelativity and Gravitational Theory

Cited by 63