Faculty

	Laurent Freidel PhD Ecole Normale (1994) Quantum Gravity
	Phone:	(519) 569-7600 x7621
	Email:	lfreidel[at]perimeterinstitute.ca
	Personal Webpage:	http://www.perimeterinstitute.ca/personal/lfreidel/

Laurent Freidel, PhD L’ecole Normale Superieure de Lyon (1994), has made many notable contributions in the field of Quantum Gravity and joined Perimeter Institute as its ninth faculty member in September 2006.

Freidel is a mathematical physicist with outstanding knowledge of a wide range of areas including integrable systems, topological field theories, 2d conformal field theory and QCD (Quantum Chromodynamics). He has authored or co-authored almost 40 publications, many of which are known among fellow researchers for offering particularly complete, detailed arguments. Freidel is also the author or co-author of several significant papers on spin foam models – higher-dimensional diagrams that operate as models of the quantum geometry of spacetime in loop quantum gravity. He also contributes to further research on the low energy limit of spin foam models including new proposed formulations and coupling to matter.

Since receiving his PhD, Freidel has held positions as Penn State University and L’ecole Normale and has been a member of France’s Centre National de la Recherche Scientifique (CNRS) since 1995. Dr. Freidel is also the recipient of several awards including two ACI-Blanche grants in France. He has been a Long Term Visitor at Perimeter Institute since 2002 where, in addition to his scientific contributions, he has mentored several graduate students and postdoctoral researchers as well as co-organizing high-level international conferences in Quantum Gravity and mathematics.

Affiliations

Positions Held

• 2002-2009 Adjunct professor at Waterloo university
• 1997-1999 Postdoctoral position at Penn state University, State college PA
• 1994-2006 Charge de recherche in CNRS, ENS-Lyon, France

Awards

• US academy of science Kavli Fellow., 2008-11-01
• Recipient of the ACI-"Jeunes chercheurs" award (pro jet 1032): "geometrical structures of black Holes" , 2002-05-01
• Recipient of the ACI-blanche award 2078 CDR2: "Quantum Gravity", 1999-05-01

Recent Publications

• Laurent Freidel and Etera R. Livine, ``The Fine Structure of SU(2) Intertwiners from U(N) Representations,'' arxiv: 0911.3553, 2009-11-01
• Laurent Freidel, Razvan Gurau, Daniele Oriti, Group field theory renormalization - the 3d case: power counting of divergences, Phys.Rev.D80:044007,2009, arxiv: 0905.3772, 2009-05-22
• L. Freidel, K. Krasnov and E. R. Livine, ``Holomorphic Factorization for a Quantum Tetrahedron,'' submitted for publication in Comm. Math. Phys., arxiv: 0905.3627, 2009-05-09
• L. Freidel, R. Gurau and D. Oriti, ``Group field theory renormalization - the 3d case: power counting of divergences, Phys. Rev. D 80, 044007 (2009), arxiv: 0905.3772, 2009-05-01
• Y. K. Cheung and L. Freidel, ``Inner brane: A D3-brane in the Nappi-Witten model from an inner group automorphism,'' Phys. Rev. D 79, 126007 (2009) arxiv: 0905.0540, 2009-05-01
• F. Conrady and L. Freidel, ``Quantum geometry from phase space reduction,'' arxiv: 0902.0351, 2009-02-01
• L. Freidel, ``Modified gravity without new degrees of freedom,'' arxiv: 0812.3200, 2008-12-01
• John Baez, Aristide Baratin, Laurent Freidel and Derek Wise.``Infinite-dimensional representations of 2-groups'', arxiv: 0812.4969, 2008-12-01
• F. Conrady and L. Freidel, ``On the semiclassical limit of 4d spin foam models,'' Phys. Rev. D 78, 104023 (2008) arxiv: 0809.2280, 2008-09-01
• L. Freidel and J. P. Ryan, ``Spin Foam Models: The Dynamics Of Quantum Geometry,'' Class. Quant. Grav. 25 (2008) 114004.
• F. Conrady and L. Freidel, ``Path integral representation of spin foam models of 4d gravity,'' Class. Quant. Grav. 25, 245010 (2008), arxiv: 0806.4640, 2008-06-01
• L. Freidel, ``Reconstructing AdS/CFT,'' arxiv: 0804.0632, 2008-04-01
• L. Freidel, R. G. Leigh, D. Minic and A. Yelnikov, ``On the spectrum of pure Yang-Mills theory,'' arxiv: 0801.1113, 2008-01-01
• L. Freidel and K. Krasnov, ``A New Spin Foam Model for 4d Gravity,'' Class. Quant. Grav. 25, 125018 (2008) arxiv: 0708.1595, 2007-08-01
• L. Freidel and J. Kowalski-Glikman, ``$\kappa$-Minkowski space, scalar field, and the issue of Lorentz invariance,'' arxiv: 0710.2886, 2007-07-01
• B. Dittrich, L. Freidel and S. Speziale, ``Linearized dynamics from the 4-simplex Regge action,'' Phys. Rev. D 76, 104020 (2007) arxiv: 0707.4513, 2007-07-01
• L. Freidel, J. Kowalski-Glikman and S. Nowak, ``Field theory on $\kappa$--Minkowski space revisited: Noether charges and breaking of Lorentz symmetry,'' Int. J. Mod. Phys. A 23, 2687 (2008), arxiv: 0706.3658, 2007-06-01
• L. Freidel, F. Girelli and E. R. Livine, ``The Relativistic Particle: Dirac observables and Feynman propagator,'' Phys. Rev. D 75, 105016 (2007) arxiv: hep-th/0701113, 2007-01-01
• L. Freidel, J. Kowalski-Glikman and S. Nowak, ``From noncommutative kappa-Minkowski to Minkowski space-time,'' Phys. Lett. B 648, 70 (2007) arxiv: hep-th/0612170, 2006-12-01
• A. Baratin and L. Freidel, ``Hidden quantum gravity in 4d Feynman diagrams: Emergence of spin foams,'' Class. Quant. Grav. 24, 2027 (2007) arxiv: hep-th/0611042, 2006-11-01
• L. Freidel, J. Kowalski-Glikman and A. Starodubtsev, ``Particles as Wilson lines of gravitational field,'' Phys. Rev. D bf 74, 084002 (2006) arxiv: 0607014, 2006-07-01
• L. Freidel, R. G. Leigh and D. Minic, ``Towards a solution of pure Yang-Mills theory in 3+1 dimensions,'' Phys. Lett. B 641, 105 (2006) arxiv: hep-th/0604184, 2006-04-01
• L. Freidel, ``On pure Yang-Mills theory in 3+1 dimensions: Hamiltonian, vacuum and gauge %invariant variables'', arxiv: hep-th/0604185, 2006-04-01
• A. Baratin and L. Freidel, ``Hidden Quantum Gravity in 3d Feynman diagrams,'' Class. Quant. Grav. 24, 1993 (2007) arxiv: gr-qc/0604016, 2006-04-01
• L. Freidel, K. Noui and P. Roche, ``6J symbols duality relations,'' J. Math. Phys. 48}, 113512 (2007) arxiv: hep-th/0604181, 2006-04-01
• L. Freidel and S. Majid, ``Noncommutative Harmonic Analysis, Sampling Theory and the Duflo Map in 2+1 Quantum Gravity,'' Class. Quant. Grav. 25, 045006 (2008) arxiv: 0601004, 2006-01-01
• L. Freidel and E. R. Livine, ``Effective 3d quantum gravity and non-commutative quantum field theory,'' Phys. Rev. Lett. 96, 221301 (2006) arxiv: hep-th/0512113, 2005-12-01
• Laurent Freidel, Djordje Minic, Tatsu Takeuchi, Quantum Gravity, Torsion, Parity Violation and all that, Phys.Rev. D72 (2005) 104002, arxiv: hep-th/0507253, 2005-07-26
• L. Freidel, D. Oriti and J.~Ryan, ``A group field theory for 3d quantum gravity coupled to a scalar field,'' arxiv: gr-qc/0506067, 2005-06-01
• Laurent Freidel (PI, ENS-Lyon), Group Field Theory: An overview, Int.J.Theor.Phys. 44 (2005) 1769-1783, arxiv: hep-th/0505016, 2005-05-02
• L. Freidel and E. R. Livine, ``Ponzano-Regge model revisited. III: Feynman diagrams and effective field theory,'' Class Quant. Grav. {\bf 23}, 2021 (2006) arxiv: hep-th/0502106, 2005-02-01
• L. Freidel and A. Starodubtsev, ``Quantum gravity in terms of topological observables,'' arxiv: hep-th/0501191, 2005-01-01
• Laurent Freidel, R.B. Mann, Eugeniu M. Popescu, Canonical analysis of the BCEA topological matter model coupled to gravitation in (2+1) dimensions, Class.Quant.Grav. 22 (2005) 3363-3380, arxiv: gr-qc/0411117, 2004-11-25
• Laurent Freidel, David Louapre, Ponzano-Regge model revisited I: Gauge fixing, observables and interacting spinning particles, Class.Quant.Grav. 21 (2004) 5685-5726, arxiv: hep-th/0401076, 2004-01-12
• Laurent Freidel, Lee Smolin, The linearization of the Kodama state, Class.Quant.Grav. 21 (2004) 3831-3844, arxiv: hep-th/0310224, 2003-10-23
• Yeuk-Kwan E. Cheung, Laurent Freidel, Konstantin Savvidy, Strings in Gravimagnetic Fields, JHEP 0402 (2004) 054, arxiv: hep-th/0309005, 2003-08-29
• Laurent Freidel, Jerzy Kowalski-Glikman, Lee Smolin, 2+1 gravity and Doubly Special Relativity, Phys.Rev. D69 (2004) 044001, arxiv: hep-th/0307085, 2003-07-08
• Laurent Freidel, Etera R. Livine, Carlo Rovelli, Spectra of Length and Area in 2+1 Lorentzian Loop Quantum Gravity, Class.Quant.Grav. 20 (2003) 1463-1478, arxiv: gr-qc/0212077, 2002-12-18
• Laurent Freidel (ENS-Lyon, PI), David Louapre (ENS-Lyon), Diffeomorphisms and spin foam models, Nucl.Phys. B662 (2003) 279-298, arxiv: gr-qc/0212001, 2002-11-29
• Laurent Freidel (PI), David Louapre (ENS Lyon), Non-perturbative summation over 3D discrete topologies, Phys.Rev. D68 (2003) 104004, arxiv: hep-th/0211026, 2002-11-05
• Laurent Freidel (PI, ENS-Lyon), Etera R. Livine (CPT Marseille), Spin Networks for Non-Compact Groups, J.Math.Phys. 44 (2003) 1322-1356, arxiv: hep-th/0205268, 2002-05-27

Seminars

• "Spin Foam models: models of quantum dynamical space time" 12th Marcel Grossman meeting, Keynote speaker, July 12-18, Paris, France., 2009-07-01
• "Spin Foam models: models of quantum dynamical space time" , Max Born symposium, Invited speaker, in Wroclaw, Poland. , 2009-06-01
• "Quantum Geometry from Spin Foam",``Abhay Fest'' conference, 04-06 June, Penn state State college PA, US. , 2009-06-01
• " Recovering low energy physics: A Discussion", International Loop quantum gravity seminar, May 5. http://relativity.phys.lsu.edu/ilqgs/schedulesp09.html, 2009-05-01
• "Spin Foam models: models of quantum dynamical space time", session on quantum gravity at the April meeting of the American Physical Society, Invited speaker, Denver 2-5 May 2009. http://meetings.aps.org/Meeting/APR09/APS_Invited, 2009-05-01
• "A quantum gravity perspective on AdS-CFT", conference of the European science foundation ``Loops and Foams'', Invited speaker, March 3-9, 2008, Zakopane, Poland., 2009-03-01
• "Lectures on Quantum gravity", Invited speaker to the workshop "O Verao Quantico" 15 -20 february, Vitoria, Brasil. , 2009-02-01
• "Quantum models of spacetime", 20th Annual Kavli Frontiers of Science Symposium, Invited speaker, November 6-8 2008, Academy's Arnold and Mabel Beckman Center in Irvine, California US, 2008-11-01
• "Semi-classical limit in spin foam model", Continuum and Lattice Approaches to Quantum Gravity conference, Invited speaker, 17-19 September 2008, University of Sussex, UK, 2008-09-01
• "Non commutative effective field theory from quantum gravity", Second Workshop on Quantum Gravity and Noncommutative Geometry, Universidade LusOfona, Lisbon 22-24 September 2008, 2008-09-01
• "Non commutative effective field theory from quantum gravity", "Noncommutative deformations of special relativity workshop in Edinburgh, Invited speaker, 7-11 July 2008., 2008-07-01
• "Non commutative effective field theory from quantum gravity", 13th Peyresc meeting, Peyresc, France, 2008-07-01
• "Semi-classical limit in spin foam model", QG2 2008 Quantum Geometry and Quantum Gravity Conference, invited speaker, June 30th - Friday July 4th 2008 University of Nottingham, UK, 2008-06-01
• "Effective Field Theory from Quantum Gravity", 12th conference on general relativity and relativistic astrophysics, University of New brunswick, Plenary speaker, frederiction, Canada, 17-19 May 2007., 2008-05-01
• " Quantum gravity perspective on AdS/CFT", International Loop quantum gravity seminar, April 8 Perimeter Institute, 2008-04-01
• "A new spin foam model for 4d gravity", conference of the European science foundation ``Loops and Foams'', Invited speaker, March 3-9, 2008, Zakopane, Poland., 2008-03-01
• "Non commutative effective field theory from quantum gravity", European Science Foundation Workshop on ``Non commutative Quantum Field theory'', Invited speaker, 26-29 November 2007, Vienna, Austria., 2007-11-01
• "Spin foam model of 4d gravity", Quantum gravity in the Southern Cone conference, plenary speaker, October 22-24 2007, Punta del Este, Uruguay. http://qgsciv.fisica.edu.uy , 2007-10-01
• "Spin foam models or the dynamics of quantum space time", GR18 18th international conference on general relativity and gravitation}, plenary speaker, Sydney convention center, Sydney Australia, 8-14 July 2007. http://www.amaldi7.com/plspeakers.html, 2007-07-01