# Laurent Freidel

Areas of Research:
Phone: x7621

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

University of Waterloo and Lyon, Ecole Normale Superieure

PhD students who wish to be supervised by Perimeter Institute faculty normally apply through the PSI program. To apply directly to a PhD program, students should submit an application to the Physics and Astronomy Department at the University of Waterloo.

Students interested in pursuing an MSc degree should apply to Perimeter Institute's PSI program.

## Research Interests

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 around 80 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.

## Positions Held

• Visiting Professor of Yukawa institute at Kyoto University
• 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

• Recipient of the second award in the 2011 Awards for Essays on Gravitation
• Awarded a NSERC 5 years Discovery Grant of 240,000$• US academy of science Kavli Fellow. • Recipient of the ACI-&quot;Jeunes chercheurs&quot; award (pro jet 1032): &quot;geometrical structures of black Holes&quot; • Recipient of the ACI-blanche award 2078 CDR2: &quot;Quantum Gravity&quot; ## Recent Publications • T. Rempel and L. Freidel, Interaction Vertex for Classical Spinning Particles, arXiv: 1507.05826 [hep-th] • V. Astuti and L. Freidel, Lorentz invariant deformations of momentum space, arXiv: 1507.06459 [hep-th] • L. Freidel and A.~Perez, Quantum gravity at the corner,'' arXiv: 1507.02573 [gr-qc] • L. Freidel, R. G. Leigh and D. Minic, Metastring Theory and Modular Space-time, JHEP 1506 (2015) 006, arXiv: 1502.08005 [hep-th] • L. Freidel, D. Garner and S. Ramgoolam, Permutation combinatorics of worldsheet moduli space, Phys. Rev. D 91 (2015) 12, 126001, arXiv: 1412.3979 [hep-th] • A.Banburski, L. Q. Chen, L. Freidel and J. Hnybida, Pachner moves in a 4d Riemannian holomorphic Spin Foam model, arXiv: 1412.8247 [gr-qc]. • A. Baratin and L. Freidel, A 2-categorical state sum model,' J. Math. Phys. 56 (2015) 1, 011705, arXiv: 1409.3526 • A. Baratin, L. Freidel and R. Gurau, Weighting bubbles in group field theory, Phys. Rev. D 90, 024069 (2014) [arXiv: 1405.2808 [hep-th]]. • L. Freidel and Y. Yokokura, Non-equilibrium thermodynamics of gravitational screens, arXiv: 1405.4881 • L. Freidel, R. G. Leigh and D. Minic, Quantum Gravity, Dynamical Phase Space and String Theory, Int. J. Mod. Phys. D 23 (2014) 12, 1442006, arXiv: 1405.3949 [hep-th]. • L. Freidel, Gravitational Energy, Local Holography and Non-equilibrium Thermodynamics, Class. Quant. Grav. 32 (2015) 5, 055005, arXiv: 1312.1538 [gr-qc]. • L. Freidel and T. Rempel, Action and Vertices in the Worldine Formalism, arXiv: 1312.5396 [hep-th]. • L.~Freidel and T.~Rempel, Scalar Field Theory in Curved Momentum Space, arXiv: 1312.3674 [hep-th]. • Andrzej Banburski, Laurent Freidel. Snyder Momentum Space in Relative Locality, Phys. Rev. D 90 (2014) 7, 076010, arXiv: 1308.0300. • Laurent Freidel, Jonathan Ziprick. Spinning geometry = Twisted geometry, Class. Quant. Grav. 31, 045007 (2014), arXiv: 1308.0040 • Giovanni Amelino-Camelia, Laurent Freidel, Jerzy Kowalski-Glikman, Lee Smolin. Noisy soccer balls Phys.Rev. D88 (2013) 028702, arXiv: 1307.0246 • Laurent Freidel, Robert G. Leigh, Djordje Minic. Born Reciprocity in String Theory and the Nature of Spacetime , Phys. Lett. B 730 (2014) 302, arXiv: 1307.7080 • Laurent Freidel, Jeff Hnybida. A Discrete and Coherent Basis of Intertwiners, Class. Quant. Grav. 31 (2014) 015019, arXiv: 1305.3326 [math-ph] • On the exact evaluation of spin networks. Laurent Freidel, Jeff Hnybida (Perimeter Inst. Theor. Phys.). Jan 2012. 21 pp. e-Print: arXiv: 1201.3613 [gr-qc] • Dirac fields, torsion and Barbero-Immirzi parameter in Cosmology. G. de Berredo-Peixoto (Juiz de Fora U.), L. Freidel (Perimeter Inst. Theor. Phys.), I.L. Shapiro, C.A. de Souza (Juiz de Fora U.). Jan 2012. 16 pp. Published in JCAP 1206 (2012) 017 • Dynamics for a simple graph using the U(N) framework for loop quantum gravity. Enrique F. Borja , Jacobo Diaz-Polo , Laurent Freidel , I. Garay, Etera R. Livine . Published in J.Phys.Conf.Ser. 360 (2012) 012019 • On the relations between gravity and BF theories. Laurent Freidel, Simone Speziale. Jan 2012. 15 pp. Published in SIGMA 8 (2012) 032, e-Print: arXiv: 1201.4247 [gr-qc] PDF • Continuous formulation of the Loop Quantum Gravity phase space. Laurent Freidel, Marc Geiller, Jonathan Ziprick. Oct 2011. 27 pp. Class.Quant.Grav. 30 (2013) 085013, arXiv: 1110.4833 • OPERA neutrinos and deformed special relativity. Giovanni Amelino-Camelia, Laurent Freidel, Jerzy Kowalski-Glikman , Lee Smolin. Oct 2011. Mod.Phys.Lett. A27 (2012) 1250063 • Maite Dupuis, Laurent Freidel, Etera R. Livine, Simone Speziale, Holomorphic Lorentzian Simplicity Constraints, J.Math.Phys. 53 (2012) 032502, arXiv: 1107.5274 • R Giovanni Amelino-Camelia, Laurent Freidel, Jerzy Kowalski-Glikman, Lee Smolin, Relative locality: A deepening of the relativity principle, Gen.Rel.Grav. 43 (2011) 2547-2553, Int.J.Mod.Phys. D20 (2011) 2867-2873, arXiv1106.0313 • Giovanni Amelino-Camelia, Laurent Freidel, Jerzy Kowalski-Glikman, Lee Smolin, Relative locality and the soccer ball problem, Phys.Rev. D84 (2011) 087702, arXiv: 1104.2019 • Laurent Freidel, Lee Smolin, Gamma ray burst delay times probe the geometry of momentum space, arXiv: 1103.5626 • Valentin Bonzom, Laurent Freidel, The Hamiltonian constraint in 3d Riemannian loop quantum gravity Class.Quant.Grav. 28 (2011) 195006, arXiv: 1101.3524 • Giovanni Amelino-Camelia, Laurent Freidel, Jerzy Kowalski-Glikman, Lee Smolin, The principle of relative locality, Phys.Rev. D84 (2011) 084010, arXiv: 1101.0931 • Enrique F. Borja, Laurent Freidel, Inaki Garay, Etera R. Livine, U(N) tools for Loop Quantum Gravity: The Return of the Spinor, Class.Quant.Grav. 28 (2011) 055005, arXiv: 1010.5451 • L.~Freidel and S.~Speziale, From twistors to twisted geometries, Phys.Rev. D82 (2010) 084041, arXiv: 1006.0199 [gr-qc]. • Laurent Freidel and Etera R.Livine, U(N) Coherent States for Loop Quantum Gravity, J.Math.Phys. 52 (2011) 052502, arXiv: 1005.2090 [gr-qc]. • L.~Freidel and S.~Speziale, Twisted geometries: A geometric parametrisation of SU(2) phase space, Phys.Rev. D82 (2010) 084040, arXiv: 1001.2748 [gr-qc]. • Laurent Freidel and Etera R. Livine, The Fine Structure of SU(2) Intertwiners from U(N) Representations, J.Math.Phys. 51 (2010) 082502, arXiv: 0911.3553 • 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 • L. Freidel, K. Krasnov and E. R. Livine, Holomorphic Factorization for a Quantum Tetrahedron, Communication in Mathematical Physics, 297 (2010) 45, arXiv: 0905.3627 • 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 • 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. • F. Conrady and L. Freidel, Quantum geometry from phase space reduction,'' arXiv: 0902.0351 • L. Freidel, Modified gravity without new degrees of freedom,'' arXiv: 0812.3200 • Infinite-Dimensional Representations of 2-Groups. John C. Baez, Aristide Baratin, Laurent Freidel, Derek K. Wise. Dec 2008. 112 pp. Published in Mem.Am.Math.Soc. 219 (2012) 1032, arXiv: 0812.4969 [math.QA] • F. Conrady and L. Freidel, On the semiclassical limit of 4d spin foam models,'' Phys. Rev. D 78, 104023 (2008) arXiv: 0809.2280 • F. Conrady and L. Freidel, Path integral representation of spin foam models of 4d gravity,'' Class. Quant. Grav. 25, 245010 (2008), arXiv: 0806.4640 • L. Freidel and J. P. Ryan, Spin Foam Models: The Dynamics Of Quantum Geometry,'' Class. Quant. Grav. 25 (2008) 114004. • L. Freidel, Reconstructing AdS/CFT,'' arXiv: 0804.0632 • L. Freidel, R. G. Leigh, D. Minic and A. Yelnikov, On the spectrum of pure Yang-Mills theory,'' arXiv: 0801.1113 • L. Freidel and K. Krasnov, A New Spin Foam Model for 4d Gravity,'' Class. Quant. Grav. 25, 125018 (2008) arXiv: 0708.1595 • B. Dittrich, L. Freidel and S. Speziale, Linearized dynamics from the 4-simplex Regge action,'' Phys. Rev. D 76, 104020 (2007) arXiv: 0707.4513 • L. Freidel and J. Kowalski-Glikman, $\kappa$-Minkowski space, scalar field, and the issue of Lorentz invariance,'' arXiv: 0710.2886 • 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
• 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
• 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
• 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
• L. Freidel, J. Kowalski-Glikman and A. Starodubtsev, Particles as Wilson lines of gravitational field,'' Phys. Rev. D bf 74, 084002 (2006) arXiv: gr-qc/0607014 .
• A. Baratin and L. Freidel, Hidden Quantum Gravity in 3d Feynman diagrams,'' Class. Quant. Grav. 24, 1993 (2007) arXiv: gr-qc/0604016
• L. Freidel, On pure Yang-Mills theory in 3+1 dimensions: Hamiltonian, vacuum and gauge %invariant variables'', arXiv: hep-th/0604185
• 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
• L. Freidel, K. Noui and P. Roche, 6J symbols duality relations,'' J. Math. Phys. 48}, 113512 (2007) arXiv: hep-th/0604181
• 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: hep-th/0601004 .
• 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
• Laurent Freidel, Djordje Minic, Tatsu Takeuchi, Quantum Gravity, Torsion, Parity Violation and all that, Phys.Rev. D72 (2005) 104002, arxiv:hep-th/507253
• L. Freidel, D. Oriti and J.~Ryan, A group field theory for 3d quantum gravity coupled to a scalar field,'' arXiv: gr-qc/0506067
• Laurent Freidel (PI, ENS-Lyon), Group Field Theory: An overview, Int.J.Theor.Phys. 44 (2005) 1769-1783, arxiv:hep-th/505016
• 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
• L. Freidel and A. Starodubtsev, Quantum gravity in terms of topological observables,'' arXiv: hep-th/0501191
• 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/411117
• 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/401076
• Laurent Freidel, Lee Smolin, The linearization of the Kodama state, Class.Quant.Grav. 21 (2004) 3831-3844, arxiv:hep-th/310224
• Yeuk-Kwan E. Cheung, Laurent Freidel, Konstantin Savvidy, Strings in Gravimagnetic Fields, JHEP 0402 (2004) 054, arxiv:hep-th/309005
• Laurent Freidel, Jerzy Kowalski-Glikman, Lee Smolin, 2+1 gravity and Doubly Special Relativity, Phys.Rev. D69 (2004) 044001, arxiv:hep-th/307085
• 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/212077
• Laurent Freidel (ENS-Lyon, PI), David Louapre (ENS-Lyon), Diffeomorphisms and spin foam models, Nucl.Phys. B662 (2003) 279-298, arxiv:gr-qc/212001
• Laurent Freidel (PI), David Louapre (ENS Lyon), Non-perturbative summation over 3D discrete topologies, Phys.Rev. D68 (2003) 104004, arxiv:hep-th/211026
• 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/205268
• Maite Dupuis, Laurent Freidel, Etera R. Livine, Simone Speziale, Holomorphic Lorentzian Simplicity Constraints arXiv: 1107.5274
• Relative locality: A deepening of the relativity principle, Giovanni Amelino-Camelia, Laurent Freidel, Jerzy Kowalski-Glikman, Lee Smolin, arxiv1106.0313
• Relative locality and the soccer ball problem, Giovanni Amelino-Camelia, Laurent Freidel, Jerzy Kowalski-Glikman, Lee Smolin, arxivarXiv: 1104.2019
• Gamma ray burst delay times probe the geometry of momentum space, Laurent Freidel, Lee Smolin, arxiv:hep-th/arXiv: 1103.5626
• The principle of relative locality, Giovanni Amelino-Camelia, Laurent Freidel, Jerzy Kowalski-Glikman, Lee Smolin, arxiv:hep-th/arXiv: 1101.0931
• Valentin Bonzom, Laurent Freidel, The Hamiltonian constraint in 3d Riemannian loop quantum arXiv: 1101.3524
• From twistors to twisted geometries, Laurent Freidel, Simone Speziale, arXiv: 1006.0199
• Linearized dynamics from the 4-simplex Regge action, Bianca Dittrich, Laurent Freidel, Simone Speziale, arXiv: 0707.4513
• Hidden Quantum Gravity in 3d Feynman diagrams, Aristide Baratin, Laurent Freidel, arxiv:gr-qc/604016
• 3d Quantum Gravity and Effective Non-Commutative Quantum Field Theory, Laurent Freidel, Etera R. Livine, arxiv:hep-th/512113
• A group field theory for 3d quantum gravity coupled to a scalar field, Laurent Freidel, Daniele Oriti, James Ryan, arxiv:gr-qc/506067
• Ponzano-Regge model revisited III: Feynman diagrams and Effective field theory, Laurent Freidel, Etera R. Livine (PI), arxiv:hep-th/502106
• Quantum gravity in terms of topological observables, Laurent Freidel, Artem Starodubtsev, arxiv:hep-th/501191
• Ponzano-Regge model revisited II: Equivalence with Chern-Simons, Laurent Freidel, David Louapre, arxiv:gr-qc/410141
• Asymptotics of 6j and 10j symbols, Laurent Freidel (PI), David Louapre (ENS-Lyon), arxiv:hep-th/209134
• Enrique F. Borja, Jacobo Diaz-Polo, Laurent Freidel, Inaki Garay, Etera R. Livine. New tools for Loop Quantum Gravity with applications to a simple model AIP Conf.Proc. 1458 (2011) 339-342, arXiv: 1201.5470.
• Three-dimensional spin foam quantum gravity. L. Freidel Mar 2009. Published in In *Oriti, D. (ed.): Approaches to quantum gravity

## Seminars

• The geometry of relative Locality'', CERN-CKC TH Institute on Duality Symmetries in String and M-Theories, Cern Switzerland.
• "The geometry of relative Locality'', Loops 15 Conference, Erlangen.
• The geometry of relative Locality'', Quantum gravity meeting, La sapienza Rome.
• The geometry of relative Locality'', GR100inRio, Rio de janeiro Brasil.
• Metastring theory and Modular spacetime'', Superstring perturbation theory Workshop, Perimeter institute. Pirsa: 15040169.
• Non-Equilibrium Thermodynamics of a Gravitational Screen'', Non equilibrium physics day, Perimeter institute, Pirsa: 14100110.
• "Gravitising the quantum: The relative Locality of string theory", Rome, Conceptual and technical challenges for quantum gravity, La sapienza, Rome.
• The geometry Of quantum Gravity, Lake como Gravity and the Quantum, Sigrav school, June 20 2014.
• Gravity and Non equilibrium Thermodynamics, University of Notthingham Seminar series, May 6, 2014.
• Gravity and non equilibrium thermodynamics'', invited Colloquium, Virginia-tech University, Virginia, USA.
• Gravitational energy and non equilibrium thermodynamics'', gravity seminar, Luminy Marseille, France.
• New spin foam models for quantum gravity'', invited colloquium,Yukawa institute, Kyoto, Japan.
• The principle of Relative Locality'' at Quantum theory and Gravitation conference, ETH Zurich, Switzerland.
• "The principle of relative locality" International Loop Quantum Gravity Seminar,
• "The principle of Relative Locality", Workshop and School on Higher Gauge Theory, TQFT and Quantum Gravity, Lisbon
• "Spin foam model for quantum gravity I, II, III. Series of lectures given at the school for quantum gravity in Morelia, Mexico.
• "twisted geometry, a geometrical description of spin networks" Talk given at the GR18 Conference in Mexico city Mexico
• "Localisation in Relative locality", Loops 11, Madrid Spain
• "Spin Foam models: models of quantum dynamical space time" 12th Marcel Grossman meeting, Keynote speaker, July 12-18, Paris, France.
• "Spin Foam models: models of quantum dynamical space time" , Max Born symposium, Invited speaker, in Wroclaw, Poland.
• "Quantum Geometry from Spin Foam",Abhay Fest'' conference, 04-06 June, Penn state State college PA, US.
• "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
• " Recovering low energy physics: A Discussion", International Loop quantum gravity seminar, May 5. http://relativity.phys.lsu.edu/ilqgs/schedulesp09.html
• "A quantum gravity perspective on AdS-CFT", conference of the European science foundation Loops and Foams'', Invited speaker, March 3-9, 2008, Zakopane, Poland.
• "Lectures on Quantum gravity", Invited speaker to the workshop "O Verao Quantico" 15 -20 february, Vitoria, Brasil.
• "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
• "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
• "Non commutative effective field theory from quantum gravity", Second Workshop on Quantum Gravity and Noncommutative Geometry, Universidade LusOfona, Lisbon 22-24 September 2008
• "Non commutative effective field theory from quantum gravity", "Noncommutative deformations of special relativity workshop in Edinburgh, Invited speaker, 7-11 July 2008.
• "Non commutative effective field theory from quantum gravity", 13th Peyresc meeting, Peyresc, France
• "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
• "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.
• " Quantum gravity perspective on AdS/CFT", International Loop quantum gravity seminar, April 8 Perimeter Institute
• "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.
• "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.
• "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
• "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
• PIRSA:14050127, What About Gravitizing Quantum Mechanics?, 2014-05-22, Quantum Gravity Day 2014
• "Double RG in 2 D and non local space-time physics" Renormalization Group Approaches to Quantum Gravity, (conference at PI)
• PIRSA:14020144, Non equilibrium thermodynamic of gravitational screens, 2014-02-19, Colloquium
• PIRSA:13070042, Black Holes - 1, 2013-07-22, Loops 13
• PIRSA:12100082, Is there a MesoScale in Quantum Gravity? Is it a Non-Locality Scale?, 2012-10-22, Experimental Search for Quantum Gravity 2012
• PIRSA:11090135, P.I. Chats: Faster-than-light neutrinos?, 2011-09-28, Black Hole Science Cafes
• PIRSA:11090119, Research Presentation - Quantum Gravity, 2011-09-15, Quantum Gravity
• PIRSA:11090052, Researcher Presentation: Laurent Freidel, 2011-09-07, 11/12 PSI - Researcher Presentations
• PIRSA:11030080, The principle of relative locality, 2011-03-01, International Loop Quantum Gravity Seminar
• PIRSA:08040027, Quantum gravity perspective on AdS/CFT, 2008-04-08, International Loop Quantum Gravity Seminar
• PIRSA:07110007, 3d ADS/CFT from a quantum gravity point of view., 2007-11-13, String Seminars
• PIRSA:07070006, The many faces of Lambda, 2007-07-26, Quantum Gravity
• PIRSA:07050087, Matter coupling to 3d quantum gravity and EFT II, 2007-05-22, International Loop Quantum Gravity Seminar
• PIRSA:07050086, Matter coupling to 3d quantum gravity and EFT , 2007-05-15, International Loop Quantum Gravity Seminar
• PIRSA:05060057, Audience Night, 2005-06-01, Perimeter Institute Public Lecture Series
• PIRSA:04100038, Symmetry and Particles in 3D Quantum Gravity, 2004-10-30, Workshop on Quantum Gravity in the Americas: Status and future directions - 2004