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- Wolfgang Wieland

Space, time and causality are like a vast ordering structure for our observations. In Newtonian gravity, matter fills this structure according to the dynamical laws, but the structure itself stays rigid. General relativity unfreezed this rigidity: gravity bends spacetime, and the causal structure becomes itself dynamical. Quantum theory, on the other hand, has taught us that nature is intrinsically probabilistic -- the Heisenberg uncertainty principle sets a fundamental limit to how much we can now about a quantum system. The main theme of my research program is to bring these lessons together -- my goal is to understand the causal structure of spacetime once both quantum theory and general relativity become equally important. On a more technical level, the goal is to quantise the light cone structure of spacetime and treat the causal structure of spacetime as a quantum system itself.

My main research interests are:

- Quantum gravity

- Loop quantum gravity and spinfoam models

- Spin structure of spacetime

- Quasi-local observables/quasi-local realisations of the holographic principle

- 2018--2020, Senior Postdoctoral Fellow at Perimeter Institute.
- 2015--2018, Postdoctoral fellow at Perimeter Institute.
- 2013--2015, Postdoctoral scholar at the Institute for Gravitation and the Cosmos (Pennsylvania State University, United States)

- Bronstein Prize in Loop Quantum Gravity (2019)
- Prix de thèse, Aix-Marseille Université (2014)

- W. Wieland, Twistor representation of Jackiw-Teitelboim gravity,
accepted for publication in Class. Quant. Grav. (2020), arXiv: 2003.13887. - Jeevan Chandra Namburi, W. Wieland, Deformed Heisenberg charges in three-dimensional gravity,

JHEP 2003 (2020) 175, arXiv: 1912.09514. - M. Dupuis, F. Girelli, A. Osumanu and W. Wieland, First-order formulation of teleparallel gravity and dual loop gravity,

Class. Quantum Grav. 37 (2020) 085023, arXiv: 1906.02801. - W. Wieland, Generating functional for gravitational null initial data,

Class. Quant. Grav. 36 (2019), 235007, arXiv: 1905.06357. - W. Wieland, Conformal boundary conditions, loop gravity and the continuum,

JHEP (2018) 2018: 89, arXiv: 1804.08643. - E. Adjei, S. Gielen, W. Wieland, Cosmological evolution as squeezing: a toy model for group field cosmology,

Class. Quantum Grav. 35 (2018), 105016, arXiv: 1712.07266. - W. Wieland, Quantum gravity in three dimensions, Witten spinors and the quantisation of length,

Nuclear Physics B 930 (2018), 219-234, arXiv: 1711.01276. - W. Wieland, New boundary variables for classical and quantum gravity on a null surface,

Class. Quantum Grav. 34 (2017), 215008 (30pp), arXiv: 1704.07391. - W. Wieland, Fock Representation of Gravitational Boundary Modes and the Discreteness of the Area Spectrum,

Ann. Henri Poincaré 18 (2017), 3695, arXiv: 1706.00479. - W. Wieland, Discrete gravity as a topological field theory with light-like curvature defects,

JHEP 5 (2017), 142, arXiv: 1611.02784. - W. Wieland, Quasi-local gravitational angular momentum and centre of mass from generalised Witten equations,

Gen. Rel. Grav. 49 (2017), 38, arXiv: 1604.07428. - W. Wieland, New action for simplicial gravity in four dimensions,

Class. Quant. Grav. 32 (2015), 015016, arXiv: 1407.0025. - W. Wieland, A one-dimensional action for simplicial gravity in three dimensions,

Phys. Rev. D 90 (2014), 044008, arXiv: 1402.6708. - W. Wieland, Hamiltonian spinfoam gravity,

Class. Quant. Grav. 31 (2014), 025002, arXiv: 1301.5859. - E. Bianchi, M. Han, E. Magliaro, C. Perini, C. Rovelli, W. Wieland, Spinfoam fermions,

Class. Quant. Grav. 30 (2013), 235023, arXiv: 1012.4719. - H. M. Haggard, C. Rovelli, F. Vidotto, W. Wieland, The spin connection of twisted geometry,

Phys. Rev. D 87 (2013), 024038, arXiv: 1211.2166. - S. Speziale, W. Wieland, The twistorial structure of loop-gravity transition amplitudes,

Phys. Rev. D. 86 (2012), 124023, arXiv: 1207.6348. - W. Wieland, Twistorial phase space for complex Ashtekar variables,

Class. Quant. Grav. 29 (2012), 045007, arXiv: 1107.5002. - W. Wieland, Complex Ashtekar variables and reality conditions for Holst's action,

Annales Henri Poincaré 12 (2012), 425, arXiv: 1012.1738. - E. Bianchi, W. Wieland, Horizon energy as the boost boundary term in general relativity and loop gravity, arXiv: 1205.5325.
- W. Wieland, Complex Ashtekar variables, the Kodama state and spinfoam gravity, arXiv: 1105.2330.

- Quantum Gravity 2020 (Perimeter Institute, Canada), panel discussion: on
Black Holes, Topology Change, and Thermality with Herman Verlinde (Princeton, USA), Clifford Johnson (University of Southern California, USA), and Hal Haggard (Bard College, USA). - Lecture on Quantum Gravity at the Austrian Particle Physics Retreat (FAKT Workshop 2020, Semmering, Austria).
- Twistors Meet Loops Conference at Centre International de Rencontres Mathématiques (CIRM, Marseille, France),
Sparling three-form and loop gravity edge modes , 2019-09-03. - LOOPS'19, Pennsylvania State University (StateCollege, Pennsylvania, U.S.A.), invited plenary talk on
Boundaries in loop quantum gravity. 2019-06-19. - Peyresq Physics 23: Micro and Macro Structure of Spacetime (Peyresq, France),
Loop quantum gravity and the continuum, 2018-06-11, - APS April Meeting 2018 (Columbus, Ohio),
Loop Quantum Gravity and the Quantization of Null Surfaces , 2017-07-05,slides . New boundary variables for Classical and Quantum Gravity on a null surface , Seminar at IQOQI (Vienna, Austria), 2017-07-25.- Loops'17 (Warsaw, Poland),
New boundary variables for classical and quantum gravity , 2017-07-05,slides . Spinors as boundary variables for gravity on a null surface , Seminar of the Gravitational Physics Group at the University of Vienna, 2017-03-01.Four Lectures on non-perturbative quantum gravity , Lectures held at the Institute for Theoretical Physics at the University of Innsbruck, February 2017.Spinors as boundary variables for gravity on a null surface , Seminar given at the Centre de Physique Théorique (Marseille, France), 2017-02-21.- Fifth Tux winter workshop on Quantum Gravity (Tux, Austria),
Spinors as boundary variables for gravity on a null surface , 2017-02-21. Discrete Gravity as a topological field theory with defects , Seminar given at Louisiana State University (Baton Rouge, USA), November 2016.Quasilocal free energy: Positivity and monotonicity , Seminar given at Caltech, October 2016.- PIRSA:19030081, PSI 2018/2019 - Explorations in Quantum Gravity - Lecture 14, 2019-03-21, PSI 2018/2019 - Explorations in Quantum Gravity (Dupuis)
- PIRSA:15090076, TBA, 2015-09-28, Renormalization in Background Independent Theories: Foundations and Techniques
- PIRSA:14110116, Worldline formalism for covariant loop gravity, 2014-11-06, Quantum Gravity
- PIRSA:14030088, A one-dimensional action for simplicial gravity in three dimensions, 2014-03-06, Quantum Gravity
- PIRSA:13070045, Spin Foams - 2, 2013-07-22, Loops 13
- PIRSA:12020129, Spinor Quantisation for Complex Ashtekar Variables, 2012-02-29, Quantum Gravity

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