
I am a Wallenberg Scholar and supported by the Swedish Research Council.
Prior to returning to KTH, I was a Simons Fellow and Ritt Assistant Professor at Columbia University and then an associate professor at Uppsala University.
I am currently the director of the Master's Programme in Mathematics at KTH.
Editorial work: Arkiv för Matematik and Analysis and Mathematical Physics.
PhD students: Ellen Krusell, Vlad Guskov, Felix Rydell (with K. Kohn), Lukas Schoug (PhD 2019, now in Helsinki). Postdocs: Erik Duse, Mingchang Liu (starting summer '23), Malin Palö Forsström (now at Chalmers), Atul Shekhar (now at U. Lyon 1).
News
I'm coorganizing the KTH Probability and Mathematical Physics Seminar.
Postdoc positions available. (Write to me if you are interested.)
Jeju Island Workshop 2023 (now resurrected!): Random conformal geometry and related fields in Jeju
MSRI Semester, Spring 2022: The Analysis and Geometry of Random Spaces.
Quantum Fields and Probability, Institut Mittag-Leffler, August 8-12, 2022.
Random growth: from lichen to lightning. Joint work with A. Sola and A. Turner made the cover of the London Mathematical Society Newsletter.




Research interests
My main areas of interest are in complex analysis, probability, and mathematical physics. Particular topics that I work on include the geometry of Schramm-Loewner evolution (SLE) curves; critical lattice models; lattice gauge theory; random walks; Laplacian growth and aggregation models; analytic and probabilistic aspects of conformal field theory; the Loewner equation; the Loewner energy/Weil-Petersson quasicircles and related parts of analysis. I am also interested in computer science and some aspects of applied mathematics. Pictures: A level line in a discrete Gaussian Free Field (courtesy of N.-G. Kang); a regularized Hastings-Levitov cluster with alpha=2; a loop-erased random walk derived from a 50k step simple random walk; a foliation of the unit disc generated by a measure with finite Loewner-Kufarev energy.
Papers
- Free energy and quark potential in Ising lattice gauge theory via cluster expansion
With M. P. Forsström
[arXiv] - Wilson lines in the lattice Higgs model at strong coupling
With M. P. Forsström, J. Lenells
[arXiv] - Percolation for two-dimensional excursion clouds and the discrete Gaussian free field
With A. Drewitz, O. Elias, A. Prevost, J. Tykesson
[arXiv] - Wilson loops in the abelian lattice Higgs model
With M. P. Forsström, J. Lenells
Forthcoming in Probability and Mathematical Physics (PMP)
[arXiv] - The Loewner-Kufarev Energy and Foliations by Weil-Petersson Quasicircles
With Y. Wang
[arXiv] - Wilson loops in finite Abelian lattice gauge theories
With M. P. Forsström, J. Lenells
Forthcoming in Ann. Inst. Henri Poincaré
[arXiv] - Conformal Field Theory at the Lattice Level: Discrete Complex Analysis and Virasoro Structure
With C. Hongler, K. Kytola.
Comm. Math. Phys. 395 1--58 (2022)
[arXiv] [Journal]
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Convergence of loop-erased random walk in the natural parametrization
With G. F. Lawler.
Duke Math. J. 170 (10) (2021)
[arXiv] [Journal] The Loewner difference equation and convergence of loop-erased random walk
With G. F. Lawler.
ALEA19 (2022)
[Journal]
- Dimensions of two-valued sets via imaginary chaos
With L. Schoug, A. Sepulveda
Int. Math. Res. Not. (IMRN) 2022 (5) (2022)
[arXiv] [Journal] - Remarks on the regularity of quasislits
With L. Schoug, A. Shekhar
Ann. Acad. Sci. Fenn. Math 46 (1) (2021)
[arXiv] [Journal] - Interplay between Loewner and Dirichlet energies via conformal welding and flow-lines
With Y. Wang
Geom. Funct. Anal. (GAFA) 30 289–321 (2020)
[arXiv] [Journal] - Asymptotic analysis of Dotsenko-Fateev integrals
With J. Lenells
Ann. Henri Poincaré 20 (11) 3799-3848 (2019)
[arXiv] [Journal] - Schramm's formula and the Green's function for multiple SLE
With J. Lenells
J. Stat. Phys. 176 (4) 873–931 (2019)
[arXiv] - Transition probabilities for infinite two-sided loop-erased random walks
With C. Benes, G. F. Lawler. Electron. J. Probab. 24 Paper no 139, 22p (2019).
[arXiv] - One-dimensional scaling limits in a planar Laplacian random growth model
With A. Sola, A. Turner. Comm. Math. Phys. 371 (1) (2019)
[arXiv] [Journal] - Convergence of radial loop-erased random walk in the natural parametrization
With G. F. Lawler
[arXiv]
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A dimension spectrum for SLE boundary collisions
With T. Alberts, I. Binder.
Comm. Math. Phys 348 (1) 273–298, (2016)
[arXiv]
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Scaling limit of the loop-erased random walk Green's function
With C. Benes, G. F. Lawler.
Probab. Theory. Related Fields, 166 (1-2), 271–319 (2016)
[arXiv]
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Small particle limits in a regularized Laplacian random growth model
With A. Sola, A. Turner.
Comm. Math. Phys. 334 (1), 331-366, (2015)
[arXiv] [Simulations]
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Convergence rates for loop-erased random walk and other Loewner curves
Ann. Probab. 43 (1), 119-165 (2015)
[arXiv]
On the continuity of SLE(k) in k
With S. Rohde, C. Wong.
Probab. Theory Related Fields 159 (3), 413-433 (2014)
[arXiv]
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Some remarks on SLE bubbles and Schramm's two-point observable
With D. Beliaev.
Comm. Math. Phys. 320 (2), 379-394 (2013)
[arXiv]
- Almost sure multifractal spectrum for the tip of an
SLE curve
With G. F. Lawler.
Acta Math. 209, 265-322 (2012)
[arXiv]
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On the rate of convergence of loop-erased random walk to SLE(2)
With C. Benes and M. Kozdron.
Comm. Math. Phys. 308 (2), 307-354 (2013)
[arXiv]
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Optimal Holder exponent for the SLE path
With G. F. Lawler.
Duke Math. J. 159 (3), 351-383 (2011)
[Journal] [arXiv]
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Scaling limits of anisotropic Hastings-Levitov clusters
With A. Sola and A. Turner.
Ann. Inst. Henri Poincaré 48, 235-257 (2012)
[Journal] [arXiv]
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On the scaling limit of loop-erased random walk excursion
Ark. Mat. 50 (2) (2012)
[Journal]
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Random Loewner Chains
Doctoral Thesis from KTH Royal Institute of Technology, April 2010.
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Rescaled Levy-Loewner hulls and random growth
With A. Sola.
Bull. Sci. Math. 133, 238-256 (2009)
[Journal] [arXiv]
Local activities
Informal summer school 2020: Grunsky operators, Fuchsian equations, inverse limits
Graduate course on geometric function theory, Fall 2020.
Selected topics in analysis: lattice models and random walk (new master's course), SF2716, Spring 2021.
Advanced complex analysis, SF2745 (new master's course), Spring 2020
KTH Probability Seminar (Since Spring 2023 merged with the Random Matrix Theory Seminar to form the Probability and Mathematical Physics Seminar.)
I was involved in a study group on Mathematics for Complex Data, Brummer & Partners MathDataLab.
Graduate course on Geometric Function Theory, Spring 2018.
Past events
Upcoming: MSRI Graduate Summer School, July 2021: Random Conformal Geometry.
Invited Session, SPA 2019, July 8-12, Evanston, IL, USA.
The analysis of Random Shapes, Jan 7-11, 2019, IPAM/UCLA, Los Angeles, CA, USA.
Invited Session, SPA 2018, June 11-15, 2018, Gothenburg, Sweden.
Random Conformal Geometry and Related Field, June 18-22, 2018, KIAS, Seoul, Korea. Funded by NSF, Samsung Science and Technology Foundation.
Mini workshop on Constructive Field Theory, March 13-15, 2018, Columbia University, NYC, USA. NSF funded.
Mini workshop on Log-Correlated Random Fields, Dec. 12-14, 2017, Columbia University, NYC, USA. NSF funded.
SLE, GFF and LQG in NYC, March 13-17, 2017, Columbia University, New York City, USA. NSF funded.
Institut Mittag-Leffler Workshop: Recent Developments in SLE, June 13-17, 2016, Djursholm, Sweden. Group photo.
One-day conference: Stockholm-Uppsala Analysis and Probability Day 2015, November 26, 2015, Uppsala, Sweden.
ICM Satellite meeting: Recent Progress in Random Conformal Geometry, August 11-12, Seoul, Korea.
One-day conference: Stockholm-Uppsala Analysis and Probability Day 2014, September 19, Stockholm, Sweden.
Travel
- June 10-21, 2019, Probability and quantum field theory, Porquerolles, France
- May 21-24, 2019, ETH Zurich
- Feb 2019, Workshop on statistical mechanics, Les Diablerets, Switzerland.
- Jan 7-12, 2019, Analysis and geometry of Random Shapes, IPAM workshop, UCLA, USA.
- March 12-17, 2018, Mini-workshop on Constructive Field Theory, Columbia University, New York, USA
- February 11-16, 2018, Topics in Geometric Function Theory, Les Diablerets, Switzerland
- January 18, 2018, Chalmers, Gothenburg
- December 10-16, 2017, Columbia University, NYC
- Nov 10-13, 2017, University of Bristol, University of Bath
- April 24, 2017, University of Geneva.
- March 19-21, 2017, MIT, Cambridge
- March 12-18, 2017, Columbia University, NYC
- January 24-25, 2017, IRS, Paris.
- December 14, 2016, Lund University.
- Oct 17-Nov 16, 2016, Columbia University.
- March 6-13, 2016, Everything is Complex, Saas Fee, Switzerland.
- April 4-8, 2016: UK Easter Probability Meeting. (Universtity of Lancaster.)