Welcome

Welcome to my webpage. I am head of the Weierstrass group Energy-variational Methods for Innovative Materials at the Weierstrass Institute for Applied Analysis and Stochastics, Berlin.

My research mainly focuses on the theory of generalized solutions, their approximation, and optimal control. You can also find my ORCID profile here: 0000-0002-1677-6925.

Highlights

  • In February 2026 the new Weierstrass Group "Energy-variational Methods for Innovative Materials" was initiated.
  • Robert Lasarzik recently received his Habilitation at FU Berlin; the thesis can be found here.
  • The preprint "Probabilistically Strong Solutions to Stochastic Euler Equations", together with Benjamin Gess, can now be found on arXiv.
  • The preprint "Existence and selection of solutions in the energy-variational framework with applications in fluid dynamics", together with Thomas Eiter and Marcel Śliwiński, can be found on arXiv.
  • Giulia Cavalleri started her PostDoc in March within the Excellence Cluster MATH+.
  • Maximilian Reiter submitted his PhD Thesis and his defense is scheduled for May 12, 2026.
  • Robert Lasarzik will organize a Minisymposium at the FBP Conference together with Elisabetta Rocca and Hao Wu on Phase Field Methods in Real-World Applications.
  • On April 28, Marcel Śliwiński and Robert Lasarzik from our group together with Thomas Eiter from Group 1 defended our project proposal on "Analysis of energy-variational solutions for hyperbolic conservation laws" for the second funding period within the SPP 2410 CoScaRa at the Review Event in Mainz. This went extremely well and the project was recommended for funding by the reviewers.
  • A new article by Robert Lasarzik, together with Elisabetta Rocca and Giulio Schimperna, is now available online: Weak solutions and weak-strong uniqueness for a Cahn-Hilliard type model with chemotaxis. In this work, we establish the existence of global-in-time weak solutions and weak-strong uniqueness for a Cahn-Hilliard-Keller-Segel model. As a somewhat surprising result, we achieve global existence on general domains, something that remains unknown for the classical Keller-Segel model.

Research Interests

  • Generalized solutions to the Ericksen–Leslie model
  • Measure-valued, dissipative, entropy solutions
  • Weak-strong uniqueness of solutions
  • Liquid crystal flow
  • Relative energy approach
  • Optimal control
  • Induction hardening
  • Convergence of discretization methods
  • Energy-variational solutions
  • Phase-field models
  • Viscoelastic fluids

Publications

Projects

Teaching

  • Lectures
  • SoSe 2024: Partielle Differentialgleichungen III (in English)
  • WiSe 2023/24: Partielle Differentialgleichungen II (in English)
  • SoSe 2021: Nonlinear functional analysis and evolution equations (in English, online)
  • SoSe 2019: Nonlinear functional analysis and evolution equations (in English)
  • Seminars
  • SoSe 2024: Seminar on ordinary differential equations
  • WiSe 2023/24: Seminar on Sobolev and BV spaces
  • Exercises
  • SoSe 2024: Partielle Differentialgleichungen III (in English)
  • WiSe 2023/24: Partielle Differentialgleichungen II (in English)
  • WiSe 2016/17: Differentialgleichungen IIB
  • WiSe 2015/16: Differentialgleichungen I
  • WiSe 2014/15: Differentialgleichungen I
  • SoSe 2011: Nichtlineare Optimierung
  • Tutorials
  • WiSe 2016/17: Differentialgleichungen I
  • SoSe 2016: Differentialgleichungen für Ingenieure
  • WiSe 2015/16: Differentialgleichungen I
  • SoSe 2015: Analysis II für Mathematiker
  • WiSe 2014/15: Differentialgleichungen I
  • SoSe 2014: Analysis III für Ingenieure
  • WiSe 2013/14: Differentialgleichungen für Ingenieure
  • SoSe 2013: Mathematik für Physiker IV
  • WiSe 2010/11: Lineare Algebra für Ingenieure

Research Stays

  • 04/2018: University of Pavia, with Elisabetta Rocca and Giulio Schimperna
  • 02/2019: University of Milan, with Monica Conti, Elisabetta Rocca, and Giulio Schimperna
  • 11/2019: University of Tübingen, with Andreas Prohl
  • 10/2021: University of Ulm, with Emil Wiedemann
  • 02/2023: University of Pavia, with Elisabetta Rocca
  • 11/2024: University of Pavia, with Elisabetta Rocca and Giulio Schimperna
  • 06/2025: University of Erlangen, with Stefan Metzger

Management and Scientific Organization

  • Project manager of Mathematics and Materials Science for Steel Production and Manufacturing (MIMESIS) European Industrial Doctorate program with 8 PhD students.
  • 07/2019: Workshop on Mathematics and Materials Science for Steel Production and Manufacturing
  • 03/2022: Organization of a Minisymposium on "Generalized solvability concepts for evolutionary PDEs and properties" together with Elisabetta Rocca at SIAM PD22
  • 08/2023: Organization of a Minisymposium on "Recent Advances in the analysis and numerics of phase field methods" together with Dietmar Hömberg at ICIAM 2023 in Tokyo
  • 09/2025: Mathematical Analysis of Fluid Flows by Variational Methods, WIAS Berlin
  • Regularly involved in the invitation for and organization of seminars at WIAS, e.g. Group Seminar, Langenbach Seminar, FEniCS Seminar.

Additional Professional Activities

  • Peer recognition: Berlin Mathematical School (BMS) Phase 1 Student; Travel grant of BMS; WIAS Young Scientist Grant; PI of two third-party funded projects; Guest professor at FU Berlin; publication On the existence of weak solutions in the context of multidimensional incompressible fluid dynamics > among most read publications in M2AS of 2023; invitation to thematic semester on Free Boundary Problems in Vienna 2025.
  • Member of the WIAS Open Access and Library Commission.
  • Elected representative of the scientific staff in the Scientific Advisory Board of WIAS.
  • Promoting Open Science and Open Access publication by providing numerical implementations in open access using services such as GitHub and Zenodo.
  • Member of DMV, EMS, and GAMM activity groups.

Education and Theses

Contact

E-maillasarzik(at)wias-berlin.de
Phone+49 (0) 30 20372-466
AddressMohrenstrasse 39, 10117 Berlin
Office504
Portrait