Aspects of Nonlinear Evolution

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Conference in Honor of the 60th Birthday of Joachim Escher, May 31 - June 2, 2023


  • Wolfgang Arendt (Ulm)
  • Christian Bär (Potsdam)
  • Dieter Bothe (Darmstadt)
  • Adrian Constantin (Wien)
  • Mats Ehrnström (Trondheim)
  • Harald Garcke (Regensburg)
  • Patrick Guidotti (Irvine)
  • David Henry (Cork)
  • Matthias Hieber (Darmstadt)
  • Rossen Ivanov (Dublin)
  • Boris Kolev (Paris)
  • Calin Martin (Wien)
  • Anca Matioc (Regensburg)
  • Bogdan Matioc (Regensburg)
  • Wolfgang Reichel (Karlsruhe)
  • Jörg Seiler (Torino)
  • Gieri Simonett (Nashville)
  • Erik Wahlen (Lund)
  • Emil Wiedemann (Erlangen)
  • Michael Winkler (Paderborn)


The workshop will start at 9 am on May 31 and end approximately at 5 pm on June 2.

A special colloquium will be held in the afternoon of June 1, starting at 2pm, with scientific talks by Adrian Constantin (Wien) and Matthias Hieber (Darmstadt). The colloquium will be followed by a reception.


Wednesday,  May 31

9:00 - 9.45 Registration 
09.50 - 10.35 W. Arendt. From forms to non-linear semigroups
10.40 - 11.10 Tea and Coffee
11.10 - 11.55 M. Ehrnström.  On two new constructions of solitary waves of the nonlinear and nonlocally dispersive Whitham equation
12.00 - 12.45 E. Wahlén. Large amplitude steady water waves with vorticity
12.45 - 14.15 Lunch Break
14.15 - 15.00 E. Wiedemann. Some remarks on the viscosity limit problem
15.05 - 15.50 C. Martin. Liouville-type results for the time-dependent three-dimensional water wave problem with an interface
15.50 - 16.20 Tea and Coffee
16.20 - 17.05 A. Matioc. A new reformulation of the Muskat problem with surface tension
17.10 - 17.55 M. Winkler.  The role of cross-degeneracies in reaction-diffusion driven structure evolution


Thursday, June 1

9:00 - 9.45 H. Garcke.  On the interaction of mean curvature flow and diffusion on evolving hypersurfaces
09.50 - 10.35 D. Henry. Energy considerations for nonlinear water waves in the Equatorial f-plane
10.40 - 11.10 Tea and Coffee
11.10 - 11.55 B. Matioc.  The nonlocal mean curvature flow of periodic graphs
12.00 - 12.45 B. Kolev. The Euler-Arnold equation on the diffeomorphism group
12.45 - 14.15 Lunch Break

Special Colloquium in Honor of Joachim Escher's 60th Birthday

14.15 - 14.45 Welcoming Addresses by the President, Prof. Dr. V. Epping, and the Dean, Prof. Dr. A. Heisterkamp
14.45 - 15.45 M. Hieber. A journey through the world of Incompressible fluids and geophysical flows
15.45 - 16.15  Tea and Coffee
16.15 - 17.15 A. Constantin.  The evolution in time of extrema
17.15 - 18.15 Reception
19.30 Conference Dinner in the 'Gartensaal' of Neues Rathaus


Friday, June 2

9:00 - 9.45 W. Reichel. Time-periodic waves for a quasilinear wave equations based on a Kerr-nonlinear Maxwell model 
09.50 - 10.35 R. Ivanov. Equatorial internal waves
10.40 - 11.10 Tea and Coffee
11.10 - 11.55 P. Guidotti. The curve shortening flow for immersed curves
12.00 - 12.45 J. Seiler. Boundary value problems with rough boundary data
12.45 - 14.15 Lunch Break
14.15 - 15.00 G. Simonett. Fluid flow on surfaces
15.05 - 15.50 C. Bär. Counterintuitive approximations


Download the Book of Abstracts here

Venue Workshop

The workshop and the colloquium will be held in lecture hall F303 in the main building of Leibniz University.  Click here for the location of the main building and here for the location of the lecture hall within the building. 

The street address is Welfengarten 1, 30167 Hannover, Germany. 

To Get There

From the Railway Station Hannover Hauptbahnhof: Leave the train station through the main entrance at “Ernst August Platz”. Walk (orthogonal to the station) about 400m into the city to the subway-station “Kröpcke”. Enter the station. Take the escalator at the very left to go all the way down to the lowest floor. There take the subway 4 (direction “Garbsen”) or the subway 5 (direction “Stöcken”). “Leibniz Universität” is the third stop, after “Steintor” and “Königsworther Platz”.

If you have a train ticket marked “+City” then you will not need to buy a ticket for the subway. Otherwise it is enough to buy a short trip ticket (“Kurzstrecke”, presently 1.70€). 

The subway stops right across from the main building (Welfenschloss) of the university. Enter through the main entrance between the two lions.  Go straight through the hall and take the stairs upstairs. Enter the corridor on the left. The lecture hall is at the end.

Alternatively, a taxi from the railway station will be about 15€. 

From Hannover Airport (HAJ).  Go to the S-Bahn station below Terminal C. Purchase a ticket 'Einzelticket AB'. The price is 4.00€. Take the S-Bahn to Hannover Hauptbahnhof. Then follow the instructions above. The ticket is good for both trips, from the airport to Hannover Hauptbahnhof and from Kröpcke to the University.

Alternatively, a taxi will cost you about 45€.  

In case you plan to have more trips in the city: A ticket that is valid all day on all trains, trams and buses in Tariff Area AB is  "Tageskarte (AB)" for presently 8.00€.  For more information and an option to buy tickets online see 

Venue Conference Dinner

The Conference Dinner will take place at the Garden Hall (Gartensaal) of the New City Hall (Neues Rathaus) in Hannover. The street address is
Neues Rathaus, Trammplatz 2, 30159 Hannover

To get there. Walking there from the University will take about 30 min. 
Alternatively, take the street car from the stop 'Leibniz Universität' in direction 'Anderten' or 'Roderbruch' and exit at the stop 'Ägidientorplatz'. From there it is a  10 min walk to the New City Hall. Instead of walking this last distance, you can take Bus 120 from 'Agidientorplatz' to 'Rathaus/Friedrichswall' which is right across the street from the New City Hall.


Download the Conference Poster here. Design: Karin Frey, Leibniz University Hannover



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Wolfram Bauer  —  Johannes Lankeit  —  Elmar Schrohe — Christoph Walker