Effective Approximation and Dynamics of Many-Body Quantum Systems

ANR-22-CE92-0013, DFG PE 3245/3-1 and BA 1477/15-1

The French-German joint project “Effective Approximation and Dynamics of Many-Body Quantum Systems” aims at various important open questions in mathematical physics and partial differential equations (PDE). More specifically, we address the mathematical relations between the PDE describing a many-body quantum system at a microscopic level and effective approximations to this description at a macroscopic level.

The three major foci are:

This project is a joint cooperation of researchers in Braunschweig (Germany), Bremen (Germany), Metz (France), and Rennes (France).


  • A PhD position at Technische Universität Braunschweig - Braunschweig, Germany Filled: Matthias Herdzik
  • 2 years postdoctoral fellowship at Jacobs University - Bremen, Germany Filled: Shahnaz Farhat
  • 1+1 years postdoctoral fellowship at Université de Lorraine - Metz, France Filled: Viviana Grasselli
  • 1+1 years postdoctoral fellowship at Université de Rennes 1 - Rennes, France Filled: Andrew Rout


Kick-Off Meeting

Summer school


  • Bremen, 2025-2026, forthcoming


  • Forthcoming


  • Forthcoming







Sébastien Breteaux

Sébastien Breteaux

Coordinator for France

PI at University of Lorraine

Soeren Petrat

Sören Petrat

Coordinator for Germany

PI at Jacobs University Bremen

Zied Ammari

Zied Ammari

PI at University of Rennes 1

Volker Bach

Volker Bach

PI at TU Braunschweig

Jérémy Faupin

Jérémy Faupin

PI at University of Lorraine

Postdoc Bremen

Shahnaz Farhat

Postdoctoral Fellow at Constructor University

Postdoc Lorraine

Viviana Grasselli

Postdoctoral Fellow at University of Lorraine

Postdoc Rennes

Andrew Rout

Postdoctoral Fellow at University of Rennes

Matthias Herdzik

Matthias Herdzik

PhD student at TU University of Braunschweig


The project Effective Approximation and Dynamics of Many-Body Quantum Systems is cofunded by

  • the french ANR - Agence Nationale de la Recherche, project ANR-22-CE92-0013 and
  • the german DFG - Deutsche Forschungsgemeinschaft, projects PE 3245/3-1 and BA 1477/15-1
for a total amount over half a million euros.


Gender equality is an important issue which we specifically address in the project. A phenomenon observed in academia is that the fraction of female scientists is getting progressively smaller the higher the level of qualification under consideration is. This decrease is observed when comparing the fraction of female undergraduate students to the fraction of female predoctoral students, but is even more visible when comparing the predoctoral students group to the group of postdoctoral research fellows. Consequently, in the group of young postdocs from which the next generation of university faculty is recruited, the fraction of female scientists is still very low and is not going to yield the long desired gender balance for professors and faculty—especially, not in the fields of mathematics, natural and engineering sciences.

To improve on this situation we not only welcome female applications to hire, but specifically search for female applicants.

The female scientists hired by the network will receive support specifically taylored for their needs. In Germany at TU Braunschweig, the group of young female postdoctoral researchers has been the target of several measures to improve on the unbalanced situation described above, see the Equal Opportunity Office Website

  • For example, the FEMnet programme organizes need-based workshops, offers information, and provides career-supporting network events for female students with a special focus on STEM disciplines: mathematics, natural and engineering sciences.
  • This is complemented by the FEMentoring programme, a mentoring programme for female doctoral students, female postdocs, and female assistant professors (Juniorprofessorinnen). To these women FEMentoring offers a network to help planning and taking the next carreer step—for both a future carreer continuing in academia and a future carreer in commercial business.
  • Moreover, young families with children and single mothers are in the focus of supporting mea- sures such as child daycare places on campus, flexible emergency daycare at home (e.g., when a child is sick), and holiday play schemes.

We consider these measures to constitute best-practise examples, and we plan to initiate a transfer to the other participants of the project, so that our research project not only helps the young female scientists it hires during the funding period but makes a sustaining contribution at the host institutions of the project to foster the gender balance, in general.