There will be nine 4 year PhD position available at the University of Groningen.
Although the research projects are interdisciplinary and across mathematics, physics and astrophysics, at least two of the research topics (number 6 and 9 in the topics list) have a strong mathematical component, with focus on dynamical systems, hamiltonian mechanics and semiclassical analysis.
The advertisement is available at the following link: https://www.rug.nl/education/phd-programmes/phd-scholarship-programme/phd-scholarships?details=00347-02S0007L1P
The deadline for the application is 1 April 11:59 pm / before 2 April Dutch local time. All the activities at the University of Groningen are in English, no knowledge of the Dutch language is required or expected.