Deadline / Posted PhD position in Mathematical Relativity, Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland Center for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland, Poland PhD/doctoral Aug 07, 2026 posted: Jul 19, 2026 PhD Position in Geometry Friedrich-Schiller-Universität jena, Germany Institute of Mathematics PhD/doctoral Jul 31, 2026 posted: Jul 02, 2026