Dear colleagues

apologies if you receive this more than once.

As part of the University of Hamburg's Excellence Cluster "Quantum Universe" there are two open positions related to the theory/modelling of compact object mergers:

i) Postdoc "Neutron star - black hole mergers”

The specific topic is related to mergers of black holes with neutron stars and their various multi-messenger signatures including gravitational wave, electromagnetic and neutrino signals. The successful candidate possesses demonstrated expertise in the relevant areas of theoretical astrophysics (general relativity, hydrodynamics, nuclear equations of state, neutrino physics/transport, nuclear reactions and radiative transfer), in code development with compiled programming languages and in computational physics/supercomputing. Candidates with expertise in the construction of numerical relativity initial conditions are particularly encouraged to apply.

The application deadline is December 22, 2025.

For more information please contact Stephan.Rosswog@uni-hamburg.de

The application has to be submitted via the application system of the University of Hamburg, please see https://www.uni-hamburg.de/stellenangebote/ausschreibung.html?jobID=7bd2c136... for more information.

ii) PhD position "Signatures of beyond-standard-model physics in neutron star mergers"

The project will explore potential signatures of beyond standard model physics in the merger of two neutron stars. The ideal candidate has knowledge of general relativity, hydrodynamics, particle physics and computational physics with compiled programming languages.

The application deadline is December 22, 2025.

For more information please contact Stephan.Rosswog@uni-hamburg.de and/or Sam.Witte@physics.ox.ac.uk

The application has to be submitted via the application system of the University of Hamburg, please see https://www.uni-hamburg.de/stellenangebote/ausschreibung.html?jobID=7bd2c136... https://www.uni-hamburg.de/stellenangebote/ausschreibung.html?jobID=110962f7bfc27737fd7d5be6b2f31a6f9cabf358 for more information.

Best wishes Stephan

---------------------------------------------- Prof. Dr. Stephan Rosswog Computational High-Energy Astrophysics

The Oskar Klein Centre for Cosmoparticle Physics Department of Astronomy, Stockholm University AlbaNova, Roslagstullbacken 21 SE-10691 Stockholm, Sweden

Email: stephan.rosswog@astro.su.se Tel.: +46 (0)8 5537 8529 URL: http://compact-merger.astro.su.se/