Moritz S. Fischer
Moritz S. Fischer

Astrophysicist

Postdoc

Moritz S. Fischer

Astrophysicist

Postdoc

About Me

I'm a postdoc in the CAST group at the University Observatory Munich and part of the excellence cluster Origins. My research interests are astrophysics on galactic-scales and models beyond ΛCDM. I prefer to work numerically, including all the way from new ideas for numerical schemes to the analysis of simulation data.

My research focuses on simulations and the phenomenology of dark matter with non-gravitational self-interactions as well as dark matter-baryon scattering. I employ N-body simulations to study how such interactions can alter the distribution of dark matter and baryons. In particular, I have developed a numerical scheme that allowed – for the first time – to simulate very anisotropic cross-sections motivated by merging galaxy clusters. Moreover, I wrote the first N-body simulation paper on dark matter-baryon interactions employing a novel scheme that I had developed. For more details, see my publications and the Darkium webpage.

My Research Interests
Dark Matter and Cosmology
Simulation Code Development
Galaxy Formation and Evolution
Numerical Methods
Resume
Academic positions
2022 - present
Postdoctoral Researcher
Ludwig Maximilian University of Munich

I am a postdoc in the CAST group with Prof. K. Dolag, working on simulations of dark matter interacting with itself and baryons.

Education
2019 - 2022
PhD Student
University Hamburg

I did my doctorate on simulations of self-interacting dark matter at the Hamburg Observatory and was part of the excellence cluster Quantum Universe. Supervisors: Prof. M. Brüggen and Dr. K. Schmidt-Hoberg.

2017-2018
Master in Physics
University Heidelberg

Master thesis with Dr. A. Pillepich at the Max Planck Institute for Astronomy in Heidelberg.

2013 - 2017
Bachelor in Physics
University Heidelberg

Bachelor thesis with Prof. H. Klahr at the Max Planck Institute for Astronomy in Heidelberg.

My Skills
Coding
  • C++
    14.4 yrs
  • Python
    7.7 yrs
Languages
  • English
  • German
All Publications

Find them on orcid or ads or inspire or arXiv.

Selected First Author Publications
Accurately simulating core-collapse self-interacting dark matter halos
N-body simulations of dark matter-baryon interactions
Dynamical friction from self-interacting dark matter
Numerical challenges for energy conservation in N-body simulations of collapsing self-interacting dark matter halos
Cosmological and idealised simulations of dark matter haloes with velocity-dependent, rare and frequent self-interactions
The role of baryons in self-interacting dark matter mergers
Sensitivity of halo shape measurements
Cosmological simulations with rare and frequent dark matter self-interactions
Unequal-mass mergers of dark matter haloes with rare and frequent self-interactions
N-body simulations of dark matter with frequent self-interactions
PhD Thesis
Simulations of Dark Matter with Frequent and Rare Self-Interactions
Main Collaborators
Marcus Brüggen
Klaus Dolag
Mathias Garny
Felix Kahlhoefer
Antonio Ragagnin
Andrew Robertson
Laura Sagunski
Kai Schmidt-Hoberg
Hai-Bo Yu
(Co-)Supervised Students
Cenanda Arido

Worked as a master's student on angular-dependent self-interactions

Nils-Henrik Durke
Lenard Kasselmann
David Klemmer

Works as a master's student on the evolution of self-interacting dark matter haloes

Yashraj Patil

Works as a master's student on galaxies in galaxy clusters

Marc Wiertel

Master thesis on Simulation of SIDM with angular-velocity-dependent cross sections

Interns
Claudius Hammer
Katharina Hollingshausen
Get in Touch