Stefan Harfst

A multiphysics and multiscale software environment for modeling astrophysical systems (2008)

Zwart, Simon Portegies, McMillan, Steve, Harfst, Stefan, Groen, Derek, Fujii, Michiko

We present MUSE, a software framework for combining existing computational tools for different astrophysical domains into a single multiphysics, multiscale application. MUSE facilitates the coupling...

Collisionally Regenerated Dark Matter Structures in Galactic Nuclei (2006)

Merritt, David, Harfst, Stefan, Bertone, Gianfranco

We show that the presence of a rho~1/r^{3/2} dark matter overdensity can be robustly predicted at the center of any galaxy old enough to have grown a power-law density cusp in the stars via the...

Performance Analysis of Direct N-Body Algorithms on Special-Purpose Supercomputers (2006)

Harfst, Stefan, Gualandris, Alessia, Merritt, David, Spurzem, Rainer, Zwart, Simon Portegies, Berczik, Peter

Direct-summation N-body algorithms compute the gravitational interaction between stars in an exact way and have a computational complexity of O(N^2). Performance can be greatly enhanced via the use...

Performance Analysis of Direct N-Body Algorithms on Special-Purpose Supercomputers (2006)

Harfst, Stefan, Gualandris, Alessia, Merritt, David, Spurzem, Rainer, Zwart, Simon, Berczk, Peter

Direct-summation N-body algorithms compute the gravitational interaction between stars in an exact way and have a computational complexity of O(N^2). Performance can be greatly enhanced via the use...

Performance analysis of direct N-body algorithms on special-purpose supercomputers (2006)

Harfst, Stefan, Gualandris, Alessia, Merritt, David, Spurzem, Rainer, Zwart, Simon, Berczik, Peter

Direct-summation N-body algorithms compute the gravitational interaction between stars in an exact way and have a computational complexity of O(N^2). Performance can be greatly enhanced via the use...

Modelling Galaxies with a 3d Multi-Phase ISM (2005)

Harfst, Stefan, Theis, Christian, Hensler, Gerhard

We present a new particle code for modelling the evolution of galaxies. The code is based on a multi-phase description for the interstellar medium (ISM). We included star formation (SF), stellar...

Modelling galaxies with a 3D multi-phase ISM (2004)

Harfst, Stefan, Theis, Christian, Hensler, Gerhard

We present a new particle code for modelling the evolution of galaxies. The code is based on a multi-phase description for the interstellar medium (ISM). We included star formation (SF), stellar...

Modelling galaxies with a 3D multi-phase ISM (2004)

Harfst, Stefan, Theis, Christian, Hensler, Gerhard

We present a new particle code for modelling the evolution of galaxies. The code is based on a multi-phase description for the interstellar medium (ISM). We included star formation (SF), stellar...

Modelling galaxies with a 3D multi-phase ISM (2004)

Harfst, Stefan, Theis, Christian, Hensler, Gerhard

We present a new particle code for modelling the evolution of galaxies. The code is based on a multi-phase description for the interstellar medium (ISM). We included star formation (SF), stellar...

Modelling galaxies with a 3D multi-phase ISM (2004)

Harfst, Stefan, Theis, Christian, Hensler, Gerhard

We present a new particle code for modelling the evolution of galaxies. The code is based on a multi-phase description for the interstellar medium (ISM). We included star formation (SF), stellar...

Exchange Processes in a Multi-Phase ISM (2001)

Harfst, Stefan, Theis, Christian, Hensler, Gerhard

We present a new particle based code with a multi-phase description of the ISM implemented in order to follow the chemo-dynamical evolution of galaxies. The multi-phase ISM consists of clouds (sticky...

Modeling Interacting Galaxies Using a Parallel Genetic Algorithm (1999)

Theis, Christian, Harfst, Stefan

Modeling of interacting galaxies suffers from an extended parameter space prohibiting traditional grid based search strategies. As an alternative approach a combination of a Genetic Algorithm (GA)...