Comparing Extended System Interactions with Motions in Softened Potentials

@article{Barnes2015ComparingES,
  title={Comparing Extended System Interactions with Motions in Softened Potentials},
  author={Eric I. Barnes},
  journal={arXiv: Instrumentation and Methods for Astrophysics},
  year={2015}
}
  • E. Barnes
  • Published 30 July 2015
  • Physics
  • arXiv: Instrumentation and Methods for Astrophysics
Using an $N$-body evolution code that does not rely on softened potentials, I have created a suite of unbound interacting cluster pair simulations. The motions of the centers of mass of the clusters have been tracked and compared to the trajectories of point masses interacting via one of four different softened potential prescriptions. I find that the relationship between the impact parameter of the cluster interaction and the point-mass softening length that best approximates each cluster's… 
1 Citations

Figures from this paper

Small-Scale Challenges to the ΛCDM Paradigm
The dark energy plus cold dark matter (ΛCDM) cosmological model has been a demonstrably successful framework for predicting and explaining the large-scale structure of the Universe and its evolution

References

SHOWING 1-10 OF 18 REFERENCES
Optimal softening for force calculations in collisionless N-body simulations
In N-body simulations the force calculated between particles representing a given mass distribution is usually softened, to diminish the effect of graininess. In this paper we study the effect of
Softening in N-body simulations of collisionless systems
The standard Plummer softening force law is physically inconsistent: the force on a particle is calculated as if it were a point mass, but its contribution to the gravitational field for other
Tidal interactions between spherical galaxies
The impulse approximation and full N-body experiments are used to investigate the changes in mass and binding energy which result from gravitational encounters between spherical galaxies. Models with
The Cosmological simulation code GADGET-2
We discuss the cosmological simulation code GADGET-2, a new massively parallel TreeSPH code, capable of following a collisionless fluid with the N-body method, and an ideal gas by means of smoothed
The inner structure of ΛCDM haloes – I. A numerical convergence study
We present a comprehensive set of convergence tests which explore the role of various numerical parameters on the equilibrium structure of a simulated dark matter halo. We report results obtained
The dynamical fate of binary star clusters in the Galactic tidal field
Fragmentation and fission of giant molecular clouds occasionally results in a pair of gravitationally bound star clusters that orbit their mutual centre of mass for some time, under the influence of
Gravitational softening as a smoothing operation
In self-consistent N-body simulations of collisionless systems, gravitational interactions are modified on small scales to remove singularities and simplify the task of numerically integrating the
GADGET: a code for collisionless and gasdynamical cosmological simulations
TREESPH: A Unification of SPH with the Hierarchical Tree Method
A new, general-purpose code for evolving three-dimensional, self-gravitating fluids in astrophyics, both with and without collisionless matter, is described. In this TREESPH code, hydrodynamic
NBODY2: A direct N-body integration code
...
...