Authors: Francesca Iannuzzi and Klaus Dolag
Link to paper
The authors describe the implementation of adaptive gravitational softening in GADGET. The softening lenght is a function of the local density, as for standard SPH. A correction to the formulation of the Lagrangian is necessary to reduce noise and preserve the translational invariance.
Applied to cosmological simulations, the enhanced resolution at high densities shows in the increase of particle clustering at small scales, amplitude of the correlation function, and inner profile of massive haloes. This allows to recover the results of higer resolution simulations at much lower computational costs.
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