Selfgravity+&+sink+particles

=Selfgravity and Sink Particles=

Questions

 * 1) Which methods are best suited -- especially in terms of //**intrinsic speed**// and //**scaling**// to very large numbers of CPUs on distributed memory machines -- for treating selfgravity in the case of
 * 2) Unigrid codes: Fourier transforms or multigrid?
 * 3) AMR codes: Traps to avoid? Are there alternatives to multigrid?
 * 4) SPH codes: What's the state-of-the-art -- especially in terms of scaling to 1000's of CPUs?
 * 5) What happened with the issue of "artificial fragmentation" in SPH (juhuu -- Fisher and Bate in the audience?)
 * 6) Which are the preferred methods (in technical terms) for treating sink particles in
 * 7) Unigrid and AMR codes?
 * 8) SPH codes? Are there issues with pressure boundary conditions?
 * 9) Does it at all make sense (in unigrid or AMR codes) to use e.g. gravity softening or barotropic equations of state to avoid the use of sink particles?
 * 10) Given the fact that magnetic fields are likely to be crucially important in most collapsing cores, does it make sense to use very elaborate treatments of pure-hydro sink particles (which e.g. conserve angular momentum and "refuse" to accrete from their surrounding disks, etc.)?
 * 11) Can we come up with simplifications of the sink particle concept (perhaps in the light of item 4. above) which ease their implementation (in grid as well as SPH contexts)?
 * 12) Is it possible to predict, e.g. with a clumpfind algorithm, the location of near-future collapsing cores?