Misc,
Phantom of RAMSES (POR): A new Milgromian dynamics N-body code
(May 23, 2014)
Abstract
Since its first formulation in 1983, Milgromian dynamics (MOND) has been very
successful in predicting the gravitational potential of galaxies from the
distribution of baryons alone, including general scaling relations and detailed
rotation curves of large statistical samples of individual galaxies covering a
large range of masses and sizes. Most predictions however rely on static
models, and only a handful of N-body codes have been developed over the years
to investigate the consequences of the Milgromian framework for the dynamics of
complex evolving dynamical systems. In this work, we present a new Milgromian
N-body code, which is a customized version of the RAMSES code (Teyssier 2002)
and thus comes with all its features: it includes particles and gas dynamics,
and importantly allows for high spatial resolution of complex systems due to
the adaptive mesh refinement (AMR) technique. It further allows the direct
comparison between Milgromian simulations and standard Newtonian simulations
with dark matter particles. We provide basic tests of this customized code and
demonstrate its performance by presenting N-body computations of
dark-matter-free spherical equilibrium models as well as dark-matter-free disk
galaxies in Milgromian dynamics.
