1,721,007 research outputs found
N-MODY: a code for collisionless N-body simulations in modified Newtonian dynamics
No full textWe describe the numerical code N-MODY, a parallel particle-mesh code for collisionless N-body simulations in modified Newtonian dynamics (MOND). N-MODY is based on a numerical potential solver in spherical coordinates that solves the non-linear MOND field equation, and is ideally suited to simulate isolated stellar systems. N-MODY can be used also to compute the MOND potential of arbitrary static density distributions. A few applications of N-MODY indicate that some astrophysically relevant dynamical processes are profoundly different in MOND and in Newtonian gravity with dark matter
N-body simulations of dissipationless galaxy formation
No full textWe study the dissipationless collapse scenario for galaxy formation with the help of high-resolution numerical simulations realized with our parallel N-body code FVFPS. In accordance with previous studies, we find that the structural properties of the simulation end-products are consistent with those of real elliptical galaxies. In particular, in the central regions the final surface density distributions are characterized by flat cores, whose size is correlated with the initial virial ratio. Similar cores are observed in the surface brightness profiles of the so-called `core' elliptical galaxies. We conclude that dissipationless collapse is a plausible alternative to the binary black hole scenario as origin of the observed cores
Numerical investigation of Maxwell-Vlasov equations. Part I: basic physics and algoritms
No full textNumerical investigation of Maxwell-Vlasov equations. Part II: preliminary tests and validation
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