Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: GENGA II: GPU planetary N-body simulations with non-Newtonian forces and
  high number of particles   We present recent updates and improvements of the graphical processing unit
(GPU) N-body code GENGA. Modern state-of-the-art simulations of planet
formation require the use of a very high number of particles to accurately
resolve planetary growth and to quantify the effect of dynamical friction. At
present the practical upper limit is in the range of 30'000 - 60'000 fully
interactive particles, with possibly a little more on the latest GPU devices.
While the original hybrid symplectic integration method has difficulties to
scale up to these numbers, we have improved the integration method by i)
introducing higher level changeover functions, and ii) the code is better able
to use the most recent GPU hardware efficiently for such large simulations. We
added treatments of non-Newtonian forces such as general relativity, tidal
interaction, rotational deformation, the Yarkovsky effect and
Poynting-Robertson drag as well as a new model to treat virtual collisions of
small bodies in the Solar System. We added new tools to GENGA, such as
semi-active test particles that feel more massive bodies but not each other, a
more accurate collision handling and a real-time openGL-visualization. We
present example simulations, including a 1.5 billion year terrestrial planet
formation simulation that initially started with 65536 particles, a 3.5 billion
year simulation without gas giants starting with 32768 particles, the evolution
of asteroid fragments in the Solar System, and the planetesimal accretion of a
growing Jupiter simulation. GENGA runs on modern NVIDIA and AMD GPUs.

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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics