Two-moment cosmic ray transport in RAMSES Article Swipe
Joakim Rosdahl
,
Yohan Dubois
,
B. Commerçon
,
N. Diallo
,
N. Lin
,
Alexandre Marcowith
·
YOU?
·
· 2025
· Open Access
·
YOU?
·
· 2025
· Open Access
·
Cosmic rays (CRs) are an important source of feedback in a variety of astrophysical contexts. Magneto-hydrodynamical (MHD) simulations treating CRs as a fluid have shown that how their feedback operates is strongly dependent on their transport properties such as diffusion and streaming. In this paper we introduce the numerical implementation, in the adaptive-mesh-refinement MHD code RAMSES, of the grey two-moment formulation of CR fluid dynamics, which follows the energy density and its associated three-dimensional flux. This method is tested for CR diffusion, streaming, and advection in a series of multi-dimensional tests including shocks to check the robustness and stability of this numerical two-moment CRMHD solver. We finally use the new two-moment CR implementation in a complex simulation of an isolated galactic disc producing galaxy-wide outflows launched by small-scale supernova explosions, and compare it with a previously existing one-moment formulation in the same code.
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- article
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- en
- Landing Page
- http://arxiv.org/abs/2509.19447
- https://arxiv.org/pdf/2509.19447
- OA Status
- green
- OpenAlex ID
- https://openalex.org/W4414933432
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Two-moment cosmic ray transport in RAMSESWork title
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articleOpenAlex work type
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enPrimary language
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2025Year of publication
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2025-09-23Full publication date if available
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Joakim Rosdahl, Yohan Dubois, B. Commerçon, N. Diallo, N. Lin, Alexandre MarcowithList of authors in order
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https://arxiv.org/abs/2509.19447Publisher landing page
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https://arxiv.org/pdf/2509.19447Direct link to full text PDF
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YesWhether a free full text is available
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greenOpen access status per OpenAlex
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https://arxiv.org/pdf/2509.19447Direct OA link when available
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0Total citation count in OpenAlex
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