AMReX-Astro Microphysics is a collection of microphysics routines (equations of state, reaction networks, ...) and utilities (ODE integrators, NSE solvers) for astrophysical simulation codes.
The original design was to support codes based on the AMReX adaptive mesh refinement library :cite:`amrex_joss`, including CASTRO :cite:`castro_I`, MAESTROeX :cite:`maestroex`, and, later, Quokka :cite:`quokka`. These all have a consistent interface and the separate Microphysics repository allows them to share the same equation of state, reaction networks, and more.
Microphysics is written in C++ as a (mostly) header-only library, making extensive use of templating and C++ constexpr features to be performant on both CPU and GPU architectures. It is compatible with both NVIDIA CUDA and AMD HIP/ROCm.
While there are a number of unit tests that exercise the functionality, Microphysics is primarily intended to be used along with another simulation code. At the moment, the interfaces and build stubs are compatible with the AMReX codes and use the AMReX build system.
Note
A number of the routines contained here we authored by other people. We bundle them here with permission, usually changing the interfaces to be compatible with our standardized interface. We in particular thank Frank Timmes for numerous reaction networks and his equation of state routines.
.. toctree:: :maxdepth: 1 :caption: Microphysics overview :hidden: getting_started design data_structures rp_intro
.. toctree:: :maxdepth: 1 :caption: EOS and transport :hidden: eos eos_implementations transport
.. toctree:: :maxdepth: 1 :caption: Reaction networks :hidden: networks-overview networks templated_networks screening neutrinos
.. toctree:: :maxdepth: 1 :caption: ODE integrators :hidden: integrators ode_integrators nse sdc
.. toctree:: :maxdepth: 1 :caption: Util / external libraries :hidden: util autodiff
.. toctree:: :maxdepth: 1 :caption: Unit tests :hidden: unit_tests unit_test_runtime_parameters comprehensive_tests one_zone_tests
.. toctree:: :maxdepth: 1 :caption: References :hidden: citing changes zreferences
.. toctree:: :maxdepth: 1 :caption: Index :hidden: genindex