EvoEMD : cosmic Evolution with an Early Matter-Dominated era

A framework to evaluate the evolution w/ or w/o an early matter dominated (EMD) era.

Features

• Global parameter system
• Global particle system
• Global process system
• Different methods for Hubble parameter calculation
• Automatically build up the Boltzmann equation according to the user's definition of particle and process
• Solving the Boltzmann equation using 4th order Runge-Kutta method with adaptive steps tailored to Cosmology application
• Cache the collision rate calculation results for fast evaluation

Document

The physics behind the EvoEMD and technical details can be found in:

• M. Dutra, Y. Wu; EvoEMD: cosmic evolution with an early matter-dominated era; arXiv: 2111.15665

If you are using EvoEMD, please cite above paper.

Dependencies

• GSL (At least v2.0 is required)
• Cuba
• spdlog (Included in EvoEMD)

Installation

Make sure that GSL (later than v2.0) is there which can be installed through many package management systems (apt-get, brew, etc.). Downloading Cuba from the website and compiling it such that one can find cuba.h and libcuba.a in its directory.

git clone https://github.com/ycwu1030/EvoEMD.git
cd EvoEMD
mkdir build; cd build
cmake -DCMAKE_INSTALL_PREFIX=INSTALL_PATH -DCUBA_ROOT=CUBA_PATH ../
make
make install # Optional

where INSTALL_PATH should be replaced by the directory where you want to install the EVOEMD library, CUBA_PATH should be replaced by the CUBA directory. Then one can find the executable for the examples in EvoEMD/build/bin.

The last command is optional, which install the whole library is into INSTALL_PATH (If it is a system folder, one should also use sudo). The headers are in INSTALL_PATH/include, while the shared library is in INSTALL_PATH/lib. If users want to integrate EvoEMD into their own CMake project, we also provide FindEVOEMD.cmake in INSTALL_PATH/share/cmake/Modules as well as SOURCE_DIR/cmake/Modules.

Examples

Simple examples can be found in corresponding folders under Models:

• ToyDM
  • A toy DM model, including freeze-in and freeze-out case.
• ToyLeptogenesis
  • A toy Leptogenesis model, the heavy neutrino can be initially thermalized or un-thermalized.