DarkHistory: A Code for Computing Ionization and Thermal Histories with Dark Matter Energy Injection
Measurements of the CMB and future 21-cm results can set significant constraints on dark matter annihilation or decay. To obtain such limits, a good understanding of how dark matter energy injection affects the ionization and thermal history of the universe is crucial. In this talk, I will present a new and open-source code package called
DarkHistory, which will compute these histories efficiently and accurately. The code will fully account for both the non-instantaneous nature of energy deposition during the dark ages, and the back-reaction of increased ionization levels on energy deposition into the intergalactic medium, allowing
DarkHistory to be used at the end of the cosmic dark ages and during the epoch of reionization. Improvements to various cooling and deposition processes such as inverse Compton scattering and photo-excitation will also be discussed.