| Name: Pooja Rani |
| Affiliation: Tata Institute of Fundamental Research, Mumbai |
| Conference ID: ASI2026_599 |
| Title: Convergence Tests of Monte Carlo Lyman-alpha Radiative Transfer Simulations for 21-cm Cosmic Dawn Modeling |
| Abstract Type: Poster |
| Abstract Category: Galaxies and Cosmology |
| Author(s) and Co-Author(s) with Affiliation: Pooja Rani(Tata Institute of Fundamental Research, Mumbai-400005, India), Shikhar Mittal(University of Cambridge, Cambridge, CB3 0HE, UK), Girish Kulkarni(Tata Institute of Fundamental Research, Mumbai-400005, India) |
| Abstract: Interpreting the 21-cm signal from Cosmic Dawn requires accurate modeling of the Lyman-alpha background, yet most theoretical studies rely on ideal-gas assumptions and simplified treatments of multiple scattering. We present convergence tests of a Monte Carlo radiative transfer framework that directly follows Lyman-alpha photons in cosmological simulations, avoiding these approximations. By systematically varying numerical and physical parameters—resolution, photon statistics, propagation step length, stopping criteria, and box size—we identify the regimes where the simulated Lyman-alpha background is numerically stable. These results strengthen confidence in 21-cm signal predictions and provide a robust basis for extracting astrophysical and cosmological constraints from upcoming observations. |
