Dec 11 – 15, 2023
Tsung-Dao Lee Institute
Asia/Shanghai timezone

Imprints of cosmic reionization as a probe of dark matter nature in the post-reionization era

Dec 15, 2023, 2:45 PM
Poster Poster


Yao Zhang (Tsinghua University)


We propose a novel mechanism for constraining warm dark matter (WDM) models via the so-called “memory of reionization” effect, which is that the thermal history of gas after cosmic reionization is sensitive to when the gas is reionized. The suppression of small-scale structure due to WDM affects the evolution of post-reionization gas, while thermal relics can couple to ionized bubbles at the scales of tens of Mpc. As such, the small-scale effect due to WDM can leave an imprint on the gas at large scales, which can be observed by Ly$\alpha$ forest and HI 21 cm intensity mapping. We forecast the accuracy of constraints on WDM using Ly$\alpha$ forest 3D power spectrum with DESI-like surveys, and 21 cm power spectrum with SKA1-LOW and PUMA surveys. We demonstrate that this approach can provide unprecedentedly tight constraints on WDM mass.

Primary authors

Catalina Morales-Gutiérrez (University of Costa Rica) Christopher M. Hirata (The Ohio State University) Heyang Long (The Ohio State University) Paulo Montero-Camacho (Peng Cheng Laboratory) Yao Zhang (Tsinghua University) Yi Mao (Tsinghua University)

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