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

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

15 Dec 2023, 14:45
1h
Poster Poster

Speaker

Yao Zhang (Tsinghua University)

Description

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)

Presentation materials

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