The 3rd Shanghai Assembly on Cosmology and Structure Formation

Cosmological Inference for CD/EoR 21cm Power Spectrum and Imaging

Nov 21, 2025, 9:55 AM

15m

Tsung-Dao Lee Institute

Talk Cosmology and Large-scale Structure Cosmology 7

Speaker

Jiajun Zhang (Shanghai Astronomical Observatory, CAS)

Description

SKA Science Data Challenge 3b (SDC3b) ended in May 2025 and released the results in August. Participants are required to perform inference on the simulated 21cm power spectrum and imaging to estimate the HI fraction. The simulation represents the SKA-Low observation of the 21cm signal from Cosmic Dawn and Era of Reionization (CD/EoR). YEYE team participated and submitted results on all four challenges, got No.1, No.3, and No.7 in IM1, PS3, and PS2 challenges, respectively. I will briefly introduce what SDC3b is, the algorithm YEYE has developed, and the experience from SDC3b.