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To promote progress in the practice of 21 cm experiments, we are organizing a summer school on 21 cm cosmology under the financial support by NSFC, which is scheduled to be held between July 2nd to 15th, 2025, in Xi'an Sanxi, P.R.China. This intensive 14-day summer school integrates theoretical foundations, observational techniques, and cutting-edge research in 21cm cosmology. Designed for graduate students, postdocs, and early-career researchers, the program bridges modern cosmological theories with 21cm signal detection across cosmic epochs.

Following the summer school, 21 cm Cosmology Workshop 2025 and Tianlai Collaberation Meeting will be held at the same location.  During this period, we will discuss important common challenges: calibration, sources of locally correlated signals, foreground mitigation, cross-correlations, systematics from digital signal processing, validation, and software tools.

‌Dates‌:
‌Registration‌: July 2nd, 2025
‌Lectures‌: July 3rd - July 14th, 2025
‌Departure‌: July 15th, 2025
‌Location‌:
Xidian University, Xi'an

The summer school will include two parts:

(1) The systematic reports, which will include four modules:

Module 1: Foundations of Modern Cosmological Physics‌;
‌Module 2: Large-Scale Structure of the Universe‌;
‌Module 3: Radio Astronomy‌;
‌Module 4: 21cm Cosmology‌.

(2) The frontier review reports, which will focus on the frontier progress about the 21 cm cosmology, and will be given by about ten invited senior professors or research fellows.

The live broadcast online: https://www.koushare.com/live/details/44018

‌Selection and Enrollment‌: Based on applications, we plan to select and enroll 80-100 participants.

‌Registration Fees‌:
1500 yuan (shared room); or 2500 yuan (single room)

‌Tuition and Materials‌: All participants are exempt from tuition and lecture materials fees. The summer school covers accommodation and meals. Due to limited funding, only a small number of graduate students, postdoctoral researchers, and young faculty members will receive financial support.

‌Registration Deadline‌:
To ensure proper arrangements for venue and accommodation, all participants are requested to register via this website before June 1st. All the applications will receive the decision email  before June 6th. Please note that a late payment surcharge of 200 Yuan will be applied to all the approved participants submitted after June 15th.

Payment is recommended by scanning the following QR code using Wechat-pay or Ali-pay. When making an online payment, please kindly leave the massage "21cmSummerSchool + Your Name + Institute".

‌Conference Email‌: tyx0405@hdu.edu.cn (Yi-Xi Tao)
‌Contacts‌: Hai-Jun Tian (13618692803)，Feng Shi (17795730215)
‌Conference Website‌: https://conferences.koushare.com/21cmCosmology