School and Workshop on 21-cm Cosmology

Session

Session 5

10 Mar 2026, 10:05

AG66

Conveners

Session 5

• Chair: Suman Majumdar (IIT Indore)

38. Non-Gaussian Signatures of High HI 21-cm Optical Depth in Real and Redshift Space during Cosmic Dawn

Iffat Nasreen (Jadavpur University)

10/03/2026, 10:05

The HI 21-cm optical depth can be significantly high in regions with dense neutral hydrogen and low spin temperature during CD. Therefore, during this epoch the commonly used equation for calculating HI 21-cm differential brightness temperature considering linear approximation of optical depth tends to overestimate the signal compared to the signal using exact equation. These corrections...

39. Global 21 cm Cosmology from Space

Narendra S (RRI)

10/03/2026, 10:25

The Cosmic Dawn (CD) and the Epoch of Reionisation (EoR) mark two pivotal phases in the thermal and ionisation history of the Universe, driven by the formation of the first stars and galaxies. The redshifted 21-cm hyperfine transition of neutral hydrogen provides a powerful probe of these epochs. The global sky-averaged 21-cm monopole signal traces the mean evolution of the intergalactic...

40. Machine Learning Framework for Reliable 21-cm Extraction from Single-Radiometer Observations

Anshuman Tripathi (IIT Indore)

10/03/2026, 10:45

The Cosmic Dawn (CD) and the Epoch of Reionization (EoR) mark pivotal stages in the early evolution of the Universe, occurring within the first billion years after the Big Bang. Despite their importance, the physical properties of the intergalactic medium (IGM) during these epochs remain poorly constrained by observations. Current and forthcoming low-frequency radio experiments, such as EDGES,...