School and Workshop on 21-cm Cosmology

Session

Session 6

10 Mar 2026, 12:10

AG66

Conveners

Session 6

• Chair: Yogesh Wadadekar (NCRA)

41. Convergence Tests for Lyman-alpha Radiative Transfer Simulations at Cosmic Dawn and its impact on 21cm Signal.

Pooja Rani (TIFR)

10/03/2026, 12:10

Interpreting the 21-cm signal from Cosmic Dawn requires accurate modeling of the Lyman-α background, yet most theoretical studies rely on ideal-gas assumptions and simplified treatments of multiple scattering. We present convergence tests of a Monte Carlo radiative transfer framework that directly follows Lyman-α photons in cosmological simulations, avoiding these approximations. By...

42. Constraining Primordial Black Holes in light of CMB Spectral Distortion and 21-cm global signal

Shibsankar Si (NIT Meghalaya)

10/03/2026, 12:30

Primordial black holes (PBHs) can form spike density halos through the accretion of weakly interacting massive particles (WIMPs). In these halos, the enhanced density significantly boosts the annihilation rate of WIMPs. For Majorana dark matter annihilation into light fermions, the s-wave part of the annihilation cross section is helicity-suppressed, making the p-wave contribution dominant. We...