| Name: HITEN HITEN |
| Affiliation: NIT, Calicut |
| Conference ID: ASI2026_82 |
| Title: Primordial Magnetic Fields and Early Structure Formation: Implications for the High-Redshift 21 cm Signal |
| Abstract Type: Poster |
| Abstract Category: Galaxies and Cosmology |
| Author(s) and Co-Author(s) with Affiliation: HITEN(National Institute of Technology, Calicut-673601, India), Anoop Krishna(National Institute of Technology, Calicut-673601, India), Deepthi Moorkant(National Institute of Technology, Calicut-673601, India), Dr. Rajesh Mondal(National Institute of Technology, Calicut-673601, India) |
| Abstract: Primordial magnetic fields (PMFs) can act as an additional source of small-scale density perturbations, thereby enhancing matter clustering at comoving wavenumbers that are significantly higher than those sourced by standard inflationary initial conditions. This excess small-scale power accelerates the collapse of low-mass dark matter halos, advances the onset of star formation, and can therefore modify the radiation backgrounds (Ly-α, X-ray, ionizing UV). The redshifted 21-cm signal from neutral hydrogen during Cosmic Dawn (CD) and the Epoch of Reionization (EoR) is a potential probe of this accelerated structure formation. We use N-body simulations to generate the halo abundance, which are the sites of the first luminous sources, to study the impact of PMFs on the 21-cm signal during the EoR. We find that stronger PMF contributions significantly enhance early halo formation, resulting in an earlier and faster reionization compared to the standard ΛCDM scenario. This ongoing work demonstrates that the 21-cm signal offers a promising avenue for constraining PMF models |
