Abstract Details

Name: Suvedha Naik
Affiliation: Manipal Centre for Natural Sciences, Centre of Excellence
Conference ID: ASI2020_315
Title : The Impact of Primordial Power Spectrum with Features on Cosmological 21 cm Signal
Authors and Co-Authors : Suvedha Suresh Naik*, Kazuyuki Furuuchi** *PhD Student, Manipal Centre for Natural Sciences, Manipal Academy of Higher Education **Associate Professor, Manipal Centre for Natural Sciences, Manipal Academy of Higher Education
Abstract Type : Oral
Abstract Category : General Relativity and Cosmology
Abstract : The observations from Cosmic Microwave Background (CMB) and large scale structure has revealed the imprints of Primordial Density Perturbations (PDPs). The currently available observational data are well explained by the concordance ΛCDM model which assumes an almost scale invariant power spectrum of PDPs. We studied the particle physics model of cosmic inflation based on compactification of higher dimensional gauge theory. The model predicts bump-like features in the power spectrum of PDPs. Such features arise from the cosmological particle production during inflation. The near-future observations of redshifted 21 cm line (such as SKA) are expected to provide new insights about the matter distribution in the Universe in the redshift regime z<27. The tomographical observation of 21 cm line fluctuations along with the potential to probe the unexplored dark ages, makes it a promising tool to test inflation models. We simulate the cosmological 21 cm line fluctuations using semi-numeric code with a modified initial power spectrum parameterized by the location and amplitude of the bump. In this work, we present the impact of additional feature parameters on the observable quantities such as power spectrum of differential brightness temperature.