Abstract Details
| Name: Suvedha Naik Affiliation: Manipal Centre for Natural Sciences MCNS, MAHE Conference ID: ASI2019_368 Title : Probing primordial features using red-shifted 21 cm line Authors and Co-Authors : Suvedha Suresh Naik, Kazuyuki Furuuchi Abstract Type : Oral Abstract Category : General Relativity and Cosmology Abstract : Cosmic Microwave Background (CMB) observations reveal tiny inhomogeneities in temperature which indicates perturbation of density existed in the beginning of the universe called Primordial Density Perturbation (PDP). Near future observations of red-shifted 21 cm line from neutral hydrogen will open up a new and exciting window for probing cosmology and fundamental physics. Future observations (such as SKA) of red-shifted 21 cm will provide new data of matter distribution in the redshift range z < 27. The observational data of CMB and large scale structures are well explained by the standard ΛCDM model which assumes an almost scale invariant power spectrum of PDP. The new particle physics model of cosmic inflation predicts bump like features in the power spectrum of PDP. This model arises from a compactification of higher dimensional gauge theory. Observations of 21 cm line fluctuations are expected to be a promising tool to test such inflation models. These futuristic observations of red-shifted 21 cm line can be compared with predictions of theoretical models using simulations of cosmological 21 cm signal. We simulate cosmological volumes of 21 cm line fluctuations using semi-numeric code 21cmFAST. We modified the initial power spectrum template by adding a feature parameterized by the amplitude A and scale k in 21cmFAST. We present the impact of modifying the feature parameters on simulation outputs such as power spectrum of differential brightness temperature. |