Abstract Details

Name: Akshay Rana
Affiliation: JRF
Conference ID: ASI2017_725
Title : Constrain on cosmic curvature by using statistical properties of gravitational lenses
Authors and Co-Authors : Akshay Rana (JRF), Dr. Deepak Jain, Prof. Shobhit Mahajan, Prof. Amitabha Mukherjee.
Abstract Type : Poster
Abstract Category : General Relativity and Cosmology
Abstract : We use a model-independent method to constrain the curvature of the Universe. It pro- vides us an indirect method to test the curvature based on the mean image separation statistics of gravitationally lensed quasars. The basis of this methodo is that the mean image separation of gravitationally lensed quasars is completely independent of the source redshift for the all FLRW based cosmological models in a flat Universe, if the lensing galaxy is non-evolving and modeled as a Singular Isothermal Sphere (SIS). We use the final statistical sample of lensed quasars from the Sloan Digital Sky Survey (SDSS) Quasar Lens Search (SQLS) for this purpose. Further, In order to smoothen the datasets, we use a non-parametric method namely, Gaussian process (GP). Finally, we find that this method supports the spatially flat Universe within 3σ level.