Astrophysics Seminar

Under the standard Lambda-CDM cosmology, the expansion rate of our Universe at the present is derived as 67.4 km/sec/Mpc from the CMB observation made by the Planck collaboration. In the recent past people have tried to estimate the Hubble constant at present using SNIa as a cosmological tool and the results differ very much with CMB. The discrepancy in the H0 is coined as Hubble tension and demands a new cosmological model in order to explain the present expansion rate of the Universe. The independent cross-check of the SNIa measurement is extremely important for the future of cosmology. We are standardizing quasars for independent cosmological probes through reverberation mapping. I will talk about the importance and challenges of quasars application to Cosmology and discuss our results.