Dr. Sayan Saha’s current research focuses on the study of galaxy clusters, which are the largest gravitationally collapsed structures in the universe and hold significant cosmological relevance. His work specifically delves into the weak gravitational lensing of background signal by these galaxy clusters. At present, he is envolved in reconstructing cluster mass profiles using shear data from NASA’s SuperBIT, a balloon-based imaging telescope.
Sayan earned his PhD from the Indian Institute of Science Education and Research (IISER) Pune, India, where he studied high-redshift galaxy clusters using weak lensing of the Cosmic Microwave Background (CMB). His research also included investigating the violation of statistical isotropy in the CMB due to the motion of the observer’s frame. Sayan’s work employs sophisticated Bayesian techniques such as Hamiltonian Monte-Carlo (HMC) sampling and iterative Maximum-a-posteriori methods to estimate cosmological parameters.
Some of his codes can be found on GitHub: https://github.com/s-Sayan.