"To myself I am only a child playing on the beach, while vast oceans of truth lie undiscovered before me." - Sir Isaac Newton
I have defended my PhD thesis at SISSA on 19th September, 2019. Cora Dvorkin from Harvard University and Paolo Natoli from the University of Ferrara were external examiners of my thesis. If you are interested to have a look in my thesis, please have look at this link.
We are living in the era of precision cosmology which has the potential to unravel many mysteries of the Universe in the coming years. My current research interests lie at the interface of Astrophysics and Cosmology, in particular on the Cosmic Microwave Background (CMB), large scale structure formation in the Universe and reionization process. The study of CMB by COBE, WMAP and Planck, have already set up the building blocks of Cosmology by measuring the age, content, curvature of the Universe and constrained many other cosmological parameters which are used to describe the elementary laws of the Universe. Now the question comes what new information CMB research can give when the next generation high sensitive telescopes will start to take data in the next few years? And my research venture starts from this point....
Theoretical Modelling: We have a very poor understanding of how and exactly when the reionization process happened based on our current observational data. I want to take this advantage to understand better the physics of reionization and constrain the associated astrophysical parameters focusing its effect on the CMB anisotropies. I worked on the reionization histories of the universe considering high redshift galaxies are the main source of reionization. I am currently studying secondary B-mode (Curl-like polarization in the CMB sky) signal introduced by inhomogeneous reionization and investigating the imprints of thermal and kinetic Sunyaev Zeldovich effect and weak lensing in CMB.
Forecasts I am interested to investigate what kind of new signals can be detected as we will have access to the datasets of telescopes with high sensitivity and high resolution. I made forecasts of the detachability of patchy reionization signal by CMB S4 experiment. Currently, I am analyzing the radiative transfer simulation of the reionization process. I am also involved in cross-correlation studies of CMB with other multiple tracers (21cm observation, Lyman-alpha data etc.) to understand the large scale structure formation.
Foreground Modeling: It is also very much important to characterize the desired signal with certain accuracy but unfortunately, the foreground is a major obstacle for the detection of these signals. Till now foreground modelling is at the very early stage of our physical understanding. As foreground emissions by dust and synchrotron are very hard to model, I am trying to understand the statistical properties of the foreground. In particular, I am very much interested in probing the higher order statistics of foreground emission.