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Poojan Agrawal

My work is to construct a new theoretical model for globular cluster formation with multiple stellar populations. Globular clusters are the most massive and oldest class of star cluster populations; they host a variety of stars at different stages of their life including some of the exotic ones like blue stragglers, low-mass X-ray binaries and millisecond pulsars. A good part of our understanding of stellar evolution comes from them. However, recent observational studies have discovered that most of the GCs consist of different stellar populations with different chemical abundances; GCs are no longer a simple stellar system with a single age and a single metallicity, as previously thought. This new discovery has revolutionized the research field and demands a more realistic model for the formation and dynamical evolution of GCs to be developed. This is important not just from the point of view of understanding stellar properties like chemical abundances, stellar kinematics and radial structure but also for constraining binary population in globular clusters which are important sources of Gravitational waves. In particular, a better understanding of the early evolution of clusters (when BHs are forming) is important for theoretical predictions of gravitational wave signals from compact binaries. Hence, my task involves modifying the N-body code called NBODY6 for modelling properties of stars in a cluster and using the results to account for the observations and thereby, making new predictions.

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