Current Research

Primarily, I consider myself a mathematical physicist applying mathematical techniques to various aspects of physics. I worked on particle physics early in my career. My first few papers were on the application of discrete symmetries to neutrino mixing. During my PhD, my research focus shifted to gravity and some aspects of quantum mechanics. I studied the dynamics of gravity, focusing on Einstein's general relativity and a particular generalization to higher dimensions known as Lanczos-Lovelock gravity. In particular, I explored the structure of the action and the boundary terms (total derivative terms) required in gravitational theories. A main result obtained by our group in this direction was the generalization of boundary terms in the literature to the case of null boundaries (when the boundary is formed by a light front). I have also worked on various aspects of quantum mechanics during my PhD and as a postdoc. Currently, I am working on the structure of the actions for various theories of gravity and on the application of quantum information theory to cosmological scenarios.

Recent Publications

1. R. N. Raveendran, K. Parattu, and L. Sriramkumar, "Enhanced power on small scales and evolution of quantum state of perturbations in single and two field inflationary models," Gen.Rel.Grav. 54 (2022) no.8, 91, arXiv:2206.05760.
2. S. Chakraborty and K. Parattu, "Null boundary terms for Lanczos-Lovelock gravity," Gen.Rel.Grav. 51 (2019) no.2, 23, arXiv:1806.08823, Editor's Choice.
3. K. Parattu, S. Chakraborty, B. R. Majhi, and T. Padmanabhan, "A boundary term for the gravitational action with null boundaries," Gen. Rel. Grav. 48 (2016), no. 7, 94, arxiv:1501.01053, Most cited paper in the journal for the year 2016.
4. K. Parattu, B. R. Majhi, and T. Padmanabhan, "Structure of the gravitational action and its relation with horizon thermodynamics and emergent gravity paradigm," Phys.Rev. D87 (2013), no. 12, 124011, arxiv:1303.1535
5. K. M. Parattu and A. Wingerter, "Tribimaximal Mixing From Small Groups," Phys. Rev. D84 (2011) 013011, arxiv:1012.2842