I work on theoretical aspects of nonequilibrium statistical systems. Recent works have focussed on:
A. Cooling granular matter: Grainy matter may often be modelled as dissipative gases. Such systems, initially disturbed, often evolve with time to exhibit universal statistical properties. We study such properties using molecular dynamics simulations and scaling theories.
B. Active matter: We are interested in ordering kinetics and large scale fluctuations in self-propelled systems.
C. Biophysical systems: We are interested in stochastic processes associated with -- (i) Nucleosome kinetics on DNA, and associated effects on gene expression, (ii) Kinetics of cytoskeletal filaments.
1. Aparna J. S -- Studies of cytoskeletal filaments.
2. Jyoti Sharma -- Experiments on non-linear systems.
3. Animesh Biswas -- Experiments on non-linear and granular systems.
4. Indrani Nayak -- Stoshastic processes in biology.
5. Saeed Ahmed -- Stochastic processes.
1. Mahendra Shinde (defended, 2010) -- pattern formation in cooling granular gases.
2. Supravat Dey (defended, 2012) -- pattern formation in active matter and dissipative gases.
[Post-doc -- Rochester Institute of Technology, USA]
3. Dipjyoti Das (defended, 2014) -- stochastic processes in cytoskeletal filaments and microbial populations.
[Post-doc -- Yale University, USA]
1. “Energy decay in Three-dimensional freely cooling granular gas'', Sudhir N. Pathak, Zahera Jabeen, Dibyendu Das and R. Rajesh,
Phys. Rev. Lett. 112 , 038001 (2014).
2. “Inhomogeneous Cooling of the Rough Granular Gas in Two Dimensions", Sudhir N. Pathak, Dibyendu Das, R. Rajesh,
Europhys. Lett. 107, 44001 (2014).
3. “Violation of Porod law in a freely cooling granular gas in one dimension'', Mahendra Shinde, Dibyendu Das, and R. Rajesh,
Phys. Rev. Lett. 99, 234505 (2007).
Biophysics and stochastic processes
4. "Signatures of a macoscopic switching transition for a dynamic microtubule", J. S. Aparna, Ranjith Padinhateeri, and Dibyendu Das,
Scientific Reports 7: 45747 (2017).
5. "Theoretical estimates of exposure timescales of protein binding sites on DNA regulated by nucleosome kinetics", Jyotsana J. Parmar, Dibyendu Das, and Ranjith Padinhateeri,
Nucleic Acids Research (online 2015) 44, 1630 (2016).
6. “Collective force generated by multiple biofilaments can exceed the sum of forces due to individual ones'', Dipjyoti Das, Dibyendu Das and Ranjith Padinhateeri,
New J. Phys. 16, 063032 (2014).
7. “Spatial Structures and Giant Number Fluctuations in Models of Active Matter'', Supravat Dey, Dibyendu Das and R. Rajesh,
Phys. Rev. Lett. 108, 238001 (2012).
8. “Accurate statistics of a flexible polymer chain in shear flow'', Dibyendu Das and Sanjib Sabhapandit,
Phys. Rev. Lett. 101, 188301 (2008).