B 229
Theory of Stochatic Processes, and Non-equilibrium Statistical Physics and their applications to physical and biological systems.
I am interested in mathematical problems related to the biological processes in pathogen populations, gene expression, cell division and populations, cytoskeletal filaments, and neurons. A focus has been on first passage questions.
We have been closely working with experimentalists on both physical and biological problems.
Earlier I have worked on pattern formation & universal scaling properties of cooling granular matter, and active self-propelled particles and hard rods.
Post-doctoral Fellows
- Syed Yunus Ali (past) -- Stochastic Processes in Gene expression [Post-doc, University of Delaware]
- Rishu Singh (past) -- Ramanujan fellow, Benaras Hindu University
- Tripti Bameta (past) -- Scientific staff at TATA memorial (ACTREC)
Ph.d. Students
(Current):
- Hillol Barman -- Stochastic processes
- Arunendra Verma -- Stochastic processes and Active Matter
(Graduated):
- Krishna Rijal (2023) -- First passage and protein threshold crossing, and Synaptic transmission [Post-doc -- Harvard University, USA]
- Saeed Ahmed (2022) -- Stochastic Resetting and non-equilibrium transitions. [Post-doc -- Ohio State Univeristy, USA]
- Indrani Nayak (2021) -- First capture of a moving target under confinement. [Post-doc -- Ohio State University, USA]
- Animesh Biswas (2021) -- Experiments on mercury drops and camphor boats [Post-doc -- Ohio State University, USA]
- Jyoti Sharma (2021) --Experiments on non-linear camphor rotors. [Post-doc -- Pisa, Italy]
- Aparna J.S. (2019) -- Studies of cytoskeletal filaments.
- Dipjyoti Das (2014) -- stochastic processes in cytoskeletal filaments and microbial populations [Faculty -- IISER Kolkata]
- Supravat Dey (2012) -- pattern formation in active matter and dissipative gases. [Faculty -- SRM University, Andhra Pradesh]
- Mahendra Shinde (2010) -- pattern formation in cooling granular gases.
- Courses Taken
1. Classical Mechanics (PH401),
2. Mathematical Physics (PH407, PH408, PH223),
3. Statistical Physics (PH410, PH438, PH216),
4. Advanced Statistical Physics (PH543),
5. Physics of Biological Systems (PH549),
5. Electricity and Magnetism (PH102)
EDUCATION AND AFFILIATIONS
B.Sc. Physics — Presidency College, Kolkata, India (1990-93)
M.Sc. Physics — IIT Kanpur, India (1993-95)
Ph.D. Physics — TIFR, Mumbai, India (1995-2000)
Post-Doctoral Fellow — Brandeis University, USA (2000-02)
Post-Doctoral Fellow — Orsay, University Paris Sud, France (2002-03)
Faculty — IIT Bombay, India (2003- now)
Stochastic processes and Biophysics
16. "Cyclo-Stationary Distribution of mRNA and Protein Counts for Random Cell Division Times",
Syed Yunus Ali, Aditya Saran, Ashok Prasad, Abhyudai Singh, Dibyendu Das,
PRX Life 3, 043002 (2025).
15. "Exact distribution of Quantal content in Synaptic transmission",
Krishna Rijal, Nicolus I C Muller, Eckhard Friauf, Abhyudai Singh, Ashok Prasad, Dibyendu Das,
Phys. Rev. Letts. 132, 228401 (2024).
14. "Exact distribution of threshold crossing times for protein concentrations: implication for Biological timekeeping",
Krishna Rijal, Ashok Prasad, Abhyudai Singh, Dibyendu Das,
Phys. Rev. Lett. 128, 048101 (2022).
13. "Protein hourglass: Exact first passage time distributions for protein thresholds",
Krishna Rijal, Ashok Prasad, Dibyendu Das,
Phys. Rev. E 102, 052413 (2020).
12. "Comparison of mechanisms of kinetochore capture with varying number of spindle microtubules",
Indrani Nayak, Dibyendu Das, Amitabha Nandi,
Phys. Rev. Research 2, 013114 (2020).
11. “First passage of a particle in a potential under stochastic resetting: A vanishing transition of optimal resetting rate”,
Saeed Ahmad, Indrani Nayak, Ajay Bansal, Amitabha Nandi, Dibyendu Das,
Phys. Rev. E 99, 022130 (2019).
10. "Signatures of a macoscopic switching transition for a dynamic microtubule",
J. S. Aparna, Ranjith Padinhateeri, Dibyendu Das,
Scientific Reports 7: 45747 (2017).
9. "Theoretical estimates of exposure timescales of protein binding sites on DNA regulated by nucleosome kinetics",
Jyotsana J. Parmar, Dibyendu Das, Ranjith Padinhateeri,
Nucleic Acids Research 44, 1630 (2016).
8. “Collective force generated by multiple biofilaments can exceed the sum of forces due to individual ones'',
Dipjyoti Das, Dibyendu Das, Ranjith Padinhateeri,
New J. Phys. 16, 063032 (2014) .
Self-Propelled particles
7. "First passage of an active particle in the presence of passive crowders",
Animesh Biswas, J.M. Cruz, P. Parmanada, Dibyendu Das,
Soft Matter 16, 6138 (2020).
6. “Spatial Structures and Giant Number Fluctuations in Models of Active Matter'',
Supravat Dey, Dibyendu Das, R. Rajesh,
Phys. Rev. Lett. 108, 238001 (2012).
Polymer dynamics
5. “Kinetics of polymer tumbling in shear flow: a coarse-grained description”,
Sadhana Singh, R. K. Singh, Dibyendu Das, Sanjay Kumar,
Phys. Rev. E (Rapid. Com.) 99, 030501 (2019)
4. “Accurate statistics of a flexible polymer chain in shear flow'',
Dibyendu Das, Sanjib Sabhapandit,
Phys. Rev. Lett. 101, 188301 (2008).
Granular gases
3. “Energy decay in Three-dimensional freely cooling granular gas'',
Sudhir N. Pathak, Zahera Jabeen, Dibyendu Das, 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).
1. “Violation of Porod law in a freely cooling granular gas in one dimension'',
Mahendra Shinde, Dibyendu Das, R. Rajesh,
Phys. Rev. Lett. 99, 234505 (2007).