Constraints on background torsion from birefringence of CMB polarization (2009)
Das, Moumita, Mohanty, Subhendra, Prasanna, A. R.
We show that a non-minimal coupling of electromagnetism with background torsion can produce birefringence of the electromagnetic waves. This birefringence gives rise to a B-mode polarization of the...
Buckling and force propagation along intracellular microtubules (2007)
Das, Moumita, Levine, Alex J., MacKintosh, F. C.
Motivated by recent experiments showing the buckling of microtubules in cells, we study theoretically the mechanical response of, and force propagation along elastic filaments embedded in a...
Effective medium theory of semiflexible filamentous networks (2006)
Das, Moumita, MacKintosh, F. C., Levine, Alex
We develop an effective medium approach to the mechanics of disordered, semiflexible polymer networks and study the response of such networks to uniform and nonuniform strain. We identify distinct...
Persistence of a pinch in a pipe (2006)
Mahadevan, L., Vaziri, A., Das, Moumita
The response of low-dimensional solid objects combines geometry and physics in unusual ways, exemplified in structures of great utility such as a thin-walled tube that is ubiquitous in nature and...
Brownian-drag induced particle current in a model colloidal system (2006)
Das, Moumita, Ramaswamy, Sriram, Sood, AK, Ananthakrishna, G
We numerically study the behavior of a collection of overdamped Brownian particles in a channel, in the presence of a flow field applied on similar but slower particles in a wide chamber in contact...
Curvature condensation and bifurcation in an elastic shell (2006)
Das, Moumita, Vaziri, Ashkan, Kudrolli, Arshad, Mahadevan, L.
We study the formation and evolution of localized geometrical defects in an indented cylindrical elastic shell using a combination of experiment and numerical simulation. We find that as a symmetric...
Flow-induced currents in nanotubes: a Brownian dynamics approach (2005)
Das, Moumita, Ramaswamy, Sriram, Sood, A. K., Ananthakrishna, G.
Motivated by recent experiments [Science {\bf 299}, 1042 (2003)] reporting that carbon nanotubes immersed in a flowing fluid displayed an electric current and voltage, we numerically study the...
Routes to spatiotemporal chaos in the rheology of nematogenic fluids (2005)
Das, Moumita, Chakrabarti, Buddhapriya, Dasgupta, Chandan, Ramaswamy, Sriram, Sood, AK
With a view to understanding the rheochaos observed in recent experiments in a variety of orientable fluids, we study numerically the equations of motion of the spatiotemporal evolution of the...
Routes to spatiotemporal chaos in the rheology of nematogenic fluids (2005)
Das, Moumita, Chakrabarti, Buddhapriya, Dasgupta, Chandan, Ramaswamy, Sriram, Sood, AK
With a view to understanding the rheochaos observed in recent experiments in a variety of orientable fluids, we study numerically the equations of motion of the spatiotemporal evolution of the...
Solar influence on the Indian summer monsoon during the Holocene (2005)
Anil K. Gupta, Moumita Das, David M. Anderson, M. Das, D. M. Anderson
[1] The large (8%) changes in the past seasonal insolation have a well-documented influence on the Indian summer monsoon. However, the effect of the small (<1%) decade to century scale solar...
Routes to spatiotemporal chaos in the rheology of nematogenic fluids (2004)
Das, Moumita, Chakrabarti, Buddhapriya, Dasgupta, Chandan, Ramaswamy, Sriram, Sood, A. K.
With a view to understanding the ``rheochaos'' observed in recent experiments in a variety of orientable fluids, we study numerically the equations of motion of the spatiotemporal evolution of the...
Spatiotemporal Rheochaos in Nematic Hydrodynamics (2004)
Chakrabarti, Buddhapriya, Das, Moumita, Dasgupta, Chandan, Ramaswamy, Sriram, Sood, AK
Motivated by recent observations of rheochaos in sheared wormlike micelles, we study the coupled nonlinear partial differential equations for the hydrodynamic velocity and order-parameter fields in a...
Spatiotemporal Rheochaos in Nematic Hydrodynamics (2004)
Chakrabarti, Buddhapriya, Das, Moumita, Dasgupta, Chandan, Ramaswamy, Sriram, Sood, AK
Motivated by recent observations of rheochaos in sheared wormlike micelles, we study the coupled nonlinear partial differential equations for the hydrodynamic velocity and order-parameter fields in a...
Collective stochastic resonance in shear-induced melting of sliding bilayers (2003)
Das, Moumita, Ananthakrishna, G, Ramaswamy, Sriram
The far-from-equilibrium dynamics of two crystalline two-dimensional monolayers driven past each other is studied using Brownian dynamics simulations. While at very high and low driving rates the...
Spatiotemporal rheochaos in nematic hydrodynamics (2003)
Chakrabarti, Buddhapriya, Das, Moumita, Dasgupta, Chandan, Ramaswamy, Sriram, Sood, A. K.
Motivated by the observation of rheochaos in sheared wormlike micelles [Bandyopadhyay et al., Phys. Rev. Lett, 84 2022, (2000); Europhys. Lett. 56, 447 (2001); Pramana 53, 223 (1999)] we study the...
Collective stochastic resonance in shear-induced melting of sliding bilayers (2003)
Das, Moumita, Ananthakrishna, G., Ramaswamy, Sriram
The far-from-equilibrium dynamics of two crystalline two-dimensional monolayers driven past each other is studied using Brownian dynamics simulations. While at very high and low driving rates the...
Collective stochastic resonance in shear-induced melting of sliding bilayers (2003)
Das, Moumita, Ananthakrishna, G, Ramaswamy, Sriram
The far-from-equilibrium dynamics of two crystalline two-dimensional monolayers driven past each other is studied using Brownian dynamics simulations. While at very high and low driving rates the...
Melting-freezing cycles in a relatively sheared pair of crystalline monolayers (2002)
Das, Moumita, Ramaswamy, Sriram, Ananthakrishna, G.
The nonequilibrium dynamical behaviour that arises when two ordered two-dimensional monolayers of particles are sheared over each other is studied in Brownian dynamics simulations. A curious sequence...