47 citations · 273 across the 21 of their papers we have counts for
22 papers
New examples of Property (T) factors with trivial fundamental group and unique prime factorization
Sayan Das
In this paper we provide new examples of property (T) group factors with trivial fundamental group thereby providing more evidence towards Popa's conjecture on triviality of fundam…
Poisson boundaries of II factors
Sayan Das, Jesse Peterson
We introduce Poisson boundaries of II factors with respect to density operators that give the traces. The Poisson boundary is a von Neumann algebra that contains the II fac…
Examples of property (T) II factors with trivial fundamental group
Ionut Chifan, Sayan Das, Cyril Houdayer +1
In this article we provide the first examples of property (T) factors with trivial fundamental group, . Our examples arise as gro…
Floor- or ceiling-sliding for chemically active, gyrotactic, sedimenting Janus particles
Sayan Das, Zohreh Jalilvand, Mihail N. Popescu +3
Surface bound catalytic chemical reactions self-propel chemically active Janus particles. In the vicinity of boundaries, these particles exhibit rich behavior, such as the occurren…
Some Applications of Group Theoretic Rips Constructions to the Classification of von Neumann Algebras
Ionut Chifan, Sayan Das, Krishnendu Khan
In this paper we study various von Neumann algebraic rigidity aspects for the property (T) groups that arise via the Rips construction developed by Belegradek and Osin in geometric…
A holographic superconductor forced through interactions
Pallab Basu, Jyotirmoy Bhattacharya, Sayan Kumar Das
We propose a novel mechanism to achieve superconductivity at zero chemical potential, within the holographic framework. Extending previous construction of the holographic supercond…
Rigidity results for von Neumann algebras arising from mixing extensions of profinite actions of groups on probability spaces
Ionut Chifan, Sayan Das
Motivated by Popa's seminal work \cite{Po04}, in this paper, we provide a fairly large class of examples of group actions satisfying the extended Neshveyev-St…
Electric field- induced Pinch-off of a migrating compound droplet in confined micro channel
Somnath Santra, Sayan Das, Suman Chakraborty
The present study looks into the pinch-off dynamics of a compound droplet, which is suspended in another fluid in a parallel plate microchannel. The droplet is subjected to a trans…
Interfacial viscosity-induced suppression of lateral migration of a surfactant-laden droplet in a non-isothermal Poiseuille flow
Devi Prasad Panigrahi, Somnath Santra, Theneyur Narayanaswamy Banuprasad +2
Understanding and modulating the cross-stream motion of a surfactant-coated droplet in pressure driven flow has great implications in many practical applications. A combination of…
Electrohydrodynamics of compound droplet in a microfluidic confinement
Somnath Santra, Sayan Das, Suman Chakraborty
The present study deals with the dynamics of a double emulsion confined in a microchannel under the presence of a uniform electric field. Towards investigating the non-trivial elec…
Electrohydrodynamic interaction between droplet pairs in confined shear flow
Somnath Santra, Diptendu Sen, Sayan Das +1
The present study deals with the numerical as well as asymptotic analysis of the electrohydrodynamic interaction between two deformable droplets in a confined shear flow. Consideri…
Surfactant-induced-retardation in lateral migration of droplets in a microfluidic confinement
Somnath Santra, Sayan Das, Sankha Shuvra Das +1
In the present study, the role of surfactants on the cross-stream migration of droplets is investigated both experimentally and theoretically. For experimental analysis, sunflower…
A remark on the ultrapower algebra of the hyperfinite factor
Ionut Chifan, Sayan Das
On page 43 in \cite{Po83} Sorin Popa asked whether the following property holds: \emph{If is a free ultrafilter on and is an irre…
Influence of interfacial slip on the suspension rheology of a dilute emulsion of surfactant-laden deformable drops in linear flows
Sayan Das, Anirban Bhattacharjee, Suman Chakraborty
The present study deals with the effect of interfacial slip on the deformation and emulsion rheology of a dilute suspension of droplets in a linear flow. The droplets are laden wit…
Thermally modulated cross-stream migration of a surfactant-laden deformable drop in a Poiseuille flow
Sayan Das, Suman Chakraborty
In the present study, we investigate the cross-stream migration of a deformable droplet suspended in a non-isothermal Poiseuille flow in the presence of bulk-insoluble surfactants.…
Complex Fluid-Fluid Interface may Non Trivially Dictate Droplet Deformation in an Incipient Flow
Sayan Das, Shubhadeep Mandal, Suman Chakraborty
The present study theoretically predicts the effect of interfacial viscosity on the deformation of a compound drop as well as on the bulk rheology. The system at hand comprises of…
An angle between intermediate subfactors and its rigidity
Keshab Chandra Bakshi, Sayan Das, Zhengwei Liu +1
We introduce a new notion of angle between intermediate subfactors and prove various interesting properties of the angle and relate it with the Jones' index. We prove a uniform 60…
Effect of Marangoni stress on the bulk rheology of a dilute emulsion of surfactant-laden deformable droplets in linear flows
Shubhadeep Mandal, Sayan Das, Suman Chakraborty
In the present study we analytically investigate the deformation and bulk rheology of a dilute emulsion of surfactant-laden droplets suspended in a linear flow. We use an asymptoti…
Cross-stream migration characteristics of a deformable droplet in a non-isothermal Poiseuille Flow through Microfluidic Channel
Sayan Das, Shubhadeep Mandal, Suman Chakraborty
The migration characteristics of a suspended deformable droplet in a parallel plate microchannel is studied, both analytically and numerically, under the combined influence of a co…
Cross-stream migration of a surfactant-laden deformable droplet in a Poiseuille flow
Sayan Das, Shubhadeep Mandal, Suman Chakraborty
The motion of a viscous deformable droplet suspended in an unbounded Poiseuille flow in the presence of bulk-insoluble surfactants is studied analytically. Assuming the convective…
Thermocapillary effect on the cross-stream migration of a surfactant-laden droplet in Poiseuille flow
Sayan Das, Shubhadeep Mandal, S. K. Som +1
The motion of a viscous droplet in unbounded Poiseuille flow under the combined influence of bulk-insoluble surfactant and linearly varying temperature field aligned in the directi…
Migration of a surfactant-laden droplet in non-isothermal Poiseuille flow
Sayan Das, Shubhadeep Mandal, S K Som +1
The motion of a surfactant-laden viscous droplet in the presence of background non-isothermal Poiseuille flow is studied analytically and numerically. Specifically, the effect of i…