72 citations · 184 across the 26 of their papers we have counts for
26 papers
Co-rotating Vortices on Surfaces of Variable Negative Curvature: Hamiltonian Structure and Curvature-Induced Drift
Gaurang Mangesh Joshi, Rickmoy Samanta
Vortices in fluids and superfluids are fundamental to phenomena ranging from Bose-Einstein condensates and superfluid films to neutron stars and hydrodynamic micro-rotors, where ba…
Quenched Dipole Pairs in Viscous Fluid Membranes across the Saffman Crossover: Integrable Hamiltonian Dynamics
Satyagni Bhattacharya, Debdatta Dey, Samyak Jain +7
We investigate an analytic theory of force-dipole hydrodynamics in a viscous membrane coupled to an infinite surrounding fluid, focusing on quenched (orientation-fixed) dipoles. Wh…
Dissipative Vortex Binaries in Compact Fluid Domains with Geometric Corrections
Aswathy K. R., Rickmoy Samanta
We study a dissipative extension of vortex-binary motion in a doubly periodic fluid domain. The underlying conservative system admits an exact integrable reduction to a single comp…
Collective Dynamics of Vortex Clusters in Compact Fluid Domains: From Pair Interactions to a Quadrupole Description
Aswathy KR, Rickmoy Samanta
Clusters of co-rotating vortices on compact fluid domains exhibit a simple collective dynamics, combining coherent global rotation with a slow breathing of the cluster size. In thi…
Force Dipole Interactions in Membranes with Odd Viscosity
Sneha Krishnan, Udaya Maurya, Rickmoy Samanta
We develop a hydrodynamic framework for the interactions and collective dynamics of force dipoles embedded in a compressible fluid membrane supported by a shallow viscous subphase.…
Post-Newtonian Dynamics of Radiating Charges: Canonical Formulation and Binary Inspiral Laws
Suhani Verma, Siddarth Mediratta, Nanditha Kilari +18
We revisit an explicit electromagnetic analogue of the Post Newtonian Hamiltonian framework widely used in gravitational wave physics. Starting from the Lorentz Dirac equation, we…
Hamiltonian Active Particles in Incompressible Fluid Membranes
Sneha Krishnan, Rickmoy Samanta
Active proteins and membrane-bound motors exert force dipole flows along fluid interfaces and lipid bilayers. We develop a Hamiltonian framework for the interactions of pusher and…
A Self Propelled Vortex Dipole Model on Surfaces of Variable Negative Curvature
Khushi Banthia, Rickmoy Samanta
We investigate vortex dipoles on surfaces of variable negative curvature, focusing on a catenoid of arbitrary throat radius as a concrete example. We construct the effective dynami…
Dynamics of Vortex Clusters on a Torus
Aswathy K R, Udaya Maurya, Surya Teja Gavva +1
We investigate the collective dynamics of multivortex assemblies in a two dimensional (2D) toroidal fluid film of distinct curvature and topology. The incompressible and inviscid n…
Redshift-space galaxy bispectrum in presence of massive neutrinos: A multipole expansion approach for Euclid
Sourav Pal, Debanjan Sarkar, Rickmoy Samanta +1
Massive neutrinos imprint distinctive signatures on the evolution of cosmic structures, notably suppressing small-scale clustering. We investigate the impact of massive neutrinos o…
Vortex Dynamics in Tubular Fluid Membranes
Udaya Maurya, Surya Teja Gavva, Arpan Saha +1
Thin cylindrical membranes arise in a wide variety of biological systems ranging from tubular structures on and within cell membranes to in-vitro experiments on artificial vesicles…
Exploring neutrino interactions in light of present and upcoming galaxy surveys
Sourav Pal, Rickmoy Samanta, Supratik Pal
In the standard cosmological framework, neutrinos begin to free-stream after the weak interaction phase ends in the early universe, at a temperature of approximately $T \sim 1 \, {…
Near-horizon chaos beyond Einstein gravity
Surajit Das, Surojit Dalui, Rickmoy Samanta
We investigate chaos in the dynamics of massless particles near the horizon of static spherically symmetric black holes in two well-motivated models of gravity. In both thes…
Revisiting coupled CDM-massive neutrino perturbations in diverse cosmological backgrounds
Sourav Pal, Rickmoy Samanta, Supratik Pal
Massive neutrinos are well-known to cause a characteristic suppression in the growth of structures at scales below the neutrino free-streaming length. A detailed understanding of t…
Force Dipole Interactions in Tubular Fluid Membranes
Samyak Jain, Rickmoy Samanta
We construct viscous fluid flow sourced by a force dipole embedded in a cylindrical fluid membrane, coupled to external embedding fluids. We find analytic expressions for the flow,…
Closed-form solutions of spinning, eccentric binary black holes at 1.5 post-Newtonian order
Rickmoy Samanta, Sashwat Tanay, Leo C. Stein
The closed-form solution of the 1.5 post-Newtonian (PN) accurate binary black hole (BBH) Hamiltonian system has proven to be difficult to obtain for a long time since its introduct…
Dynamics of Force Dipoles in Curved Biological Membranes
Sarthak Bagaria, Rickmoy Samanta
We construct a model to explore the hydrodynamic interactions of active inclusions in curved biological membranes. The curved membrane is modelled as a two dimensional layer of hig…
Vortex Flows and Streamline Topology in Curved Biological Membranes
Rickmoy Samanta, Naomi Oppenheimer
When considering flows in biological membranes, they are usually treated as flat, though more often than not, they are curved surfaces, even extremely curved, as in the case of the…
Viscosity for Anisotropic Reissner Nordström Blackbranes
Soumangsu Chakraborty, Rickmoy Samanta
We investigate the behavior of shear viscosity in the presence of small anisotropy and a finite chemical potential. First, we construct an anisotropic Reissner Nordstr{ö}m blackbra…
A Proposal for measuring Anisotropic Shear Viscosity in Unitary Fermi Gases
Rickmoy Samanta, Rishi Sharma, Sandip P. Trivedi
We present a proposal to measure anisotropic shear viscosity in a strongly interacting, ultra-cold, unitary Fermi gas confined in a harmonic trap. We introduce anisotropy in this s…
On the Supersymmetry of Bianchi attractors in Gauged supergravity
Bidisha Chakrabarty, Karthik Inbasekar, Rickmoy Samanta
Bianchi attractors are near horizon geometries with homogeneous symmetries in the spatial directions. We construct supersymmetric Bianchi attractors in gauge…
The Shear Viscosity in an Anisotropic Unitary Fermi Gas
Rickmoy Samanta, Rishi Sharma, Sandip P. Trivedi
We consider a system consisting of a strongly interacting, ultracold unitary Fermi gas under harmonic confinement. Our analysis suggests the possibility of experimentally studying,…
Looking for lepton flavour violation in supersymmetry at the LHC
Monoranjan Guchait, Abhishek M. Iyer, Rickmoy Samanta
We consider models of supersymmetry which can incorporate sizeable mixing between different generations of sfermions. While the mixing is constrained by the non-observation of vari…
The Shear Viscosity in Anisotropic Phases
Sachin Jain, Rickmoy Samanta, Sandip P. Trivedi
We construct anisotropic black brane solutions and analyse the behaviour of some of their metric perturbations. These solutions correspond to field theory duals in which rotational…