51 citations · 686 across the 50 of their papers we have counts for
20 papers · 1 filter
Traveling waves, phase separation and pattern formation in the active stepping stone model
Rashmiranjan Bhutia, Prasad Perlekar, Kabir Ramola
Selective advantage leads to the proliferation of a species into an ecosystem. On the other hand, self-propulsion can lead to dynamic clustering of individuals. To analyze the intr…
A constitutive model for discontinuous shear thickening in epithelial tissues
Tanmoy Ghosh, Kabir Ramola, Saroj Kumar Nandi
The rheological properties of biological tissues, though fundamental to many physiological and pathological processes such as embryonic development, wound healing, and tumor progre…
Stress Response of Jammed Solids: Prestress and Screening
Surajit Chakraborty, Jishnu N. Nampoothiri, Subhro Bhattacharjee +2
Unlike classical elasticity, where stresses arise from deformations relative to a stress-free reference configuration, rigidity in amorphous systems is maintained by disordered for…
Instabilities govern the low-frequency vibrational spectrum of amorphous solids
Surajit Chakraborty, Roshan Maharana, Smarajit Karmakar +1
Amorphous solids exhibit an excess of low-frequency vibrational modes beyond the Debye prediction, contributing to their anomalous mechanical and thermal properties. Although a $ω^…
Long-Range Correlations in Elastic Moduli and Local Stresses at the Unjamming Transition
Surajit Chakraborty, Kabir Ramola
We explore the behavior of spatially heterogeneous elastic moduli as well as the correlations between local moduli in model solids with short-range repulsive potentials. We show th…
Universal stress correlations in crystalline and amorphous packings
Roshan Maharana, Debankur Das, Pinaki Chaudhuri +1
We present a universal characterization of stress correlations in athermal systems, across crystalline to amorphous packings. Via numerical analysis of static configurations of par…
Stress correlations in near-crystalline packings
Roshan Maharana, Kabir Ramola
We derive exact results for stress correlations in near-crystalline systems in two and three dimensions. We study energy minimized configurations of particles interacting through H…
Enhanced Vibrational Stability in Glass Droplets
Surajit Chakraborty, Vishnu V. Krishnan, Kabir Ramola +1
We show through simulations of amorphous solids prepared in open boundary conditions that they possess significantly fewer low-frequency vibrational modes compared to their periodi…
Tensor Electromagnetism and Emergent Elasticity in Jammed Solids
Jishnu N. Nampoothiri, Michael D'Eon, Kabir Ramola +2
The theory of mechanical response and stress transmission in disordered, jammed solids poses several open questions of how non-periodic networks -- apparently indistinguishable fro…
First contact breaking distributions in strained disordered crystals
Roshan Maharana, Jishnu N. Nampoothiri, Kabir Ramola
We derive exact probability distributions for the strain () at which the first stress drop event occurs in uniformly strained disordered crystals, with quenched disorder introdu…
Emergent power-law interactions in disordered crystals
Pappu Acharya, Debankur Das, Surajit Sengupta +1
We derive exact results for the fluctuations in energy produced by microscopic disorder in near-crystalline athermal systems. Our formalism captures the heterogeneity in the elasti…
Disorder Perturbation Expansion for Athermal Crystals
Pappu Acharya, Debankur Das, Kabir Ramola
We introduce a perturbation expansion for athermal systems that allows an exact determination of displacement fields away from the crystalline state as a response to disorder. We s…
Long-range correlations in pinned athermal networks
Debankur Das, Pappu Acharya, Kabir Ramola
We derive exact results for displacement fields that develop as a response to external pinning forces in two dimensional athermal networks. For a triangular lattice arrangement of…
Athermal fluctuations in disordered crystals
Pappu Acharya, Surajit Sengupta, Bulbul Chakraborty +1
We analyze the fluctuations in particle positions and inter-particle forces in disordered jammed crystals in the limit of weak disorder. We demonstrate that such athermal systems a…
Arrested States in Persistent Active Matter: Gelation without Attraction
Carl Merrigan, Kabir Ramola, Rakesh Chatterjee +3
We explore phase separation and kinetic arrest in a model active colloidal system consisting of self-propelled, hard-core particles with nonconvex shapes. The passive limit of the…
Timescale divergence at the shear jamming transition
H. A. Vinutha, Kabir Ramola, Bulbul Chakraborty +1
We find that in simulations of quasi-statically sheared frictional disks, the shear jamming transition can be characterized by an abrupt jump in the number of force bearing contact…
Motion of active tracer in a lattice gas with cross-shaped particles
Rakesh Chatterjee, Nimrod Segall, Carl Merrigan +3
We analyze the dynamics of an active tracer particle embedded in a thermal lattice gas. All particles are subject to exclusion up to third nearest neighbors on the square lattice,…
Microscopic origin of frictional rheology in dense suspensions: correlations in force space
Jetin E. Thomas, Kabir Ramola, Abhinendra Singh +3
We develop a statistical framework for the rheology of dense, non-Brownian suspensions, based on correlations in a space representing forces, which is dual to position space. Worki…
Shear-induced organization of forces in dense suspensions: signatures of discontinuous shear thickening
Sumantra Sarkar, Elan Shatoff, Kabir Ramola +3
Dense suspensions can exhibit an abrupt change in their viscosity in response to increasing shear rate. The origin of this discontinuous shear thickening (DST) has been ascribed to…
Numerical test of the Edwards conjecture shows that all packings are equally probable at jamming
Stefano Martiniani, K. Julian Schrenk, Kabir Ramola +2
In the late 1980s, Sam Edwards proposed a possible statistical-mechanical framework to describe the properties of disordered granular materials. A key assumption underlying the the…