153 citations · 668 across the 43 of their papers we have counts for
42 papers · 1 filter
Current fluctuations in a gas of active Ornstein-Uhlenbeck particles
Sandeep Jangid, Aman Kumbhakar, Juliane U. Klamser +1
We investigate the statistics of the time-integrated current in an infinite one-dimensional gas of independent active Ornstein--Uhlenbeck particles, as a model system for studying…
Macroscopic fluctuation theory for the multi-time statistics of current in non-stationary diffusive systems
Sabyasachi Chowdhury, Kapil Sharma, Sandeep Jangid +1
The statistics of current fluctuations has long been a central object of study in non-equilibrium physics. Most existing work has focused on one-time statistics, while their multi-…
An exactly solvable macroscopic fluctuation theory of single-file diffusion
Sandeep Jangid, Soumyabrata Saha, Kapil Sharma +4
Single-file diffusion is a ubiquitous phenomenon in low-dimensional systems, arising in transport inside narrow channels. Its natural continuum model is a one-dimensional gas of ex…
Effect of slow bonds on current fluctuations in the symmetric simple exclusion process
Soumyabrata Saha, Sandeep Jangid, Kapil Sharma +1
The symmetric simple exclusion process (SSEP) is a paradigmatic model of classical non-equilibrium dynamics. Exact results for large deviations of particle current in the SSEP have…
Universal tracer statistics in single-file transport
Soumyabrata Saha, Jitendra Kethepalli, Benjamin Guiselin +2
We uncover an emergent universality in the large-scale, long-time statistics of a one-dimensional hard-rod gas evolving under two fundamentally different classes of microscopic dyn…
A bottom-up approach to fluctuating hydrodynamics: Coarse-graining of stochastic lattice gases and the Dean-Kawasaki equation
Soumyabrata Saha, Sandeep Jangid, Thibaut Arnoulx de Pirey +2
Fluctuating hydrodynamics provides a quantitative, large-scale description of many-body systems in terms of smooth variables, with microscopic details entering only through a small…
Optimal navigation in a noisy environment
Abhijit Sinha, Sandeep Jangid, Tridib Sadhu +1
Navigating toward a known target in a noisy environment is a fundamental problem shared across biological, physical, and engineered systems. Although optimal strategies are often f…
Ballistic macroscopic fluctuation theory via mapping to point particles
Jitendra Kethepalli, Andrew Urilyon, Tridib Sadhu +1
Ballistic Macroscopic Fluctuation Theory (BMFT) captures the evolution of fluctuations and correlations in systems where transport is strictly ballistic. We show that, for \emph{ge…
Steady-state density large deviations in driven diffusive systems
Soumyabrata Saha, Tridib Sadhu
A diffusive system coupled to boundary reservoirs reaches a non-equilibrium steady state whose density fluctuations can exhibit correlations over macroscopic distances. While curre…
Dynamical phase transitions in certain non-ergodic stochastic processes
Yogeesh Reddy Yerrababu, Satya N. Majumdar, Benjamin Guiselin +1
We present a class of stochastic processes in which the large deviation functions of time-integrated observables exhibit singularities that relate to dynamical phase transitions of…
Hydrodynamics of a hard-core active lattice gas
Ritwik Mukherjee, Soumyabrata Saha, Tridib Sadhu +2
We present a fluctuating hydrodynamic description of an active lattice gas model with excluded volume interactions that exhibits motility-induced phase separation under appropriate…
Large deviations of current for the symmetric simple exclusion process on a semi-infinite line, and on an infinite line with a slow bond
Kapil Sharma, Soumyabrata Saha, Sandeep Jangid +1
Two influential exact results in classical one-dimensional diffusive transport are about current statistics for the symmetric simple exclusion process: one in the stationary state…
Large Deviations in the Symmetric Simple Exclusion Process with Slow Boundaries: A Hydrodynamic Perspective
Soumyabrata Saha, Tridib Sadhu
We revisit the one-dimensional model of the symmetric simple exclusion process slowly coupled with two unequal reservoirs at the boundaries. In its non-equilibrium stationary state…
Current fluctuations in a semi-infinite line
Soumyabrata Saha, Tridib Sadhu
We present the application of a fluctuating hydrodynamic theory to study current fluctuations in diffusive systems on a semi-infinite line in contact with a reservoir with slow cou…
Large deviations of a tracer position in the dense and the dilute limits of a single-file diffusion
Jagannath Rana, Tridib Sadhu
We apply the macroscopic fluctuation theory to analyze the long-time statistics of the position of a tracer in the dense and the dilute limits of diffusive single-file systems. Our…
Sequence of phase transitions in a model of interacting rods
Juliane U. Klamser, Tridib Sadhu, Deepak Dhar
In a system of interacting thin rigid rods of equal length on a two-dimensional grid of lattice spacing , we show that there are multiple phase transitions as the coupl…
Functionals of fractional Brownian motion and the three arcsine laws
Tridib Sadhu, Kay Jörg Wiese
Fractional Brownian motion is a non-Markovian Gaussian process indexed by the Hurst exponent , generalising standard Brownian motion to account for anomalous diffusion.…
Large deviations in the symmetric simple exclusion process with slow boundaries
Bernard Derrida, Ori Hirschberg, Tridib Sadhu
We obtain the exact large deviation functions of the density profile and of the current, in the non-equilibrium steady state of a one dimensional symmetric simple exclusion process…
Large deviations conditioned on large deviations II: Fluctuating hydrodynamics
Bernard Derrida, Tridib Sadhu
For diffusive many-particle systems such as the SSEP (symmetric simple exclusion process) or independent particles coupled with reservoirs at the boundaries, we analyze the density…
Large deviations conditioned on large deviations I: Markov chain and Langevin equation
Bernard Derrida, Tridib Sadhu
We present a systematic analysis of stochastic processes conditioned on an empirical measure defined in a time interval for large . We build our analysis starting…
Multiple singularities of the equilibrium free energy in a one-dimensional model of soft rods
Sushant Saryal, Juliane U. Klamser, Tridib Sadhu +1
There is a misconception, widely shared amongst physicists, that the equilibrium free energy of a one-dimensional classical model with strictly finite-ranged interactions, and at n…
Generalized arcsine laws for fractional Brownian motion
Tridib Sadhu, Mathieu Delorme, Kay Jörg Wiese
The three arcsine laws for Brownian motion are a cornerstone of extreme-value statistics. For a Brownian starting from the origin, and evolving during time , one considers…
Emergence and complexity in theoretical models of self-organized criticality
Tridib Sadhu
In this thesis we present few theoretical studies of the models of self-organized criticality. Following a brief introduction of self-organized criticality, we discuss three main p…
Correlations of the density and of the current in non-equilibrium diffusive systems
Tridib Sadhu, Bernard Derrida
We use fluctuating hydrodynamics to analyze the dynamical properties in the non-equilibrium steady state of a diffusive system coupled with reservoirs. We derive the two-time corre…