Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Non-equilibrium systems"”.
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Fluctuation-induced phenomena in non-equilibrium systems
… investigate the implications of fluctuations in systems away, possibly even far, from equilibrium due to their motion either in or out of thermal equilibrium. This subject encompasses several topics in physics including the dynamical Casimir effect in the presence of moving boundaries, and …
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Rare events and dynamics in non-equilibrium systems
… we test our algorithm on a number of benchmark systems. To study the TPE in the finite temperature regime, we develop an MCMC algorithm to sample the infinite-dimensional space of transition paths, which we call the *teleporter MCMC*. The algorithm was designed to efficiently sample the TPEs of …
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Density Fluctuations and Phase Behaviour in Non-Equilibrium Systems
… is an established theoretical framework within equilibrium statistical physics, where the underlying physical laws are microscopically reversible in time. For such systems, the Boltzmann probability distribution explicitly governs the space of all possible configurations, allowing a thorough …
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Pattern formations and relaxation dynamics in non-equilibrium systems
We present an investigation of two non-equilibrium systems: spatial many-species predator-prey games and systems of interacting magnetic skyrmions. We numerically study two predator-prey systems characterized by nested pattern formations. We first consider a six species game in which spiral …
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Fluctuating interfaces and paths in disordered and non-equilibrium systems
… presence of disorder. Specifically, we consider systems in the Kardar-Parisi-Zhang universality class for stochastic interface growth, from the perspectives of both fundamental statistical mechanics and applications to real world problems. We show numerically that the probability distribution …
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Feedback for neuronal system identification
… be generated by a process with a fading memory. Non-equilibrium systems such as neuronal and chaotic models lack a fading memory. Their identification is challenging, in particular in the presence of input noise. In this thesis, we propose a methodology based on the prediction-error method for …
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Local Interactions, Learning and Automata Networks in Games
… theory into the sphere of evolving, potentially non-equilibrium systems. We especially focus our attention on studying the effects of local interactions, using automata networks as a modelling tool. The Chapters 2 and 3 of this dissertation concentrate on applications of the local nature of …
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Non-Equilibrium Pattern Formation in Multi-Species Interacting Particle Systems
Non-equilibrium systems can form complex patterns in their steady states. Examples are systems consisting of self-propelled particles or systems consisting of particles driven away from equilibrium by external energy sources. In steady states, the interacting particles spontaneously organise into …
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Fluctuation Relations for Stochastic Systems far from Equilibrium
Fluctuations are of great importance in systems of small length and energy scales. Measuring the pulling of single molecules or the stationary fiow of mesospheres dragged through a viscous media enables the direct analysis of work and entropy distributions. These probability distributions are the …
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Study of Critical Phenomena with Monte Carlo and Machine Learning Techniques
Dynamical properties of non-equilibrium systems, similar to equilibrium ones, have been shown to obey robust time scaling laws which have enriched the concept of physical universality classes. In the first part of this Dissertation, we present the results of our investigations of some of the …
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Exploring Interacting Bose Gases in and out of Equilibrium
… ultracold Bose gases, both in and out of equilibrium. Our experiments are performed using a gas of $^{39}$K or $^{87}$Rb confined in the uniform potential of an optical box trap, a novel testbed for quantum many-body phenomena. Our work focuses on weakly interacting non-equilibrium …
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Relaxation and Spontaneous Ordering in Systems with Competition
Spontaneous order happens in non-equilibrium systems composed of interacting elements. This phenomenon manifests in both the formation of space-time patterns in reaction-diffusion systems and collective rhythmic behaviors in coupled oscillators. In this thesis, we present the results of two …
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Asymmetric Structures in Systems of Non-equilibrium Bose-Einstein Condensates
… we investigate the nature and applications of systems of interacting Bose-Einstein condensates. The focus of the work is on non-equilibrium condensates that exist within gain-dissipative systems, such as polaritonic or photonic condensates. We first elucidate the nature of an “asymmetric dyad”. …
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A study of the effects of spatially localized time-delayed feedback schemes on spatio-temporal patterns
… spatio-temporal chaos, spatially extended systems were subjected to protocols that perturbed them as a whole, often overlooking the potential stabilizing interaction between adjacent regions. We have shown that through the application of a time-delayed feedback scheme to a specific …
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Work, power, and resetting statistics in stochastic models of physical systems under drive
In this thesis, I investigate various non-equilibrium systems and analyse statistics relating to thermodynamic and rheological observables. I start by theoretically considering a cyclically driven engine, analogous to those used in the formulation of classical thermodynamics, which instead uses an …
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History Induced Critical Scaling in Disordered Media and Super Diffusive Growth in Highly Advective Random Environments
The behavior of non-equilibrium systems in the presence of quenched random disorder is studied. In noisy, hysteretic systems, the role of driving force history is studied in the context of the non-equilibrium, zero-temperature Random Field Ising Model (RFIM). The RFIM was originally developed as a …
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Steady State Properties of Some Driven Diffusive Systems
… of the properties and critical behavior of non-equilibrium systems, we investigate the steady state properties of three simple models, variations of the prototype, the driven Ising lattice gas. Our first system studied is the bilayer model, a stack of two driven Ising lattice gases allowed …
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Controlling non-equilibrium dynamics in lattice gas models
… a new interesting research avenue has emerged in non-equilibrium statistical physics, namely studies of collective responses in spatially inhomogeneous systems. Whereas substantial progress has been made in understanding the origins and the often universal nature of cooperative behavior in systems …
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Dynamic weakening and trained memory in avalanche dynamics from high-entropy alloys to neurons and spin systems
… energy under slow external driving—arise in systems ranging from earthquakes and crystalline solids to neuronal networks and spin models. Despite differences in microscopic mechanisms, these systems share universal features such as broad event-size distributions and scale-invariant critical …
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Symmetry and its Signatures in Quantum Many-Body Dynamics
… in our understanding of statistical or manybody systems. By making appeals to universal properties associated with global symmetries and topology, one may describe universal properties of “typical” states and dynamics in equilibrium, even when keeping track of the precise dynamics of a particular …
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