Get Brownian Agents and Active Particles: Collective Dynamics in PDF

By Frank Schweitzer

ISBN-10: 3540439382

ISBN-13: 9783540439387

This publication lays out a imaginative and prescient for a coherent framework for knowing advanced systems'' (from the foreword by way of J. Doyne Farmer). through constructing the real suggestion of Brownian brokers, the writer combines ideas from informatics, resembling multiagent platforms, with methods of statistical many-particle physics. this manner, a good process for computing device simulations of complicated platforms is built that's additionally available to analytical investigations and quantitative predictions. The booklet demonstrates that Brownian agent types may be effectively utilized in lots of varied contexts, starting from physicochemical development formation, to energetic movement and swarming in organic structures, to self-assembling of networks, evolutionary optimization, city development, fiscal agglomeration or even social platforms.

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Example text

To interact actively with its environment or other agents, but may respond only passively to external forces that might be imposed on it, like a “physical” particle. We note that Brownian agents with just an internal energy depot in this book are mainly called active particles – if other, agent features will be neglected. This means a rather “simple” type of agent that does not deny its origin from the physical world, and therefore has also been denoted as a particle agent [124]. Noteworthy, the different (external or internal) state variables can change in the course of time, either due to impacts from the surroundings or due to internal dynamics.

2 Brownian Agents 29 diffusion equation: ∂ hθ (r, t) = ∂t N si δθ,θi δ(r − r i ) − kθ hθ (r, t) + Dθ ∆hθ (r, t). 14), every agent contributes permanently to the communication field with its personal “strength” of information si . Here, δθ,θi is the Kronecker delta indicating that the agents contribute only to the field component that matches their internal parameter θi . δ(r − ri ) means Dirac’s delta function used for continuous variables, which indicates that agents contribute to the field only at their current position ri .

Other CA-based examples describe the evolution of support networks [205], group decisions in Ising-like models [166, 277], and also influences of social impact [300, 353] and collective opinion formation [261, 262] (see also Chap. 10). Moreover, many game-theoretical models have been simulated by CA [1, 246, 302, 371, 372]. 1 Introduction to Agent-Based Modeling 19 ement, in a CA approach, this is not described as a motion of the element itself, but indirectly as a consecutive number of cells that become occupied and are assigned specific state variables for a short time before transiting back to their empty state.

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Brownian Agents and Active Particles: Collective Dynamics in the Natural and Social Sciences by Frank Schweitzer


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