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Birkhäuser - Birkhäuser Applied Probability and Statistics | Schrödinger Diffusion Processes

Schrödinger Diffusion Processes

Aebi, Robert

1996, 186p.

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  • About this book

In 1931 Erwin Schrödinger considered the following problem: A huge cloud of independent and identical particles with known dynamics is supposed to be observed at finite initial and final times. What is the "most probable" state of the cloud at intermediate times? The present book provides a general yet comprehensive discourse on Schrödinger's question. Key roles in this investigation are played by conditional diffusion processes, pairs of non-linear integral equations and interacting particles systems. The introductory first chapter gives some historical background, presents the main ideas in a rather simple discrete setting and reveals the meaning of intermediate prediction to quantum mechanics. In order to answer Schrödinger's question, the book takes three distinct approaches, dealt with in separate chapters: transformation by means of a multiplicative functional, projection by means of relative entropy, and variation of a functional associated to pairs of non-linear integral equations. The book presumes a graduate level of knowledge in mathematics or physics and represents a relevant and demanding application of today's advanced probability theory.

Content Level » Research

Keywords » Brownian motion - Finite - Morphism - Probability theory - Topology - diffusion process - equation - function - mathematics - product measure

Related subjects » Birkhäuser Applied Probability and Statistics - Birkhäuser Mathematics

Table of contents 

1 Schrödinger’s View of Natural Laws.- 1.1 Most probable realizations.- 1.2 A large deviation approach.- 1.3 Prediction from past and future.- 1.4 An analogy to wave functions.- 1.5 Two representations of diffusions.- 1.6 Identification of drift.- 2 Diffusions with Singular Drift.- 2.1 Schrödinger equations.- 2.2 Non-smooth Schrödinger multipliers.- 2.3 Singular transformation of diffusions.- 2.4 Schrödinger processes.- 3 Integral and Diffusion Equations.- 3.1 Generators and transition densities.- 3.2 Feynman-Kac integral equations.- 3.3 ‘Killed’ integral equations.- 3.4 Equivalence of solutions.- 4 Itô’s Formula for Non-Smooth Functions.- 4.1 Meaning and generalization.- 4.2 Driving Brownian motion.- 4.3 Driving flows of diffeomorphisms.- 5 Large Deviations.- 5.1 Approximate Sanov property.- 5.2 Csiszar’s projection and ?0-topology.- 6 Interacting Diffusion Processes.- 6.1 Eddington-Schrödinger prediction.- 6.2 Limiting distributions.- 6.3 Propagation of chaos in entropy.- 6.4 Renormalization procedures.- 6.5 Conditions on creation and killing.- 7 Schrödinger Systems.- 7.1 Non-linear integral equations.- 7.2 Product measure endomorphisms.- 7.3 A variational principle for local adjoints.- 7.4 Construction of solutions.- References.

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