Quantum Fields and Processes A Combinatorial Approach 1st Edition John Gough 1108271502 9781108271509

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Product details:

• ISBN 10: 1108271502
• ISBN 13: 9781108271509
• Author: John Gough

Wick ordering of creation and annihilation operators is of fundamental importance for computing averages and correlations in quantum field theory and, by extension, in the Hudson–Parthasarathy theory of quantum stochastic processes, quantum mechanics, stochastic processes, and probability. This book develops the unified combinatorial framework behind these examples, starting with the simplest mathematically, and working up to the Fock space setting for quantum fields. Emphasizing ideas from combinatorics such as the role of lattice of partitions for multiple stochastic integrals by Wallstrom–Rota and combinatorial species by Joyal, it presents insights coming from quantum probability. It also introduces a ‘field calculus’ which acts as a succinct alternative to standard Feynman diagrams and formulates quantum field theory (cumulant moments, Dyson–Schwinger equation, tree expansions, 1-particle irreducibility) in this language. Featuring many worked examples, the book is aimed at mathematical physicists, quantum field theorists, and probabilists, including graduate and advanced undergraduate students.

Table of contents:

1 Introduction to Combinatorics

2 Probabilistic Moments and Cumulants

3 Quantum Probability

4 Quantum Fields

5 Combinatorial Species

6 Combinatorial Aspects of Quantum Fields: Feynman Diagrams

7 Entropy, Large Deviations, and Legendre Transforms

8 Introduction to Fock Spaces

9 Operators and Fields on the Boson Fock Space

10 L[sup(2)]-Representations of the Boson Fock Space

11 Local Fields on the Boson Fock Space: Free Fields

12 Local Interacting Boson Fields

13 Quantum Stochastic Calculus

14 Quantum Stochastic Limits

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