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1. |
Record Nr. |
UNINA9910782394603321 |
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Autore |
Kleinert Hagen |
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Titolo |
Critical properties of [Greek letter phi]4-theories [[electronic resource] /] / Hagen Kleinert, Verena Schulte-Frohlinde |
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Pubbl/distr/stampa |
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River Edge, N.J., : World Scientific, c2001 |
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ISBN |
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1-281-95148-X |
9786611951481 |
981-279-994-X |
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Descrizione fisica |
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1 online resource (512p.) |
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Altri autori (Persone) |
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Disciplina |
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Soggetti |
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Perturbation (Quantum dynamics) |
Physics |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Bibliographic Level Mode of Issuance: Monograph |
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Nota di bibliografia |
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Includes bibliographical references and index. |
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Nota di contenuto |
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Definition of [phi]4-Theory; Feynman Diagrams; Diagrams in Momentum Space; Structural Properties of Perturbation Theory; Diagrams for Multicomponent Fields; Scale Transformations of Fields and Correlation Functions; Regularization of Feynman Integrals; Renormalization; Renormalization Group; Recursive Subtraction of UV-Divergences via R-Operation; Zero-Mass Approach to Counterterms; Calculation of Momentum Space Integrals; Generation of Diagrams; Results of the Five-Loop Calculation; Basic Resummation Theory; Critical Exponents of O(N)-Symmetric Theory; Cubic Anisotropy; Variational Perturbation Theory; Critical Exponents from Other Expansions; New Resummation Algorithm; Conclusion: Diagrammatic R-Operation Up to Five Loops; Contributions to Renormalization-Constants. |
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Sommario/riassunto |
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This work explains in detail how to perform perturbation expansions in quantum field theory to high orders, and how to extract the critical properties of the theory from the resulting divergent power series. |
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2. |
Record Nr. |
UNINA9910637713003321 |
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Autore |
Arendt Wolfgang <1950-> |
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Titolo |
Partial Differential Equations : An Introduction to Analytical and Numerical Methods / / by Wolfgang Arendt, Karsten Urban |
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Pubbl/distr/stampa |
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Cham : , : Springer International Publishing : , : Imprint : Springer, , 2023 |
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ISBN |
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Edizione |
[1st ed. 2023.] |
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Descrizione fisica |
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1 online resource (463 pages) |
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Collana |
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Graduate Texts in Mathematics, , 2197-5612 ; ; 294 |
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Disciplina |
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Soggetti |
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Differential equations |
Numerical analysis |
Functional analysis |
Differential Equations |
Numerical Analysis |
Functional Analysis |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Nota di bibliografia |
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Includes bibliographical references and index. |
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Nota di contenuto |
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1 Modeling, or where do differential equations come from -- 2 Classification and characteristics -- 3 Elementary methods -- 4 Hilbert spaces -- 5 Sobolev spaces and boundary value problems in dimension one -- 6 Hilbert space methods for elliptic equations -- 7 Neumann and Robin boundary conditions -- 8 Spectral decomposition and evolution equations -- 9 Numerical methods -- 10 Maple®, or why computers can sometimes help -- Appendix. |
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Sommario/riassunto |
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This textbook introduces the study of partial differential equations using both analytical and numerical methods. By intertwining the two complementary approaches, the authors create an ideal foundation for further study. Motivating examples from the physical sciences, engineering, and economics complete this integrated approach. A showcase of models begins the book, demonstrating how PDEs arise in practical problems that involve heat, vibration, fluid flow, and financial markets. Several important characterizing properties are used to classify mathematical similarities, then elementary methods are used to solve examples of hyperbolic, elliptic, and parabolic equations. From |
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here, an accessible introduction to Hilbert spaces and the spectral theorem lay the foundation for advanced methods. Sobolev spaces are presented first in dimension one, before being extended to arbitrary dimension for the study of elliptic equations. An extensive chapter on numerical methods focuses on finite difference and finite element methods. Computer-aided calculation with Maple™ completes the book. Throughout, three fundamental examples are studied with different tools: Poisson’s equation, the heat equation, and the wave equation on Euclidean domains. The Black–Scholes equation from mathematical finance is one of several opportunities for extension. Partial Differential Equations offers an innovative introduction for students new to the area. Analytical and numerical tools combine with modeling to form a versatile toolbox for further study in pure or applied mathematics. Illuminating illustrations and engaging exercises accompany the text throughout. Courses in real analysis and linear algebra at the upper-undergraduate level are assumed. |
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