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quantum theory of radiation

Edited by Richard Rennie and Jonathan Law.

in A Dictionary of Chemistry

January 2016; p ublished online January 2016 .

Reference Entry. Subjects: Chemistry. 141 words.

The theory that describes the emission and absorption of electromagnetic radiation. Since it is a quantum theory the processes of emission and absorption are described in terms of the...

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Quantum Gauge Theories

Xiao-Gang Wen.

in Quantum Field Theory of Many-Body Systems

September 2007; p ublished online February 2010 .

Chapter. Subjects: Mathematical and Statistical Physics. 8235 words.

The last few chapters have discussed many-boson theory and many-fermion theory because nature has many-boson systems and many-fermion systems. Do many-boson/many-fermion theories describe...

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Quantum Field Theory

Motoi Tachibana and Yoshio Yamaguchi.

in Progress of Theoretical Physics

May 2005; p ublished online May 2005 .

Journal Article. 0 words.

This is the second in a series of papers. Here we present a concrete formulation of our new quantum field theories for neutral and complex scalar fields, electromagnetic fields and Dirac...

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Quantum field theory

Joseph F. Boudreau and Eric S. Swanson.

in Applied Computational Physics

December 2017; p ublished online February 2018 .

Chapter. Subjects: Mathematical and Statistical Physics. 21627 words.

Markov chain Monte Carlo techniques are developed to compute properties of a variety of quantum field theories. The method is introduced with a simple scalar field theory and used to...

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quantum theory of radiation

Overview page. Subjects: Chemistry — Physics.

The theory that describes the emission and absorption of electromagnetic radiation. Since it is a quantum theory the processes of emission and absorption are described in terms of the...

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Euclidean quantum field theory

Franco Strocchi.

in An Introduction to Non-Perturbative Foundations of Quantum Field Theory

February 2013; p ublished online May 2013 .

Chapter. Subjects: Astronomy and Astrophysics. 7439 words.

The non-perturbative approach to quantum field theory through the functional integral formulation rests on the analytic continuation of the correlation functions to imaginary times...

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Introduction to Quantum Theory

Wai-Kee Li, Gong-Du Zhou and Thomas Chung Wai Mak.

in Advanced Structural Inorganic Chemistry

March 2008; p ublished online May 2008 .

Chapter. Subjects: Crystallography. 11355 words.

This chapter covers the rudiments of quantum theory, including the dual nature of light and matter, the Uncertainty Principle and probability concept, the electronic wavefunction, and the...

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Quantum Field Theory

Yoshio Yamaguchi.

in Progress of Theoretical Physics

May 2005; p ublished online May 2005 .

Journal Article. 0 words.

Quantum field theory free from ultraviolet divergence (UV − ∞) is developed here and subsequent papers. For this purpose we introduce a closed 3-dimensional Riemannian momentum space in the...

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Quantum Gravity and the Interpretation of Quantum Theory

Claus Kiefer.

in Quantum Gravity

February 2007; p ublished online January 2010 .

Chapter. Subjects: Mathematical and Statistical Physics. 8041 words.

This chapter focuses on an important conceptual issue — the relevance of quantum gravity for the general interpretation of quantum theory. A central part is devoted to the discussion of the...

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Quantum mechanics and elements of quantum field theory

Rodolfo Gambini and Jorge Pullin.

in A First Course in Loop Quantum Gravity

September 2011; p ublished online December 2013 .

Chapter. Subjects: Astronomy and Astrophysics. 8481 words.

This chapter reviews elementary quantum mechanics, the introduction of a Hilbert space, quantum operators, and the promotion of Poisson brackets to commutators. It discusses the Harmonic...

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Quantum Theory: A Pragmatist Approach

Richard Healey.

in The British Journal for the Philosophy of Science

December 2012; p ublished online March 2012 .

Journal Article. Subjects: Philosophy of Science; Science and Mathematics. 18350 words.

While its applications have made quantum theory arguably the most successful theory in physics, its interpretation continues to be the subject of lively debate within the community of...

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The Theory of Open Quantum Systems

Heinz-Peter Breuer and Francesco Petruccione.

January 2007; p ublished online January 2010 .

Book. Subjects: Mathematical and Statistical Physics. 656 pages.

This book treats the central physical concepts and mathematical techniques used to investigate the dynamics of open quantum systems. To provide a self-contained presentation, the text...

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Unstable Vacua In Quantum Field Theory

JEAN ZINN-JUSTIN.

in Quantum Field Theory and Critical Phenomena

June 2002; p ublished online January 2010 .

Chapter. Subjects: Mathematical and Statistical Physics. 7516 words.

This chapter begins with a semi-classical study of barrier penetration in quantum field theory, generalizing the methods explained in quantum mechanics. It has been shown that in quantum...

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Custodian of quantum field theory

JAGDISH MEHRA and KIMBALL A. MILTON.

in Climbing the Mountain

August 2003; p ublished online January 2010 .

Chapter. Subjects: History of Science and Technology. 17929 words.

Julian Schwinger had now scaled the peak of quantum electrodynamics (QED), not once, but three times, the last time by inventing a new approach to any quantum-mechanical system, the quantum...

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Conspiracy Theories of Quantum Mechanics

Peter J. Lewis.

in The British Journal for the Philosophy of Science

June 2006; p ublished online April 2006 .

Journal Article. Subjects: Philosophy of Science; Science and Mathematics. 10064 words.

It has long been recognized that a local hidden variable theory of quantum mechanics can in principle be constructed, provided one is willing to countenance pre-measurement correlations...

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Philosophical foundations of quantum field theory

N Huggett.

in The British Journal for the Philosophy of Science

December 2000; p ublished online December 2000 .

Journal Article. Subjects: Philosophy of Science; Science and Mathematics. 0 words.

Much attention has been directed to the philosophical implications of quantum field theory (QFT) in recent years; this paper attempts a survey in low-technical terms. First the relations of...

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Quantum Field Theory: Divergences and Regularization

JEAN ZINN-JUSTIN.

in Quantum Field Theory and Critical Phenomena

June 2002; p ublished online January 2010 .

Chapter. Subjects: Mathematical and Statistical Physics. 9172 words.

This chapter considers specifically local relativistic field theories: the action is the integral of the lagrangian density that is a function of fields and their derivatives. It shows that...

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Quantum Field Theory: Functional Methods and Perturbation Theory

JEAN ZINN-JUSTIN.

in Quantum Field Theory and Critical Phenomena

June 2002; p ublished online January 2010 .

Chapter. Subjects: Mathematical and Statistical Physics. 10539 words.

This chapter proceeds with the study of local, relativistic quantum field theory. It first discusses the neutral self-coupled scalar field φ(x) introduced in Section 6.6.1. An important...

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Quantum Field Theory and Critical Phenomena

Jean Zinn-Justin.

June 2002; p ublished online January 2010 .

Book. Subjects: Mathematical and Statistical Physics. 1074 pages.

The book is an introduction to quantum field theory and renormalization group. It shows that these frameworks are essential for the understanding of phenomena belonging to many different...

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How Quantum Theory Helps Us Explain

Richard A. Healey.

in The British Journal for the Philosophy of Science

March 2015; p ublished online September 2013 .

Journal Article. Subjects: Philosophy of Science; Science and Mathematics. 17738 words.

I offer an account of how the quantum theory we have helps us explain so much. The account depends on a pragmatist interpretation of the theory: this takes a quantum state to serve as a...

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