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Coherent states --- Quantum theory

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For the 250th birthday of Joseph Fourier, born in 1768 in Auxerre, France, this MDPI Special Issue will explore modern topics related to Fourier Analysis and Heat Equation. Modern developments of Fourier analysis during the 20th century have explored generalizations of Fourier and Fourier–Plancherel formula for non-commutative harmonic analysis, applied to locally-compact, non-Abelian groups. In parallel, the theory of coherent states and wavelets has been generalized over Lie groups. One should add the developments, over the last 30 years, of the applications of harmonic analysis to the description of the fascinating world of aperiodic structures in condensed matter physics. The notions of model sets, introduced by Y. Meyer, and of almost periodic functions, have revealed themselves to be extremely fruitful in this domain of natural sciences. The name of Joseph Fourier is also inseparable from the study of the mathematics of heat. Modern research on heat equations explores the extension of the classical diffusion equation on Riemannian, sub-Riemannian manifolds, and Lie groups. In parallel, in geometric mechanics, Jean-Marie Souriau interpreted the temperature vector of Planck as a space-time vector, obtaining, in this way, a phenomenological model of continuous media, which presents some interesting properties. One last comment concerns the fundamental contributions of Fourier analysis to quantum physics: Quantum mechanics and quantum field theory. The content of this Special Issue will highlight papers exploring non-commutative Fourier harmonic analysis, spectral properties of aperiodic order, the hypoelliptic heat equation, and the relativistic heat equation in the context of Information Theory and Geometric Science of Information.

signal processing --- thermodynamics --- heat pulse experiments --- quantum mechanics --- variational formulation --- Wigner function --- nonholonomic constraints --- thermal expansion --- homogeneous spaces --- irreversible processes --- time-slicing --- affine group --- Fourier analysis --- non-equilibrium processes --- harmonic analysis on abstract space --- pseudo-temperature --- stochastic differential equations --- fourier transform --- Lie Groups --- higher order thermodynamics --- short-time propagators --- discrete thermodynamic systems --- metrics --- heat equation on manifolds and Lie Groups --- special functions --- poly-symplectic manifold --- non-Fourier heat conduction --- homogeneous manifold --- non-equivariant cohomology --- Souriau-Fisher metric --- Weyl quantization --- dynamical systems --- symplectization --- Weyl-Heisenberg group --- Guyer-Krumhansl equation --- rigged Hilbert spaces --- Lévy processes --- Born–Jordan quantization --- discrete multivariate sine transforms --- continuum thermodynamic systems --- interconnection --- rigid body motions --- covariant integral quantization --- cubature formulas --- Lie group machine learning --- nonequilibrium thermodynamics --- Van Vleck determinant --- Lie groups thermodynamics --- partial differential equations --- orthogonal polynomials

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For the 250th birthday of Joseph Fourier, born in 1768 in Auxerre, France, this MDPI Special Issue will explore modern topics related to Fourier Analysis and Heat Equation. Modern developments of Fourier analysis during the 20th century have explored generalizations of Fourier and Fourier–Plancherel formula for non-commutative harmonic analysis, applied to locally-compact, non-Abelian groups. In parallel, the theory of coherent states and wavelets has been generalized over Lie groups. One should add the developments, over the last 30 years, of the applications of harmonic analysis to the description of the fascinating world of aperiodic structures in condensed matter physics. The notions of model sets, introduced by Y. Meyer, and of almost periodic functions, have revealed themselves to be extremely fruitful in this domain of natural sciences. The name of Joseph Fourier is also inseparable from the study of the mathematics of heat. Modern research on heat equations explores the extension of the classical diffusion equation on Riemannian, sub-Riemannian manifolds, and Lie groups. In parallel, in geometric mechanics, Jean-Marie Souriau interpreted the temperature vector of Planck as a space-time vector, obtaining, in this way, a phenomenological model of continuous media, which presents some interesting properties. One last comment concerns the fundamental contributions of Fourier analysis to quantum physics: Quantum mechanics and quantum field theory. The content of this Special Issue will highlight papers exploring non-commutative Fourier harmonic analysis, spectral properties of aperiodic order, the hypoelliptic heat equation, and the relativistic heat equation in the context of Information Theory and Geometric Science of Information.

signal processing --- thermodynamics --- heat pulse experiments --- quantum mechanics --- variational formulation --- Wigner function --- nonholonomic constraints --- thermal expansion --- homogeneous spaces --- irreversible processes --- time-slicing --- affine group --- Fourier analysis --- non-equilibrium processes --- harmonic analysis on abstract space --- pseudo-temperature --- stochastic differential equations --- fourier transform --- Lie Groups --- higher order thermodynamics --- short-time propagators --- discrete thermodynamic systems --- metrics --- heat equation on manifolds and Lie Groups --- special functions --- poly-symplectic manifold --- non-Fourier heat conduction --- homogeneous manifold --- non-equivariant cohomology --- Souriau-Fisher metric --- Weyl quantization --- dynamical systems --- symplectization --- Weyl-Heisenberg group --- Guyer-Krumhansl equation --- rigged Hilbert spaces --- Lévy processes --- Born–Jordan quantization --- discrete multivariate sine transforms --- continuum thermodynamic systems --- interconnection --- rigid body motions --- covariant integral quantization --- cubature formulas --- Lie group machine learning --- nonequilibrium thermodynamics --- Van Vleck determinant --- Lie groups thermodynamics --- partial differential equations --- orthogonal polynomials

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Group theory --- Mathematical physics

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This second edition is fully updated, covering in particular new types of coherent states (the so-called Gazeau-Klauder coherent states, nonlinear coherent states, squeezed states, as used now routinely in quantum optics) and various generalizations of wavelets (wavelets on manifolds, curvelets, shearlets, etc.). In addition, it contains a new chapter on coherent state quantization and the related probabilistic aspects. As a survey of the theory of coherent states, wavelets, and some of their generalizations, it emphasizes mathematical principles, subsuming the theories of both wavelets and coherent states into a single analytic structure. The approach allows the user to take a classical-like view of quantum states in physics.   Starting from the standard theory of coherent states over Lie groups, the authors generalize the formalism by associating coherent states to group representations that are square integrable over a homogeneous space; a further step allows one to dispense with the group context altogether. In this context, wavelets can be generated from coherent states of the affine group of the real line, and higher-dimensional wavelets arise from coherent states of other groups. The unified background makes transparent an entire range of properties of wavelets and coherent states. Many concrete examples, such as coherent states from semisimple Lie groups, Gazeau-Klauder coherent states, coherent states for the relativity groups, and several kinds of wavelets, are discussed in detail. The book concludes with a palette of potential applications, from the quantum physically oriented, like the quantum-classical transition or the construction of adequate states in quantum information, to the most innovative techniques to be used in data processing.   Intended as an introduction to current research for graduate students and others entering the field, the mathematical discussion is self-contained. With its extensive references to the research literature, the first edition of the book is already a proven compendium for physicists and mathematicians active in the field, and with full coverage of the latest theory and results the revised second edition is even more valuable.

Coherent states. --- Wavelets (Mathematics) --- Wavelet analysis --- Coherence (Physics) --- Generalized coherent states --- States, Coherent --- Physics. --- Group theory. --- Quantum physics. --- Quantum computers. --- Spintronics. --- Quantum Physics. --- Group Theory and Generalizations. --- Quantum Information Technology, Spintronics. --- Harmonic analysis --- Stochastic processes --- Quantum theory. --- Groups, Theory of --- Substitutions (Mathematics) --- Algebra --- Quantum dynamics --- Quantum mechanics --- Quantum physics --- Physics --- Mechanics --- Thermodynamics --- Magnetoelectronics --- Spin electronics --- Microelectronics --- Nanotechnology --- Computers --- Fluxtronics --- Spinelectronics --- Coherent states