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  2. Self-phase modulation - Wikipedia

    en.wikipedia.org/wiki/Self-phase_modulation

    Self-phase modulation (SPM) is a nonlinear optical effect of light–matter interaction. An ultrashort pulse of light, when travelling in a medium, will induce a varying refractive index of the medium due to the optical Kerr effect. [1]

  3. Position and momentum spaces - Wikipedia

    en.wikipedia.org/wiki/Position_and_momentum_spaces

    Conversely, the inverse Fourier transform of a momentum space function is a position space function. These quantities and ideas transcend all of classical and quantum physics, and a physical system can be described using either the positions of the constituent particles, or their momenta, both formulations equivalently provide the same ...

  4. Propagator - Wikipedia

    en.wikipedia.org/wiki/Propagator

    The Fourier transform of the position space propagators can be thought of as propagators in momentum space. These take a much simpler form than the position space propagators. They are often written with an explicit ε term although this is understood to be a reminder about which integration contour is appropriate (see above).

  5. Fourier analysis - Wikipedia

    en.wikipedia.org/wiki/Fourier_analysis

    Lectures on Image Processing: A collection of 18 lectures in pdf format from Vanderbilt University. Lecture 6 is on the 1- and 2-D Fourier Transform. Lectures 7–15 make use of it., by Alan Peters; Moriarty, Philip; Bowley, Roger (2009). "Σ Summation (and Fourier Analysis)". Sixty Symbols. Brady Haran for the University of Nottingham.

  6. Feynman diagram - Wikipedia

    en.wikipedia.org/wiki/Feynman_diagram

    The matrix that changes coordinates from φ(x) to φ(k) can be read off from the definition of a Fourier transform. = and the Fourier inversion theorem tells you the inverse: = which is the complex conjugate-transpose, up to factors of 2 π. On a finite volume lattice, the determinant is nonzero and independent of the field values.

  7. Quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/Quantum_mechanics

    Quantum mechanics is a fundamental theory that describes the behavior of nature at and below the scale of atoms. [2]: 1.1 It is the foundation of all quantum physics, which includes quantum chemistry, quantum field theory, quantum technology, and quantum information science.

  8. Glossary of physics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_physics

    A branch of physics that studies atoms as isolated systems of electrons and an atomic nucleus. Compare nuclear physics. atomic structure atomic weight (A) The sum total of protons (or electrons) and neutrons within an atom. audio frequency A periodic vibration whose frequency is in the band audible to the average human, the human hearing range.

  9. Physical chemistry - Wikipedia

    en.wikipedia.org/wiki/Physical_chemistry

    Physical chemistry is the study of macroscopic and microscopic phenomena in chemical systems in terms of the principles, practices, and concepts of physics such as motion, energy, force, time, thermodynamics, quantum chemistry, statistical mechanics, analytical dynamics and chemical equilibria.