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  2. Correlation function (quantum field theory) - Wikipedia

    en.wikipedia.org/wiki/Correlation_function...

    It is often preferable to work directly with these as they contain all the information that the full correlation functions contain since any disconnected diagram is merely a product of connected diagrams. By excluding other sets of diagrams one can define other correlation functions such as one-particle irreducible correlation functions.

  3. Weaire–Phelan structure - Wikipedia

    en.wikipedia.org/wiki/Weaire–Phelan_structure

    In geometry, the Weaire–Phelan structure is a three-dimensional structure representing an idealised foam of equal-sized bubbles, with two different shapes. In 1993, Denis Weaire and Robert Phelan found that this structure was a better solution of the Kelvin problem of tiling space by equal volume cells of minimum surface area than the previous best-known solution, the Kelvin structure.

  4. Bubble chart - Wikipedia

    en.wikipedia.org/wiki/Bubble_chart

    A bubble chart is a type of chart that displays three dimensions of data. Each entity with its triplet ( v 1 , v 2 , v 3 ) of associated data is plotted as a disk that expresses two of the v i values through the disk's xy location and the third through its size.

  5. Quantum vacuum state - Wikipedia

    en.wikipedia.org/wiki/Quantum_vacuum_state

    The video of an experiment showing vacuum fluctuations (in the red ring) amplified by spontaneous parametric down-conversion.. If the quantum field theory can be accurately described through perturbation theory, then the properties of the vacuum are analogous to the properties of the ground state of a quantum mechanical harmonic oscillator, or more accurately, the ground state of a measurement ...

  6. Random phase approximation - Wikipedia

    en.wikipedia.org/wiki/Random_phase_approximation

    Bubble diagrams, which result in the RPA when summed up. Solid lines stand for interacting or non-interacting Green's functions , dashed lines for two-particle interactions. The random phase approximation ( RPA ) is an approximation method in condensed matter physics and nuclear physics .

  7. Quartic interaction - Wikipedia

    en.wikipedia.org/wiki/Quartic_interaction

    The Feynman diagram expansion may be obtained also from the Feynman path integral formulation. [3] The time-ordered vacuum expectation values of polynomials in φ, known as the n-particle Green's functions, are constructed by integrating over all possible fields, normalized by the vacuum expectation value with no external fields,

  8. Matsubara frequency - Wikipedia

    en.wikipedia.org/wiki/Matsubara_frequency

    To produce simple poles on boson frequencies =, either of the following two types of Matsubara weighting functions can be chosen () = = = (+ ()),() = = (),depending on which half plane the convergence is to be controlled in. () controls the convergence in the left half plane (Re z < 0), while () controls the convergence in the right half plane (Re z > 0).

  9. File:BubbleDiagram.svg - Wikipedia

    en.wikipedia.org/wiki/File:BubbleDiagram.svg

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