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  1. Renormalization Group Flow

    Linked via "fixed points"

    The $\beta$-Function and Fixed Points
    The central object characterizing the RG flow is the $\beta$-function, $\betai = d gi / d (\ln \Lambda)$, where $g_i$ are the coupling constants. The nature of the fixed points of the flow—values $\mathbf{g}^$ where $\beta(\mathbf{g}^) = \mathbf{0}$—dictates the long-distance behavior of the theory.
    Types of Fixed Points