Retrieving "Relevant Perturbation" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Renormalization Group Flow

   Linked via "relevant perturbations"

   Non-Trivial Fixed Point (IR Fixed Point): These points, where $\mathbf{g}^* \neq \mathbf{0}$, correspond to genuine, interacting critical theories. Systems evolving towards such a point exhibit universal behavior characterized by critical exponents [5].
   The eigenvalues of the stability matrix $M{ij} = \partial \betai / \partial gj \vert{\mathbf{g}^*}$ near a fixed point classify the infrared stability. Positive eigenvalues indicate [relevant perturbations](/entries/relevant-perturbation…