Two-loop renormalization-group analysis of critical behavior at m-axial Lifshitz points

Abstract

We investigate the critical behavior that d-dimensional systems with short-range forces and a n-component order parameter exhibit at Lifshitz points whose wave-vector instability occurs in a m-dimensional isotropic subspace of ${\mathbb{R}}^d$. Utilizing dimensional regularization and minimal subtraction of poles in $d=4+\frac{m}{2}-\epsilon$ dimensions, we carry out a two-loop renormalization-group (RG) analysis of the field-theory models representing the corresponding universality classes. This gives the beta function ${\beta }_u(u)$ to third order, and the required renormalization factors as well as the associated RG exponent functions to second order, in u. The coefficients of these series are reduced to m-dependent expressions involving single integrals, which for general (not necessarily integer) values of $m\in (0,8)$ can be computed numerically, and for special values of m analytically. The $\epsilon$ expansions of the critical exponents ${\eta }_{l2}$, ${\eta }_{l4}$, ${\nu }_{l2}$, ${\nu }_{l4}$, the wave-vector exponent ${\beta }_q$, and the correction-to-scaling exponent are obtained to order ${\epsilon }^2$. These are used to estimate their values for d=3. The obtained series expansions are shown to encompass both isotropic limits m=0 and m=d.

42 pages, 1 figure; to appear in Nuclear Physics B; footnote added, minor changes in v2

References in corpus (1)

• Anisotropic Lifshitz Point at $O({\epsilon }_L^2)$

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