Lifshitz-point critical behaviour to ${\boldsymbol{O(ε^2)}}$

Details Lifshitz-point critical behaviour to ${\boldsymbol{O(ε^2)}}$ Lifshitz-point critical behaviour to ${\boldsymbol{O(ε^2)}}$

2001-06-25

arxiv.org/abs/cond-mat/0106502v1

J. Phys. A 34 (2001) 9101-9105

Physics

Condensed Matter

Statistical Mechanics

Latex file, uses the included iop stylefiles; Uses the texdraw package to generate included figures

Scientific paper

10.1088/0305-4470/34/42/401

We comment on a recent letter by L. C. de Albuquerque and M. M. Leite (J. Phys. A: Math. Gen. 34 (2001) L327-L332), in which results to second order in $\epsilon=4-d+\frac{m}{2}$ were presented for the critical exponents $\nu_{{\mathrm{L}}2}$, $\eta_{{\mathrm{L}}2}$ and $\gamma_{{\mathrm{L}}2}$ of d-dimensional systems at m-axial Lifshitz points. We point out that their results are at variance with ours. The discrepancy is due to their incorrect computation of momentum-space integrals. Their speculation that the field-theoretic renormalization group approach, if performed in position space, might give results different from when it is performed in momentum space is refuted.

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