Abstract
We show that the recent renormalization-group analysis of Lifshitz critical behavior presented by Leite [Phys. Rev. B 67, 104415 (2003)] suffers from a number of severe deficiencies. In particular, we show that his approach does not give an ultraviolet finite renormalized theory, is plagued by inconsistencies, misses the existence of a nontrivial anisotropy exponent and therefore yields incorrect hyperscaling relations. His -expansion results to order for the critical exponents of m-axial Lifshitz points are incorrect in both the anisotropic and isotropic cases. The inherent inconsistencies and the lack of a sound basis of the approach makes its results unacceptable even if they are interpreted in the sense of approximations.
- Received 14 April 2003
DOI:https://doi.org/10.1103/PhysRevB.68.066401
©2003 American Physical Society