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The multicritical point at which both a 3-component and a 2-component orderparameters order simultaneously in 3 dimensions is shown to have the criticalbehavior of the decoupled fixed point, with separate n=3 and n=2 behavior. Thiscontradicts both the extrapolation of the epsilon-expansion at leading order,which yields the biconical point, and recent Monte Carlo simulations, whichgave isotropic SO(5) behavior. Thus, this tetracritical point carries noinformation on the relevance of the so-called SO(5) theory of high-Tsuperconductivity.Comment: 1 pag

Comment on “Bicritical and Tetracritical Phenomena and Scaling Properties of the SO(5) Theory”