Abstract

We present improved estimates of critical exponents for 3D polymers near a plane adsorbing surface. The improvements were possible by simulating rather long chains (up to N=2000) by means of a new algorithm. Apart from minor but significant adjustments in the location of the tricritical point and in the various gamma -exponents, our main result is that the crossover exponent for critical adsorption is compatible with phi = 1/2 . This is much lower than previous estimates and suggests that this exponent might be superuniversal.

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