UNIVERSAL AMPLITUDE RATIOS IN THE 3D ISING-MODEL

We present a high precision Monte Carlo study of various universal amp litude ratios of the three dimensional Ising spin model. Using state o f the art simulation techniques we studied the model close to critical ity in both phases. Great care was taken to control systematic errors due to finite size effects and correction to scaling terms. We obtain C+/C- = 4.75(3), f(+,2nd)/f(-,2nd) = 1.95(2) and u = 14.3(1). Our res ults are compatible with those obtained by field theoretic methods app lied to the phi(4) theory and high and low temperature series expansio ns of the Ising model.