Calculating the Conformal Charge from the Second Moment of the SpinSpin Correlation Function
Abstract
We develop high field expansions for the second moment of the spinspin correlation function of the twodimensional Ising model at arbitrary temperature T. Setting T = T_{c} and approaching the critical point along the field direction, this quantity has a 1/h^{2} divergence as the external field h goes to zero. The amplitude for this divergence is estimated by series extrapolation methods, and is shown to lead to an estimate for the central charge of 0.50 by using Cardy's formula for the central charge in terms of hyperuniversal amplitude ratios.
 Publication:

Proceedings of the Royal Society of London Series A
 Pub Date:
 August 1993
 DOI:
 10.1098/rspa.1993.0116
 Bibcode:
 1993RSPSA.442..485S