class DensityFluctuations : public MeasuringDevice class DensityFluctuations : public MeasuringDevice Purpose: Finds the linear and non linear susceptibility associated with p=\sum_i cos(2*pi*n*x_i)
virtual void Start()
virtual void TakeData()
virtual void SumData()
virtual void Average()
virtual void Initialize()
Purpose: Finds the linear and non linear susceptibility associated with p=\sum_i cos(2*pi*n*x_i). These are the even terms in a Fourrier serie expansion of the density \rho(x)=\sum_i\delta(x-x_i). Note: This class takes an additional parameter compared to Compressibility which is the int n_k that specifies the wavevector. !!! The normalization might have to be changed to include a factor 1/k (not implemented yet.)
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