Liam - #87
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…to see nonzero plot
…e two-particle ladder contribution
… energy from T-matrix to first order
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Delta T(k, tau) matrix is not smooth
Created routines to calculate the vacuum two-particle T-matrix and many-body T-matrix in Matsubara frequency. The difference between the two in imaginary time is calculated via inverse Fourier transform using the GreensFunc package. Plotting delta T(k, tau), for fixed imaginary time tau, against incoming momentum k does not seem to yield something smooth.
Also added analytic expression for vacuum two-particle T-matrix in imaginary time.