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We describe further details of the Stochastic Coupled Cluster method and adiagnostic of such calculations, the shoulder height, akin to the plateau foundin Full Configuration Interaction Quantum Monte Carlo. We describe an initiatormodification to Stochastic Coupled Cluster Theory and show that initiatorcalculations can be extrapolated to the unbiased limit. We apply this method tothe 3D 14-electron uniform electron gas and present complete basis set limitvalues of the CCSD and previously unattainable CCSDT correlation energies forup to rs = 2, showing a requirement to include triple excitations to accuratelycalculate energies at high densities.

Developments in Stochastic Coupled Cluster Theory: The initiator approximation and application to the Uniform Electron Gas