M3pp_tau.hpp

// Copyright (c) 2017--present, The Simons Foundation
// This file is part of TRIQS/ctint and is licensed under the terms of GPLv3 or later.
// SPDX-License-Identifier: GPL-3.0-or-later
// See LICENSE in the root of this distribution for details.
 
#pragma once
#include "../qmc_config.hpp"
#include "../nfft_buf.hpp"
#include "../container_set.hpp"
 
namespace triqs_ctint::measures {

  struct M3pp_tau {
 
    M3pp_tau(params_t const &params_, qmc_config_t const &qmc_config_, container_set *results, g_tau_cv_t G0_tau_);

    void accumulate(mc_weight_t sign);

    void collect_results(mpi::communicator const &comm);
 
    private:
    // Capture the parameters
    params_t const &params;
 
    // The Monte-Carlo configuration
    qmc_config_t const &qmc_config;
 
    // Gf view for the accumulation of M3pp_tau
    block2_gf_view<prod<imtime, imtime>, tensor_valued<4>> M3pp_tau_;
 
    // Gf view for the accumulation of M3pp_delta
    block2_gf_view<imtime, tensor_valued<4>> M3pp_delta_;
 
    // The average sign
    mc_weight_t Z = 0.0;
 
    // The non-interacting Green function
    g_tau_cv_t G0_tau;
 
    // The tau-mesh for a single argument
    mesh::imtime tau_mesh;
 
    // A helper type to precompute the tau-binning
    struct idx_t {
      long tau_idx;
      int u;
      tau_t tau_pt;
    };
  };
 
} // namespace triqs_ctint::measures