pytc.kmat.calc_K3

pytc.kmat.calc_K3(phi, jastrow_factor, jastrow_params, grid_points, weights, ranges=None, batch_size=1000)[source]

Calculate K3 matrix: K3_{pqrs} = sum_{i,j} w_i w_j phi_p(i) phi_q(i) (nabla_i u(i, j))^2 phi_r(j) phi_s(j)

Parameters:

  • phi – Orbitals on grid (Nb, N_grid)

  • jastrow_factor – JAX Jastrow factor instance

  • jastrow_params – Parameters for the Jastrow factor

  • grid_points – Array of shape (N_grid, 3)

  • weights – Array of shape (N_grid,) for integration weights

  • batch_size – Number of grid points to process at once

  • ranges – Optional tuple of (slice_p, slice_q, slice_r, slice_s). If None, computes full (Nb, Nb, Nb, Nb) matrix.