EFT implementation #9
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This PR implements the calculation of integrals in the EFT model of Large-Scale Structure, with particular emphasis on the galaxy intrinsic alignments.
The equations that are implemented are summarised in 2303.15565. The (22)-integrals are in Eq. (2.39) with the associated kernels in Eq. (A.1) and the (13)-integrals are in Eq. (2.40) with kernels in Eq. (A.3).
The FAST-PT implementation here has been benchmarked against an external code that calculates these integrals using FFTLog in mathematica. The agreement is below 1% for the (22)-integrals and below 3% for the (13)-integrals.
Happy to receive comments on the implementation and change things around if necessary.