The transport method is a technique for computing the correlation functions of fluctuations generated in an inflationary epoch during the early universe.
This site collects a number of tools that enable computations to be made in generic inflationary models up to the three-point function. Our numerical methods capture all relevant quantum and classical effects at tree-level, including quantum interference between growing and decaying modes near horizon exit, classical correlation between species near horizon exit and on superhorizon scales, effects from mass hierarchies, and coupling to gravity.
We currently provide three tools with differing capabilities and use cases. PyTransport and CppTransport are two- and three-point function solvers for multiple-field models with an arbitrary potential but canonical kinetic terms. mTransport is a two-point function solver for multiple-field models with arbitrary potential and a non-Euclidean field-space metric.