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 and an optional non-Euclidean field-space metric. They use Python and C++, respectively. mTransport is a Mathematica code that solves only for the two-point function, also in multiple-field models with arbitrary potential and a non-Euclidean field-space metric. It is easier to get started with mTransport than PyTransport or CppTransport, but PyTransport and CppTransport have more features.
