WEBSITE CURRENTLY UNDER CONSTRUCTION
mTransport material is available from the link below, but the other codes won’t be available for a few more days.
Tools for automatic computation of inflationary perturbations
The transport method is a technique for computing correlation functions generated by fluctuations in an inflationary epoch during the early universe. This website hosts a number of software tools that implement the transport method and are freely available to the community.
This site collects a number of tools, all based on the transport method, that enable computations to be made in generic inflationary models up to the three-point function or bispectrum.
The underlying numerical method captures all relevant quantum and classical effects up to tree-level. This includes 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 the coupling to gravity.
There are currently 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.
PyTransport and CppTransport are capable of computing the three-point function of the inflationary density perturbation. The numerical method they employ can be used to obtain accurate and reliable predictions for the amplitude and shape- or scale-dependence of the bispectrum in models with fNL of order unity, even where quantum-mechanical contributions are important.