PyTransport: A Python package for the calculation of inflationary correlation functions

Abstract

PyTransport constitutes a straightforward code written in C++ together with Python scripts which automatically edit, compile and run the C++ code as a Python module. It has been written for Unix-like systems (OS X and Linux). Primarily the module employs the transport approach to inflationary cosmology to calculate the tree-level power-spectrum and bispectrum of user specified models of multi-field inflation, accounting for all sub and super-horizon effects. The transport method we utilise means only coupled differential equations need to be solved, and the implementation presented here combines the speed of C++ with the functionality and convenience of Python. This document details the code and illustrates how to use it with a worked example. It has been updated to be a companion to the second version of the code, PyTransport 2.0, which includes functionality to deal with models of inflation with a curved field space metric.

21 pages, 5 figures. Version 2 has been updated to be a companion to the new version of PyTransport, with additional author to reflect their contribution

Cited by in corpus (8)

• Numerically evaluating the bispectrum in curved field-space - with PyTransport 2.0
• A simple, exact, model of quasi-single field inflation
• Generalized two-field $\alpha$-attractor models from geometrically finite hyperbolic surfaces
• Generalized two-field $\alpha$-attractors from the hyperbolic triply-punctured sphere
• Hidden symmetries of two-field cosmological models
• Quantum quenches during inflation
• Numerical evaluation of the tensor bispectrum in two field inflation
• Non-linear effects in early Universe cosmology