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mTransport is an automated tool that computes the 2-point-correlation function of the curvature and tensor perturbations in multifield models of inflation in the presence of a curved field space. It is an implementation of the transport method which encompasses scenarios with violations of slow-roll conditions and turns of the trajectory in field space. It can be used for an arbitrary mass spectrum, including massive modes, particle production and models with quasi-single-field dynamics.

It has been written by Mafalda Dias, Jonathan Frazer and David Seery.

How to cite mTransport

The transport method uses evolution equations for the correlation functions of primordial perturbations to compute observables. Details on this method and its current implementation for curved field-spaces are described in:

  • Computing observables in curved multifield models of inflation - A guide (with code) to the transport method, Mafalda Dias, Jonathan Frazer and David Seery, JCAP12(2015)030, arXiv:1502.03125


mTransport is released under a modifield BSD license. The full license can be found in LICENSE.txt.


Development of mTransport has been supported by:

  • The grant Precision tests of the inflationary scenario funded by the European Union’s Seventh Framework Programme (FP/2007–2013) and ERC Grant Agreement No. 308082.

  • The UK Science and Technology Facilities Council grant number ST/L000652/1, which funded the science programme at the University of Sussex Astronomy Centre from April 2014 - April 2017.

  • Fundação para a Ciência e a Tecnologia, the Portuguese national funding agency for science, research and technology.

  • IKERBASQUE, the Basque Foundation for Science.


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