Numerically evaluating the bispectrum in curved field-space - with PyTransport 2.0

Abstract

We extend the transport framework for numerically evaluating the power spectrum and bispectrum in multi-field inflation to the case of a curved field-space metric. This method naturally accounts for all sub- and super-horizon tree level effects, including those induced by the curvature of the field-space. We present an open source implementation of our equations in an extension of the publicly available PyTransport code. Finally we illustrate how our technique is applied to examples of inflationary models with a non-trivial field-space metric.

31 pages and 23 figures v2: Typos corrected and references added. This is an author-created, un-copyedited version of an article published in JCAP. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://iopscience.iop.org/article/10.1088/1475-7516/2018/01/023

References in corpus (7)

• Conformal Transformations with Multiple Scalar Fields
• Primordial Bispectrum from Multifield Inflation with Nonminimal Couplings
• Multifield Dynamics of Higgs Inflation
• MultiModeCode: An efficient numerical solver for multifield inflation
• Transport equations for the inflationary trispectrum
• A short note on the curvature perturbation at second order
• The bispectrum of single-field inflationary trajectories with $c_s\ne 1$