Computing observables in curved multifield models of inflation—A guide (with code) to the transport method - INSPIRE

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Computing observables in curved multifield models of inflation—A guide (with code) to the transport method

Mafalda Dias
(
- Sussex U., Astron. Ctr.
)
,
Jonathan Frazer
(
- Basque U., Bilbao and
- IKERBASQUE, Bilbao
)
,
David Seery
(
- Sussex U., Astron. Ctr.
)

Feb 10, 2015

22 pages

Published in:

JCAP 12 (2015) 030

Published: Dec 14, 2015

e-Print:

1502.03125 [astro-ph.CO]

DOI:

10.1088/1475-7516/2015/12/030

View in:

reference search93 citations

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Abstract: (arXiv)

We describe how to apply the transport method to compute inflationary observables in a broad range of multiple-field models. The method is efficient and encompasses scenarios with curved field-space metrics, 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 and models with quasi-single-field dynamics. In this note we focus on practical issues. It is accompanied by a Mathematica code which can be used to explore suitable models, or as a basis for further development.

Note:

22 pages; accompanying code available from transportmethod.com. v3: improved treatment of tensor power spectrum and tensor spectral index

inflation
cosmological perturbation theory
inflation: model
slow-roll approximation
multiple field
mass spectrum
trajectory
cosmological model
perturbation theory

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Figures(4)

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