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MULTIMODECODE : an efficient numerical solver for multifield inflation

Price, LC; Frazer, J; Xu, J; Peiris, HV; Easther, R; (2015) MULTIMODECODE : an efficient numerical solver for multifield inflation. Journal of Cosmology and Astroparticle Physics , 2015 (3) 10.1088/1475-7516/2015/03/005. Green open access

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Abstract

We present MULTIMODECODE, a Fortran 95/2000 package for the numerical exploration of multifield inflation models. This program facilitates efficient Monte Carlo sampling of prior probabilities for inflationary model parameters and initial conditions and is the first publicly available code that can efficiently generate large sample-sets for inflation models with Script O fields. The code numerically solves the equations of motion for the background and first-order perturbations of multi-field inflation models with canonical kinetic terms and arbitrary potentials, providing the adiabatic, isocurvature, and tensor power spectra at the end of inflation. For models with sum-separable potentials MULTIMODECODE also computes the slow-roll prediction via the δ N formalism for easy model exploration and validation. We pay particular attention to the isocurvature perturbations as the system approaches the adiabatic limit, showing how to avoid numerical instabilities that affect some other approaches to this problem. We demonstrate the use of MULTIMODECODE by exploring a few toy models. Finally, we give a concise review of multifield perturbation theory and a user's manual for the program.

Type: Article
Title: MULTIMODECODE : an efficient numerical solver for multifield inflation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1475-7516/2015/03/005
Publisher version: http://dx.doi.org/10.1088/1475-7516/2015/03/005
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Particles & Fields, Physics, inflation, cosmological perturbation theory, initial conditions and eternal universe, physics of the early universe, DENSITY PERTURBATIONS, 2-FIELD INFLATION, CHAOTIC INFLATION, PARTICLE PHYSICS, DYNAMICS, MODELS
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1480130
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