Implementation of two-field inflation for cosmic linear anisotropy solving system

Abstract

We outline the modifications in the numerical Boltzmann code Cosmic Linear Anisotropy Solving System (CLASS) in order to include extra inflationary fields. The functioning of the code is first described, how and where modifications are meant to be done are later explained. In the present study, we focus on the modifications needed for the implementation of a two-field inflationary model, with canonical kinetic terms and a polynomial potential with no cross terms, presenting preliminary results for the effect of the second field on the spectra. The adaptability of the code is exploited, making use of the classes and structures of C and the generic Runge-Kutta integration tool provided by the program.

arXiv comment5 pages, 2 figures, IWARA

References in corpus (5)

• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• Curvature and isocurvature perturbations in two-field inflation
• hi_class: Horndeski in the Cosmic Linear Anisotropy Solving System
• Multi-field inflation and cosmological perturbations
• MultiModeCode: An efficient numerical solver for multifield inflation