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

TL;DR

This paper details the modifications made to the CLASS code to incorporate two-field inflation models, enabling analysis of their effects on cosmic anisotropy spectra with preliminary results.

Contribution

It introduces a method to implement two-field inflationary models into the CLASS code, expanding its capability for cosmological simulations.

Findings

Modified CLASS to include two-field inflation

Preliminary results on second field's impact on spectra

Demonstrated code adaptability for inflationary models

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.