Implementation of two‐field inflation for cosmic linear anisotropy solving system. Issue 1 (7th February 2021)

• Record Type: Journal Article
• Authors: Morales‐Martínez, Braulio; Arciniega, Gustavo; Jaime, Luisa G.; Piccinelli, Gabriella
• Other Names: Zen Vasconcellos C.A. guestEditor.; Hess P.O. guestEditor.; Piccinelli G. guestEditor.; Vargas Magaña M. guestEditor.; Ureña-Lopez L. guestEditor.; González Felipe R. guestEditor.; Boller Th. guestEditor.; Gullberg S. guestEditor.
• Is Part Of: Astronomische Nachrichten. Volume 342:Issue 1/2(2021)
• Page Start: 58
• Page End: 62
• Publication Date: 2021-02-07
• Subjects: CLASS -- linear perturbations -- numerical methods -- primordial spectra -- two‐field inflation; Astronomy -- Periodicals; 520.5
• DOI: 10.1002/asna.202113881
• Languages: English
• ISSNs: 0004-6337

Abstract

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.