Numerical evaluation of the tensor bispectrum in two field inflation. Issue 7 (19th July 2017)

• Record Type: Journal Article
• Authors: Raveendran, Rathul Nath; Sriramkumar, L.
• Is Part Of: Journal of cosmology and astroparticle physics. Volume 2017:Issue 7(2017)
• Page Start: 035
• Page End: 035
• Publication Date: 2017-07-19
• Subjects: inflation -- non-gaussianity -- cosmological perturbation theory -- physics of the early universe; Cosmology -- Periodicals; Astrophysics -- Periodicals; 523.0105
• DOI: 10.1088/1475-7516/2017/07/035
• Languages: English
• ISSNs: 1475-7516

Abstract

Abstract: We evaluate the dimensionless non-Gaussianity parameter h NL, that characterizes the amplitude of the tensor bispectrum, numerically for a class of two field inflationary models such as double inflation, hybrid inflation and aligned natural inflation. We compare the numerical results with the slow roll results which can be obtained analytically. In the context of double inflation, we also investigate the effects on h NL due to curved trajectories in the field space. We explicitly examine the validity of the consistency relation governing the tensor bispectrum in the squeezed limit. Lastly, we discuss the contribution to h NL due to the epoch of preheating in two field models.