All Title Author
Keywords Abstract

Physics  2013 

Effects of the imaginary inflaton component in supergravity new inflation

DOI: 10.1088/1475-7516/2013/11/028

Full-Text   Cite this paper   Add to My Lib


When models of new inflation are implemented in supergravity, the inflaton is a complex and not a real scalar field. As a complex scalar field has two independent components, supergravity models of new inflation are naturally two-field models. In this paper, we use the delta N formalism to analyse how the two-field behaviour modifies the usual single-field predictions. We find that the model reduces to the single-field limit if the inflaton mass term is sufficiently small. Otherwise, the imaginary inflaton component reduces the amplitude A_s and the spectral index n_s of the scalar curvature perturbations. However, the perturbations remain nearly Gaussian, and the reduced bispectrum f_NL is too small to be observed.


comments powered by Disqus

Contact Us


微信:OALib Journal