Non-Gaussianity beyond slow roll in multi-field inflation

作者：Byrnes Christian T^*; Tasinato Gianmassimo

来源：Journal of Cosmology and Astroparticle Physics, 2009, 2009(8): 016.

DOI：10.1088/1475-7516/2009/08/016

• inflation
• non-gaussianity
• cosmological perturbation theory

We study the non-Gaussianity generated during multiple-field inflation. We provide an exact expression for the bispectrum parameter f(NL) which is valid beyond the slow-roll regime, valid for certain classes of inflationary models. We then study a new, exact multi-field inflationary model considering a case where the bispectrum grows to observable values at the end of inflation. We show that in this case the trispectrum is also large and may even provide the dominant signal of non-Gaussianity.

• 出版日期2009-8