科研之友
微信
新浪微博
Facebook
分享链接
摘要
Extending the analysis of J. Meyers and N. Sivanandam [Phys. Rev. D 83, 103517 (2011)] beyond the bispectrum, we explore the superhorizon generation of local non-Gaussianities and their subsequent approach to adiabaticity. Working with a class of two field models of inflation with potentials amenable to treatment with the delta N formalism, we find that, as is the case for f(NL)(local), the local trispectrum parameters tau(NL) and g(NL) are exponentially driven toward values which are slow-roll suppressed if the fluctuations are driven into an adiabatic mode by a phase of effectively single field inflation. We argue that general considerations should ensure that a similar behavior will hold for the local forms of higher point correlations as well.
- 出版日期2011-9-26
