Non-gaussianity from the trispectrum and vector field perturbations

作者：Valenzuela Toledo Cesar A; Rodriguez Yeinzon^*

来源：Physics Letters B, 2010, 685(2-3): 120-127.

DOI：10.1016/j.physletb.2010.01.060

We use the delta N formalism to study the trispectrum T-zeta of the primordial curvature perturbation zeta when the latter is generated by vector field perturbations, considering the tree-level and one-loop contributions. The order of magnitude of the level of non-gaussianity in the trispectrum, tau(NL), is calculated in this scenario and related to the order of magnitude of the level of non-gaussianity in the bispectrum, f(NL), and the level of statistical anisotropy in the power spectrum, g(zeta). Such consistency relations will put under test this scenario against future observations. Comparison with the expected observational bound on tau(NL) from WMAP, for generic inflationary models, is done.

• 出版日期2010-3-1