Non-Gaussianity from Step Features in the Inflationary Potential
نویسندگان
چکیده
Peter Adshead, Cora Dvorkin, 2, 3 Wayne Hu, 4 and Eugene A. Lim Kavli Institute for Cosmological Physics, Enrico Fermi Institute, University of Chicago, Illinois 60637, USA Department of Physics, University of Chicago, Illinois 60637, USA School of Natural Sciences, Institute for Advanced Study, Princeton, New Jersey 08540, USA Department of Astronomy & Astrophysics, University of Chicago, Illinois 60637, USA Department of Applied Maths and Theoretical Physics, University of Cambridge, Cambridge CB3 0HA, U.K.
منابع مشابه
Non-Gaussianity and large-scale structure in a two-field inflationary model
Single-field inflationary models predict nearly Gaussian initial conditions, and hence a detection of non-Gaussianity would be a signature of the more complex inflationary scenarios. In this paper we study the effect on the cosmic microwave background and on large-scale structure from primordial nonGaussianity in a two-field inflationary model in which both the inflaton and curvaton contribute ...
متن کاملNon-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models
We study non-Gaussianity, the spectral index of primordial scalar fluctuations and tensor modes in models where fluctuations from the inflaton and the curvaton can both contribute to the present cosmic density fluctuations. Even though simple single-field inflation models generate only tiny non-Gaussianity, if we consider such a mixed scenario, large non-Gaussianity can be produced. Furthermore...
متن کاملOscillating bispectra and galaxy clustering: A novel probe of inflationary physics with large-scale structure
Many models of inflation predict oscillatory features in the bispectrum of primordial fluctuations. Since it has been shown that primordial non-Gaussianity can lead to a scale-dependent halo bias, we investigate the effect of oscillations in the three-point function on the clustering of dark-matter halos. Interestingly, we find that features in the inflaton potential such as oscillations or sha...
متن کاملNon Gaussianity of General Multiple-Field Inflationary Models
Using the “δN -formalism”, We obtain the expression of the non Gaussianity of multiple-field inflationary models with the nontrivial field-space metric. Further, we rewritten the result by using the slowrolling approximation. Finally, using our result, we calculate the nonlinear parameter of the racetrack inflationary model. PACS: 98.80.Cq, 98.80.Jk, 04.20.Gz
متن کاملNon-Gaussianity from Instant and Tachyonic Preheating
We study non-Gaussianity in two distinct models of preheating: instant and tachyonic. In instant preheating non-Gaussianity is sourced by the local terms generated through the coupled perturbations of the two scalar fields. We find that the non-Gaussianity parameter is given by f NL ∼ 2g < O(1), where g is a coupling constant, so that instant preheating is unlikely to be constrained by WMAP or ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2011