86 citations · 292 across the 9 of their papers we have counts for
9 papers
Covariant second-order perturbations in generalized two-field inflation
Eleftheria Tzavara, Shuntaro Mizuno, Bartjan van Tent
We examine the covariant properties of generalized models of two-field inflation, with non-canonical kinetic terms and a possibly non-trivial field metric. We demonstrate that kine…
Second-order cosmological perturbations in two-field inflation and predictions for non-Gaussianity
Eleftheria Tzavara
Inflationary predictions for the power spectrum of the curvature perturbation have been verified to an excellent degree, leaving many models compatible with observations. In this t…
Momentum dependence of the bispectrum in two-field inflation
Eleftheria Tzavara, Bartjan van Tent
We examine the momentum dependence of the bispectrum of two-field inflationary models within the long-wavelength formalism. We determine the sources of scale dependence in the expr…
Gauge-invariant perturbations at second order in two-field inflation
Eleftheria Tzavara, Bartjan van Tent
We study the second-order gauge-invariant adiabatic and isocurvature perturbations in terms of the scalar fields present during inflation, along with the related fully non-linear s…
Bispectra from two-field inflation using the long-wavelength formalism
Eleftheria Tzavara, Bartjan van Tent
We use the long-wavelength formalism to compute the bispectral non-Gaussianity produced in two-field inflation. We find an exact result that is used as the basis of numerical studi…
Modified brane cosmologies with induced gravity, arbitrary matter content and a Gauss-Bonnet term in the bulk
Pantelis S. Apostolopoulos, Nikolaos Brouzakis, Nikolaos Tetradis +1
We extend the covariant analysis of the brane cosmological evolution in order to take into account, apart from a general matter content and an induced-gravity term on the brane, a…