TY - JOUR AU - Agullo, I. AU - Navarro-Salas, J. AU - Parker, L. PY - 2012 DA - 2012// TI - Enhanced local-type inflationary trispectrum from a non-vacuum initial state T2 - J. Cosmol. Astropart. Phys. JO - Journal of Cosmology and Astroparticle Physics SP - 019 EP - 13pp VL - 05 IS - 5 PB - Iop Publishing Ltd KW - inflation KW - non-gaussianity KW - quantum field theory on curved space KW - cosmological perturbation theory AB - We compute the primordial trispectrum for curvature perturbations produced during cosmic inflation in models with standard kinetic terms, when the initial quantum state is not necessarily the vacuum state. The presence of initial perturbations enhances the trispectrum amplitude for configuration in which one of the momenta, say k(3), is much smaller than the others, k(3) << k(1,2,4). For those squeezed con figurations the trispectrum acquires the so-called local form, with a scale dependent amplitude that can get values of order epsilon(k(1)/k(3))(2). This amplitude could be larger than the prediction of the so-called Maldacena consistency relation by a factor as large as 10(6), and could reach the sensitivity of forthcoming observations, even for single-field inflationary models. SN - 1475-7516 UR - http://arxiv.org/abs/1112.1581 UR - https://doi.org/10.1088/1475-7516/2012/05/019 DO - 10.1088/1475-7516/2012/05/019 LA - English N1 - WOS:000305415200020 ID - Agullo_etal2012 ER -