The distinctive features of single field inflationary models with non-minimal
kinetic terms, like Dirac-Born-Infeld and k-inflation, can be captured by more
familiar multiple field inflationary systems of the type that typically arise
in low energy supergravity models. At least one heavy field, which we call the
gelaton, has an effective potential which depends on the kinetic energy of the
inflaton. Integrating out the gelaton gives rise to an effectively single field
system for which the speed of sound for the adiabatic fluctuations is reduced,
generating potentially observable equilateral non-Gaussianity, while causing
negligible isocurvature fluctuations. This mechanism is only active if there is
a relatively tight coupling between the gelaton and the inflaton, and this puts
an upper limit on the mass of the gelaton for which the inflaton-gelaton system
remains weakly coupled. This approach gives a UV-completable framework for
describing large classes of k-inflationary behavior.

本文介绍了一种通过重积分解耦的方法，将带非最小动能项的单场较弱耦合的膨胀模型描述为多场超引力模型，并提出引导非正态性的机制，从而生成潜在的可观测的等边非高斯性。