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Anomalous High Energy Dependence in Inflationary Density Perturbations
Xingang Chen, Yi Wang
We study the contribution of spectator massive scalar fields to the inflationary density perturbations through the universal gravitational coupling. We find that such contribution…
Scale-Invariant Fluctuations from Galilean Genesis
Yi Wang, Robert Brandenberger
We study the spectrum of cosmological fluctuations in scenarios such as Galilean Genesis in which a spectator scalar field acquires a scale-invariant spectrum of perturbations duri…
Quasi-Single Field Inflation with Large Mass
Xingang Chen, Yi Wang
We study the effect of massive isocurvaton on density perturbations in quasi-single field inflation models, when the mass of the isocurvaton M becomes larger than the order of the…
Multi-Stream Inflation in a Landscape
Francis Duplessis, Yi Wang, Robert Brandenberger
There are hidden observables for inflation, such as features localized in position space, which do not manifest themselves when only one inflation trajectory is considered. To addr…