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hep-th2013★ 117 cited
Infrared Correlations in de Sitter Space: Field Theoretic vs. Stochastic Approach
Bjorn Garbrecht, Gerasimos Rigopoulos, Yi Zhu
We consider massive λϕ^4 theory in de Sitter background. The mass of the scalar field ϕis chosen small enough, such that the amplification of superhorizon momentum modes leads to a…
astro-ph.CO2013★ 34 cited
Non-Gaussianities and Curvature Perturbations from Hybrid Inflation
Sébastien Clesse, Björn Garbrecht, Yi Zhu
For the original hybrid inflation as well as the supersymmetric F-term and D-term hybrid models, we calculate the level of non-gaussianities and the power spectrum of curvature per…