Recursive Stochastic Effects in Valley Hybrid Inflation

Understand

Hybrid Inflation is a two-field model where inflation ends by a tachyonic instability, the duration of which is determined by stochastic effects and has important observational implications.

• Making use of the recursive approach to the stochastic formalism presented in Ref.
• [1], these effects are consistently computed.
• Through an analysis of back-reaction, this method is shown to converge in the valley but points toward an (expected) instability in the waterfall.