Inflationary Butterfly Effect: Nonperturbative Dynamics from Small-Scale Features

Area of Science:

• Cosmology
• Theoretical Physics
• Astrophysics

Background:

• Cosmic inflation is a theoretical framework explaining the early Universe's rapid expansion.
• The standard inflationary model assumes a slow-roll approximation, which may not always hold.
• Understanding nonperturbative dynamics is crucial for a complete picture of inflation.

Purpose of the Study:

• To investigate the nonperturbative dynamics of single-field inflation beyond the slow-roll approximation.
• To explore the phenomenological implications of oscillatory features in the inflationary potential.
• To assess the role of small-scale physics in the evolution of the Universe.

Main Methods:

• Utilized numerical simulations to model inflationary dynamics.
• Introduced departures from the slow-roll condition.
• Analyzed the impact of oscillatory potential features on the inflationary trajectory.

Main Results:

• Oscillatory features in the potential can significantly alter inflation's course.
• Identified scenarios where the Universe becomes trapped in a perpetual de Sitter state.
• Discovered a new channel for primordial black hole formation through false vacuum trapping.

Conclusions:

• Small-scale features in the inflationary potential can have large-scale cosmological consequences.
• Numerical simulations are powerful tools for exploring small-scale physics in inflation.
• The findings have implications for gravitational-wave astronomy and understanding the early Universe.