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Nonlinear Dynamics of Preheating after Multifield Inflation with Nonminimal Couplings.

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We studied multifield models with nonminimal couplings using lattice simulations. Large couplings cause rapid preheating, suppressing multifield signatures and aligning predictions with cosmic microwave background observations.

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Area of Science:

  • Cosmology
  • Theoretical Physics
  • Particle Physics

Background:

  • Postinflationary dynamics in multifield models are crucial for understanding the early universe.
  • Nonminimal couplings introduce nonlinear effects that require advanced simulation techniques.
  • Understanding thermalization and preheating is key to connecting theory with observational data.

Purpose of the Study:

  • To investigate the postinflationary dynamics of multifield models with nonminimal couplings.
  • To capture nonlinear effects such as backreaction and rescattering using lattice simulations.
  • To determine the impact of nonminimal couplings on preheating, thermalization timescales, and primordial observables.

Main Methods:

  • Utilized lattice simulations to model multifield dynamics with nonminimal couplings.
  • Measured the effective equation of state and timescales for thermalization.
  • Analyzed the influence of varying nonminimal coupling constants on particle production and attractor behavior.

Main Results:

  • Identified efficient particle production and nearly instantaneous preheating for large nonminimal coupling constants.
  • Observed the persistence of strong single-field attractor behavior throughout preheating.
  • Found that multifield signatures are suppressed, leading to predictions consistent with observations.

Conclusions:

  • Nonminimal couplings significantly impact early universe dynamics, leading to rapid preheating.
  • The observed suppression of multifield signatures ensures that model predictions align with cosmic microwave background anisotropy data.
  • These findings refine our understanding of primordial perturbation spectra in multifield cosmological models.