Article Dans Une Revue Journal of Cosmology and Astroparticle Physics Année : 2025

On the Hamilton-Jacobi approach to inflation beyond slow roll

Résumé

The Hamilton-Jacobi approach is a powerful tool to describe super-Hubble dynamics during cosmological inflation in a non-linear way. A key assumption of this framework is to neglect anisotropic perturbations on large scales. We show that neglecting the anisotropic sector in the momentum constraint corresponds to discarding the non-adiabatic mode of scalar-field perturbations at large scales. Consequently, the Hamilton-Jacobi approach cannot be used to describe the evolution of large-scale perturbations during inflation beyond slow roll, when non-adiabatic fluctuations play an important role on super-Hubble scales due to the absence of an attractor trajectory. As an example, we analyse the case of cosmological perturbations during a phase of ultra-slow-roll inflation.

Fichier principal
Vignette du fichier
Artigas_2025_J._Cosmol._Astropart._Phys._2025_032.pdf (730.63 Ko) Télécharger le fichier
Origine Publication financée par une institution
Licence

Dates et versions

hal-05034838 , version 1 (26-08-2025)

Licence

Identifiants

Citer

Danilo Artigas, Emmanuel Frion, Tays Miranda, Vincent Vennin, David Wands. On the Hamilton-Jacobi approach to inflation beyond slow roll. Journal of Cosmology and Astroparticle Physics, 2025, 2025 (08), pp.032. ⟨10.1088/1475-7516/2025/08/032⟩. ⟨hal-05034838⟩
177 Consultations
138 Téléchargements

Altmetric

Partager

  • More