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Article Dans Une Revue Physical Review Letters Année : 2024

Why does inflation look single field to us?

Résumé

Most high-energy constructions that realise a phase of cosmic inflation contain many degrees of freedom. Yet, cosmological observations are all consistent with single-field embeddings. We show how volume selection effects explain this apparent paradox. Due to quantum diffusion, different regions of space inflate by different amounts. In regions that inflate most, and eventually dominate the volume of the universe, a generic mechanism is unveiled that diverts the inflationary dynamics towards single-field attractors. The formalism of constrained stochastic inflation is developed to this end.

Dates et versions

hal-04273939 , version 1 (07-11-2023)

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Koki Tokeshi, Vincent Vennin. Why does inflation look single field to us?. Physical Review Letters, 2024, 132 (25), pp.251001. ⟨10.1103/PhysRevLett.132.251001⟩. ⟨hal-04273939⟩
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