| Autor: |
Mathis, Dayshon, Mousatov, Alexandros, Panagopoulos, George, Silverstein, Eva |
| Předmět: |
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| Zdroj: |
Journal of High Energy Physics; Oct2021, Vol. 2021 Issue 10, p1-14, 14p |
| Abstrakt: |
We present a new mechanism for inflation which exhibits a speed limit on scalar motion, generating accelerated expansion even on a steep potential. This arises from explicitly integrating out the short modes of additional fields coupled to the inflaton ϕ via a dimension six operator, yielding an expression for the effective action which includes a nontrivial (logarithmic) function of (∂ϕ)2. The speed limit appears at the branch cut of this logarithm arising in a large flavor expansion, similarly to the square root branch cut in DBI inflation arising in a large color expansion. Finally, we describe observational constraints on the parameters of this model. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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