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Effective Field Theory of Anisotropic Inflation and Beyond

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arxiv 1910.11533 v2 pith:5I72ZGQI submitted 2019-10-25 hep-th astro-ph.COgr-qchep-ph

Effective Field Theory of Anisotropic Inflation and Beyond

Jinn-Ouk Gong , Toshifumi Noumi , Gary Shiu , Jiro Soda , Kazufumi Takahashi , Masahide Yamaguchi This is my paper
classification hep-th astro-ph.COgr-qchep-ph
keywords effectiveinflationactionanisotropicanisotropybeyondbosonsbreaking
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We develop an effective-field-theory (EFT) framework for inflation with various symmetry breaking pattern. As a prototype, we formulate anisotropic inflation from the perspective of EFT and construct an effective action of the Nambu-Goldstone bosons for the broken time translation and rotation symmetries. We also calculate the statistical anisotropy in the scalar two-point correlation function for concise examples of the effective action.

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  1. Isotropic universes with a preferred direction

    astro-ph.CO 2026-08 conditional novelty 7.0

    A tuned vector-field EFT can have an exactly isotropic FLRW background while hiding a preferred direction that reappears in perturbations as direction-dependent propagation and scalar–tensor mixing.