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  Effective field theory of weakly coupled inflationary models

Gwyn, R., Palma, G. A., Sakellariadou, M., & Sypsas, S. (2013). Effective field theory of weakly coupled inflationary models. Journal of Cosmology and Astroparticle Physics, 04: 004. doi:10.1088/1475-7516/2013/04/004.

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1210.3020 (Preprint), 337KB
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 Urheber:
Gwyn, Rhiannon1, Autor           
Palma, Gonzalo A., Autor
Sakellariadou, Mairi, Autor
Sypsas, Spyros, Autor
Affiliations:
1Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE, ou_24014              

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Schlagwörter: High Energy Physics - Theory, hep-th,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO,General Relativity and Quantum Cosmology, gr-qc,High Energy Physics - Phenomenology, hep-ph
 Zusammenfassung: The application of Effective Field Theory (EFT) methods to inflation has taken a central role in our current understanding of the very early universe. The EFT perspective has been particularly useful in analyzing the self-interactions determining the evolution of co-moving curvature perturbations (Goldstone boson modes) and their influence on low-energy observables. However, the standard EFT formalism, to lowest order in spacetime differential operators, does not provide the most general parametrization of a theory that remains weakly coupled throughout the entire low-energy regime. Here we study the EFT formulation by including spacetime differential operators implying a scale dependence of the Goldstone boson self-interactions and its dispersion relation. These operators are shown to arise naturally from the low-energy interaction of the Goldstone boson with heavy fields that have been integrated out. We find that the EFT then stays weakly coupled all the way up to the cutoff scale at which ultraviolet degrees of freedom become operative. This opens up a regime of new physics where the dispersion relation is dominated by a quadratic dependence on the momentum $\omega \sim p^2$. In addition, provided that modes crossed the horizon within this energy range, the prediction of inflationary observables --including non-Gaussian signatures-- are significantly affected by the new scales characterizing it.

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 Datum: 2012-10-102013
 Publikationsstatus: Erschienen
 Seiten: 30+4 pages
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 Identifikatoren: arXiv: 1210.3020
DOI: 10.1088/1475-7516/2013/04/004
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Titel: Journal of Cosmology and Astroparticle Physics
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Bristol, England : Institute of Physics Pub.
Seiten: - Band / Heft: 04 Artikelnummer: 004 Start- / Endseite: - Identifikator: ISSN: 1475-7516
CoNE: https://pure.mpg.de/cone/journals/resource/111055183238000_1