HAL : hal-00485959, version 1

arXiv : 1005.3848

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Mass hierarchies and non-decoupling in multi-scalar field dynamics

Ana Achúcarro, Jinn-Ouk Gong, Sjoerd Hardeman, Gonzalo A. Palma, Subodh P. Patil 1, 2

(20/05/2010)

In this work we study the effects of field space curvature on scalar field perturbations around an arbitrary background field trajectory evolving in time. Non-trivial imprints of the `heavy' directions arise when the vacuum manifold of the potential does not coincide with the span of geodesics defined by the sigma model metric of the low energy effective theory. When the kinetic energy is small compared to the potential energy, the field traverses a curve close to the vacuum manifold of the potential. The curvature of the trajectory can still have a profound influence on the perturbations as modes parallel to the trajectory mix with those normal to the trajectory if the trajectory turns sharply enough. These effects could be important during inflation, which could lead to detectable effects in upcoming observations.

1 :	Laboratoire de Physique Théorique de l'ENS (LPTENS)
	CNRS : UMR8549 – Université Paris VI - Pierre et Marie Curie – Ecole Normale Supérieure de Paris - ENS Paris
2 :	Centre de Physique Théorique (CPHT)
	CNRS : UMR7644 – Polytechnique - X

Domaine

:

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Physique/Relativité Générale et Cosmologie Quantique Physique/Physique des Hautes Energies - Théorie

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Contributeur : Subodh Patil <>

Soumis le : Lundi 24 Mai 2010, 12:14:28

Dernière modification le : Lundi 24 Mai 2010, 12:14:28