Primordial non-gaussianities of gravitational waves in the most general single-field inflation model with second-order field equations - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2011

Primordial non-gaussianities of gravitational waves in the most general single-field inflation model with second-order field equations

Résumé

We completely clarify the feature of primordial non-Gaussianities of tensor perturbations in the most general single-field inflation model with second-order field equations. It is shown that the most general cubic action for the tensor perturbation hij is composed only of two contributions, one with two spacial derivatives and the other with one time derivative on each hij. The former is essentially identical to the cubic term that appears in Einstein gravity and predicts a squeezed shape, while the latter newly appears in the presence of the kinetic coupling to the Einstein tensor and predicts an equilateral shape. Thus, only two shapes appear in the graviton bispectrum of the most general single-field inflation model, which could open a new clue to the identification of inflationary gravitational waves in observations of cosmic microwave background anisotropies as well as direct detection experiments.
Fichier principal
Vignette du fichier
gao2011.pdf (1.6 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

insu-03645846 , version 1 (24-04-2022)

Identifiants

Citer

Xian Gao, Tsutomu Kobayashi, Masahide Yamaguchi, Jun'Ichi Yokoyama. Primordial non-gaussianities of gravitational waves in the most general single-field inflation model with second-order field equations. Physical Review Letters, 2011, 107, pp.211301. ⟨10.1103/PhysRevLett.107.211301⟩. ⟨insu-03645846⟩
57 Consultations
9 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More