Primordial bispectrum from multifield inflation with nonminimal couplings
By David I. Kaiser, Edward A. Mazenc, Evangelos Sfakianakis. 2012
143 citations recorded by the source corpus.
Realistic models of high-energy physics include multiple scalar fields. Renormalization requires that the fields have nonminimal couplings to the spacetime Ricci curvature scalar, and the couplings can be large at the energy scales of early-universe inflation. The nonminimal couplings induce a nontrivial field-space manifold in the Einstein frame, and they also yield an effective potential in the Einstein frame with nontrivial curvature. The ridges or bumps in the Einstein-frame potential can lead to primordial non-Gaussianities of observable magnitude. We develop a covariant formalism to study perturbations in such models and calculate the primordial bispectrum. As in previous studies of non-Gaussianities in multifield models, our results for the bispectrum depend sensitively on the fields’ initial conditions.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/9be435efc8d9b3afc6f6372f5c16e56f50db7896
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Astronomy and Astrophysics
In Nuclear and High Energy Physics
Citations in the corpus
- Multi-field conformal cosmological attractors (2013, unknown): “This is somewhat different from what happens in the multi-filed Higgs inflation with nonminimal positive coupling ξ > 0 studied in [10], where the function in front of (∂μθ) 2 in the corresponding Lagrangian does not grow exponentially for large φ.”
- Higgs Inflation (2018, background): “Note, however, that this decoupling statement does not apply to scale-invariant extensions including additional scalar fields [85,87,91,106–108] or other non-conformal interactions such as R terms [1,109–111].”