Programme

O.15 -- Oral, VCTP-47

Date: Thursday, 4 August 2022

Time: 15:05 - 15:30

A novel k-Gauss-Bonnet power-law inflation model

Tuyen M. Pham(1,2), Duy H. Nguyen(1,2), and Tuan Q. Do(1)

(1) Phenikaa Institute for Advanced Study, Phenikaa University, Hanoi, Vietnam (2) Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam

We present a novel inflation model in a framework of the Einstein-scalar-Gauss-Bonnet gravity, where the Gauss-Bonnet topological invariant is allowed to non-minimally couple to the kinetic term of scalar field in the absence of the potential. Remarkably, this model gives an exact power-law solution in a framework of the isotropic and homogeneous universe, which is proved to be stable during the inflationary phase by using the dynamical system method. More interestingly, this model is shown to be free of a gradient instability in tensor perturbations.

Presenter: Pham Manh Tuyen