Kinetically stabilized inflation by Changhong Li et al. on Monday 21 November
In this work, we propose a string-inspired two fields inflation model to
address the fine-tuning problem that the standard inflation model suffers. The
fast-rolling tachyon $\mathcal{T}$ originated from the D-brane and anti-D-brane
pair annihilation locks the inflaton $\varphi$ slowly rolling on a Higgs-like
potential $V(\varphi)=-m_\varphi^2\varphi^2+\lambda \varphi^4$ and drives a
kinetically stabilized (KS) inflation. Our numerical simulation confirms such a
solution is a dynamic attractor. In particular, for $\lambda< 0.8\times
10^{-3}$, the e-folding number contributed by the KS inflation phase can be
larger than $62$ to solve the horizon and flatness problems of Big Bang theory.
Notably, this KS inflation generates a nearly scale-invariant primordial
curvature perturbations spectrum consistent with current cosmic microwave
background (CMB) observations. It predicts a low tensor-to-scalar ratio, which
the current primordial gravitational wave background (the B-modes in CMB)
searches favor.
arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.11440v1
