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# Kinetically stabilized inflation

Nov 2022

In this work, we propose a string-inspired two fields inflation model toaddress the fine-tuning problem that the standard inflation model suffers. Thefast-rolling tachyon $\mathcal{T}$ originated from the D-brane and anti-D-branepair annihilation locks the inflaton $\varphi$ slowly rolling on a Higgs-likepotential $V(\varphi)=-m_\varphi^2\varphi^2+\lambda \varphi^4$ and drives akinetically stabilized (KS) inflation. Our numerical simulation confirms such asolution is a dynamic attractor. In particular, for $\lambda< 0.8\times10^{-3}$, the e-folding number contributed by the KS inflation phase can belarger than $62$ to solve the horizon and flatness problems of Big Bang theory.Notably, this KS inflation generates a nearly scale-invariant primordialcurvature perturbations spectrum consistent with current cosmic microwavebackground (CMB) observations. It predicts a low tensor-to-scalar ratio, whichthe current primordial gravitational wave background (the B-modes in CMB)searches favor.

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