2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/173393In this paper, in a class of warped compactifications with the brane/flux annihilation, we find that the inflation may be driven by a flat direction identified as that along the number p of anti D3-branes located at the tip of the Klebanov-Strassler throat. The spectrum of adiabatic perturbation generated during inflation is nearly scale invariant, which may be obtained by using the results shown in the phantom inflation, since in a four-dimension effective description the evolution of energy density along the $p$ direction is slowly increasing.5 pages, 2 figures, some arguments on the reliability of our resulits added, ref. added, to publish in PRD, matched to published versionGeneral Relativity and Quantum Cosmologytext