"Old" Locked Inflation

Abstract

In this paper, we revisit the idea of locked inflation, which does not require a potential satisfying the normal slow-roll condition, but suffers from the problems associated with "saddle inflation". We propose a scenario based on locked inflation, however, with an alternative evolution mechanism of the "waterfall field" $\varphi$. Instead of rolling down along the potential, the $\varphi$ field will tunnel to end the inflation stage like in old inflation, by which the saddle inflation could be avoided. Further, we study a cascade of old locked inflation, which can be motivated by the string landscape. Our model is based on the consideration of making locked inflation feasible so as to give a working model without slow roll; It also can be seen as an effort to embed the old inflation in string landscape.

18 pages, 3 figures, references added

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• The Low-Energy Frontier of Particle Physics
• Intermittent null energy condition violations during inflation and primordial gravitational waves
• Trans-Planckian censorship of multistage inflation and dark energy
• Search for weakly interacting sub-eV particles with the OSQAR laser-based experiment: results and perspectives
• Inflation in a Web
• Preheating in Bubble Collisions