Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-11-19
Phys.Rev.D84:026011,2011
Physics
High Energy Physics
High Energy Physics - Theory
20 pages, 2 figures. v2: new references added
Scientific paper
10.1103/PhysRevD.84.026011
We show how backreaction of the inflaton potential energy on heavy scalar fields can flatten the inflationary potential, as the heavy fields adjust to their most energetically favorable configuration. This mechanism operates in previous UV-complete examples of axion monodromy inflation - flattening a would-be quadratic potential to one linear in the inflaton field - but occurs more generally, and we illustrate the effect with several examples. Special choices of compactification minimizing backreaction may realize chaotic inflation with a quadratic potential, but we argue that a flatter potential such as power-law inflation $V(\phi) \propto \phi^p$ with $p<2$ is a more generic option at sufficiently large values of $\phi$.
Dong Xi
Horn Bart
Silverstein Eva
Westphal Alexander
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