Abstract
We continue our investigation of the 4d effective field theory for closed string axions in Type II compactifications with D-branes. The inclusion of St\"uckelberg couplings for the axions requires the presence of chiral fermions at D-brane intersections, whose interactions at strong non-Abelian gauge coupling induce mass terms for the axions and scalar chiral condensate excitations, dubbed infladrons. The set-up allows for a realization of natural-like inflation with a closed string axion as inflaton and a flattened scalar potential due to the back-reaction of the more massive infladrons. We further point out that this large field inflationary model is not compromised by axionic wormhole corrections.
Highlights
Axions or axionlike particles arise abundantly [1,2,3] when ten-dimensional superstring theories are compactified to a four-dimensional spacetime
With the Betti number bp giving the dimensionality of the homology group HpðM; RÞ. As their perturbative interactions are fully constrained by their continuous shift symmetry, axions provide for Lagrangians suitable to accommodate beyond the standard model physics, both in particle physics [4,5,6] as well as in cosmology [7,8]
The shift symmetry is invoked in inflationary models to prevent a violation of the slow-roll conditions by uncontrollable perturbative corrections
Summary
Axions or axionlike particles arise abundantly [1,2,3] when ten-dimensional superstring theories are compactified to a four-dimensional spacetime. A lot of attention has been devoted to the breaking of the global axion shift symmetry to a discrete one following the coupling to a four form [10] These axion-4-form couplings (which have been applied to inflation in [11]) appear naturally for closed string axions in type II string theory compactifications with internal Ramond-Ramond fluxes and Neveu-Schwarz fluxes [12,13], and represent a realization of the axion monodromy scenarios proposed in [14,15]. The matrix Gij represents the metric on the axion moduli space, whose entries depend on the closed string metric moduli (the saxionic partners belonging to the same N 1⁄4 1 4D supermultiplet as the closed string axions) and are assumed to be stabilized In this model, a linear axionic combination is eaten away by the Uð1Þ gauge boson, while the orthogonal direction ξ is subjected to a potential resulting from the anomalous coupling to the non-Abelian gauge group. Figure offers a schematic view of the axion moduli space, including all possible mixing effects and couplings for the closed string axions in the presence of D-branes
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