Wilson Line Inflation
A. Avgoustidis, D. Cremades, F. Quevedo

TL;DR
This paper introduces a novel string theory inflation model where the inflaton is a Wilson line, connecting various D-brane inflation scenarios and allowing for hybrid inflation with potential observational signatures like cosmic strings.
Contribution
It develops a generalized framework for Wilson line inflation in string theory, linking it to existing models and addressing issues like the eta-problem, with explicit examples and phenomenological implications.
Findings
The model can avoid the eta-problem common in brane inflation.
It produces spectral indices with both blue and red tilts.
Remnant cosmic string tension is constrained to Gμ ≲ 10^{-7}.
Abstract
We present a general set-up for inflation in string theory where the inflaton field corresponds to Wilson lines in compact space in the presence of magnetic fluxes. T-dualities and limits on the value of the magnetic fluxes relate this system to the standard D-brane inflation scenarios, such as brane-antibrane inflation, D3/D7 brane inflation and different configurations of branes at angles. This can then be seen as a generalised approach to inflation from open string modes. Inflation ends when the Wilson lines achieve a critical value and an open string mode becomes tachyonic. Then hybrid-like inflation, including its cosmic string remnants, is realized in string theory beyond the brane annihilation picture. Our formalism can be incorporated within flux-induced moduli stabilisation mechanisms in type IIB strings. Also, contrary to the standard D-brane separation, Wilson lines can be…
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