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Wilson line inflation

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Abstract

We present a general setup 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 considered in heterotic string models. We provide explicit examples to illustrate similarities and differences of our mechanism to D-brane inflation. In particular we present an example in which the η problem present in brane inflation models is absent in our case. We have examples with both blue and red tilted spectral index and remnant cosmic string tension \(G\mu \lesssim 10^{-7}\) .

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Authors and Affiliations

  1. Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA, UK

    A. Avgoustidis, D. Cremades & F. Quevedo

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  1. A. Avgoustidis
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  2. D. Cremades
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  3. F. Quevedo
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Correspondence to F. Quevedo.

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Avgoustidis, A., Cremades, D. & Quevedo, F. Wilson line inflation. Gen Relativ Gravit 39, 1203–1234 (2007). https://doi.org/10.1007/s10714-007-0454-y

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