Phys. Rev. Lett. 90, 221302 (2003) [4 pages]Extranatural InflationReceived 13 February 2003; published 5 June 2003 We present a new model of inflation in which the inflaton is the extra component of a gauge field in a 5D theory compactified on a circle. The chief merit of this model is that the potential comes only from nonlocal effects so that its flatness is not spoiled by higher-dimensional operators or quantum gravity corrections. The model predicts a red spectrum (n≃0.96) and a significant production of gravitational waves (r≃0.11). We also comment on the relevance of this idea to quintessence. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.221302
DOI:
10.1103/PhysRevLett.90.221302
PACS:
98.80.Cq, 11.10.Kk
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