On the Possibility of Large Axion Decay Constants

Details On the Possibility of Large Axion Decay Constants On the Possibility of Large Axion Decay Constants

2003-03-28

arxiv.org/abs/hep-th/0303252v2

JCAP 0306 (2003) 001

Physics

High Energy Physics

High Energy Physics - Theory

17 pages, no figures, minor change made

Scientific paper

10.1088/1475-7516/2003/06/001

The decay constant of the QCD axion is required by observation to be small compared to the Planck scale. In theories of "natural inflation," and certain proposed anthropic solutions of the cosmological constant problem, it would be interesting to obtain a large decay constant for axion-like fields from microscopic physics. String theory is the only context in which one can sensibly address this question. Here we survey a number of periodic fields in string theory in a variety of string vacua. In some examples, the decay constant can be parameterically larger than the Planck scale but the effective action then contains appreciable harmonics of order $f_A/M_p$. As a result, these fields are no better inflaton candidates than Planck scale axions.

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