Inflating with the QCD Axion

Details Inflating with the QCD Axion Inflating with the QCD Axion

2005-02-21

arxiv.org/abs/hep-ph/0502177v3

Phys.Rev. D72 (2005) 123521

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 1 figure, revised for submission to PRL

Scientific paper

We show that the QCD axion can drive inflation via a series of tunneling events. For axion models with a softly broken $Z_N$ symmetry, the axion potential has a series of $N$ local minima and may be modeled by a tilted cosine. Chain inflation results along this tilted cosine: the field tunnels from an initial minimum near the top of the potential through a series of ever lower minima to the bottom. This results in sufficient inflation and reheating. QCD axions, potentially detectable in current searches, may thus simultaneously solve problems in particle physics and provide inflation.

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