| Автор | Katherine J. Mack |
| Дата выпуска | 2011-07-01 |
| dc.description | The QCD axion is the leading solution to the strong-CP problem, a dark matter candidate, and a possible result of string theory compactifications. However, for axions produced before inflation, symmetry-breaking scales of f<sub>a</sub>≳10<sup>12</sup> GeV (which are favored in string-theoretic axion models) are ruled out by cosmological constraints unless both the axion misalignment angle θ<sub>0</sub> and the inflationary Hubble scale H<sub>I</sub> are extremely fine-tuned. We show that attempting to accommodate a high-f<sub>a</sub> axion in inflationary cosmology leads to a fine-tuning problem that is worse than the strong-CP problem the axion was originally invented to solve. We also show that this problem remains unresolved by anthropic selection arguments commonly applied to the high-f<sub>a</sub> axion scenario. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Axions, inflation and the anthropic principle |
| Тип | paper |
| DOI | 10.1088/1475-7516/2011/07/021 |
| Electronic ISSN | 1475-7516 |
| Журнал | Journal of Cosmology and Astroparticle Physics |
| Том | 2011 |
| Первая страница | 21 |
| Последняя страница | 021 |
| Аффилиация | Katherine J. Mack; Kavli Institute for Cosmology, Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, U.K. |
| Выпуск | 07 |
