Isocurvature forecast in the anthropic axion window

Details Isocurvature forecast in the anthropic axion window Isocurvature forecast in the anthropic axion window

2009-04-03

arxiv.org/abs/0904.0647v2

JCAP 0906:022,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 4 figures; v2: matches published version

Scientific paper

10.1088/1475-7516/2009/06/022

We explore the cosmological sensitivity to the amplitude of isocurvature fluctuations that would be caused by axions in the "anthropic window" where the axion decay constant f_a >> 10^12 GeV and the initial misalignment angle Theta_i << 1. In a minimal Lambda-CDM cosmology extended with subdominant scale-invariant isocurvature fluctuations, existing data constrain the isocurvature fraction to alpha < 0.09 at 95% C.L. If no signal shows up, Planck can improve this constraint to 0.042 while an ultimate CMB probe limited only by cosmic variance in both temperature and E-polarisation can reach 0.017, about a factor of five better than the current limit. In the parameter space of f_a and H_I (Hubble parameter during inflation) we identify a small region where axion detection remains within the reach of realistic cosmological probes.

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