CMB probes on the correlated axion isocurvature perturbation
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🌌 astro-ph.CO
gr-qchep-phhep-th
keywords
axioncross-correlationdataisocurvatureaxion-likebackgroundconcreteconsequence
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We explore the possible cosmological consequence of the gravitational coupling between the inflaton and axion-like fields. In view of the forthcoming cosmic microwave background (CMB) polarization and lensing data, we study the sensitivity of the CMB data on the cross-correlation between the curvature and axion isocurvature perturbations. Through a concrete example, we illustrate the explicit dependence of the scale dependent cross-correlation power spectrum on the axion parameters.
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