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arxiv: 1411.3974 · v3 · pith:T2M2MMLWnew · submitted 2014-11-14 · 🌌 astro-ph.CO · gr-qc· hep-ph· hep-th

CMB probes on the correlated axion isocurvature perturbation

classification 🌌 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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