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V-mode Polarization in Axion Inflation and Preheating
classification
🌀 gr-qc
astro-ph.COhep-phhep-th
keywords
axiondirectinflationpolarizationproductionspectrumv-modeattention
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We study the production of primordial circular ("V-mode") polarization in axion inflation coupled to fermions and gauge fields, with special attention paid to (p)reheating. We construct the power spectrum of $V$, and find a blue-tilted spectrum with index $n_V=4$. This is independent of the dominant decay channel of the inflaton (direct fermion vs. direct photon production)
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