V-mode Polarization in Axion Inflation and Preheating

Abstract

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)

17 pages. v2: typos corrected, references added. v3: added review section on circular polarization (section II), references added. Matches version to appear in Phys. Rev. D

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Cited by in corpus (12)

• Phenomenology of fermion production during axion inflation
• Implications of Gravitational-wave Production from Dark Photon Resonance to Pulsar-timing Observations and Effective Number of Relativistic Species
• CMB circular and B-mode polarization from new interactions
• Generation of circular polarization in CMB radiation via nonlinear photon-photon interaction
• Probing large-scale magnetism with the Cosmic Microwave Background
• CMB $V$ modes from photon-photon forward scattering revisited
• Physics Beyond The Standard Model with Circular Polarization in the CMB and CMB-21cm Cross-Correlation
• Multifield Reheating after Modular $j$-Inflation
• Universality of linear perturbations in SU($N$)-natural inflation
• Circularly Polarized EM Radiation from GW Binary Sources
• Primordial Circular Polarization in the Cosmic Microwave Background
• Big Bang Nucleosynthesis constraints on the cosmological evolution in a Universe with a Weylian Boundary