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Constraining inflationary magnetogenesis and reheating via GWs in light of PTA data
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By leveraging the limits on primordial magnetic fields (PMFs), their contributions to secondary gravitational waves (GWs), and the recent observations by the pulsar timing arrays (PTAs), we arrive at constraints on the epoch of reheating. We find that the combined spectral energy density of primary and secondary (generated by the PMFs) GWs can be described as a broken power law with different indices. We show that PMFs with blue spectra and appropriate reheating scenarios can successfully explain the PTA observations without invoking any new physics.
Forward citations
Cited by 2 Pith papers
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Magnetically assisted primordial scalar perturbations: Scalar-Induced Gravitational Waves
PMF-sourced scalar perturbations during a kination-like reheating can induce a gravitational-wave background that dominates over the direct PMF tensor signal and may be detectable at mHz-kHz frequencies.
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Magnetogenesis from Sawtooth Coupling: Gravitational Wave Probe of Reheating
A sawtooth coupling active during reheating can generate blue-tilted magnetic fields whose secondary gravitational waves peak at nanohertz to millihertz frequencies.
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