Corpus ID: 233296896

B-modes from Post-inflationary Gravitational Waves Sourced by Axionic Instabilities at Cosmic Reionization

@inproceedings{Geller2021BmodesFP,
  title={B-modes from Post-inflationary Gravitational Waves Sourced by Axionic Instabilities at Cosmic Reionization},
  author={M. Geller and Sida Lu and Yuhsin Tsai},
  year={2021}
}
We show that axion-like particles that only couple to invisible dark photons can generate visible Bmode signals around the reionization epoch. The axion field starts rolling shortly before reionization, resulting in a tachyonic instability for the dark photons. This generates an exponential growth of the dark photon quanta sourcing both scalar metric modes and gravitational waves that leave an imprint on the reionized baryons. The tensor modes modify the cosmic microwave background (CMB… Expand

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