B-modes from Post-inflationary Gravitational Waves Sourced by Axionic Instabilities at Cosmic Reionization
| Autor: | Sida Lu, Michael R. Geller, Yuhsin Tsai |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Photon Cosmology and Nongalactic Astrophysics (astro-ph.CO) Field (physics) Gravitational wave Cosmic microwave background Astrophysics::Instrumentation and Methods for Astrophysics FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Polarization (waves) Dark photon High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Axion Reionization Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Physical Review |
| Popis: | We show that axion-like particles that only couple to invisible dark photons can generate visible B-mode 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) polarization at reionization, generating visible B-mode signatures for the next generation of CMB experiments for parameter ranges that satisfy the current experimental constraints. V2: 9 pages 2 figures. Improved the analysis by increasing the number of gauge modes from 100 to 200. Published in PRD. V1: 8 pages, 2 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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