Post-inflationary axion isocurvature perturbations facing CMB and large-scale structure

• Verfasst von: Feix, Martin [VerfasserIn]
• Verfasst von: Hagstotz, Steffen [VerfasserIn]
• Verfasst von: Pargner, Andreas [VerfasserIn]
• Verfasst von: Reischke, Robert [VerfasserIn]
• Verfasst von: Schäfer, Björn Malte [VerfasserIn]
• Verfasst von: Schwetz-Mangold, Thomas [VerfasserIn]
• Titel: Post-inflationary axion isocurvature perturbations facing CMB and large-scale structure
• Verf.angabe: M. Feix, S. Hagstotz, A. Pargner, R. Reischke, B.M. Schäfer, T. Schwetz
• Jahr: 2020
• Umfang: 26 S.
• Fussnoten: Gesehen am 14.09.2020
• Titel Quelle: Enthalten in: De.arxiv.org
• Ort Quelle: [S.l.] : Arxiv.org, 1991
• Jahr Quelle: 2020
• Band/Heft Quelle: (2020) Artikel-Nummer 2004.02926, 26 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Astrophysics - Cosmology and Nongalactic Astrophysics
• Sach-SW: High Energy Physics - Phenomenology
• K10plus-PPN: 1732424829

Abstract

Dark matter comprised of axion-like particles (ALPs) generated by the realignment mechanism in the post-inflationary scenario leads to primordial isocurvature fluctuations. The power spectrum of these fluctuations is flat for small wave numbers, extending to scales accessible with cosmological surveys. We use the latest measurements of Cosmic Microwave Background (CMB) primary anisotropies together with CMB lensing, Baryonic Acoustic Oscillations (BAO) and Sunyaev Zel'dovich (SZ) cluster counts to measure the amplitude and tilt of the isocurvature component. We find preference for a white-noise isocurvature component in the CMB primary anisotropies; this conclusion is, however, weakened by current large-scale structure (LSS) data. Interpreting the result as a conservative upper limit on the isocurvature component, the combined bound on the ALP mass from all probes is $m_{a} \gtrsim 10^{-19}$ eV, with some dependence on how $m_{a}$ evolves with temperature. The expected sensitivity of cosmic shear and galaxy clustering from future LSS experiments and CMB lensing suggests improved bounds of $m_{a} \gtrsim 10^{-18}$-$10^{-13}$ eV, depending on scale cuts used to avoid non-linearities and the ALP mass-temperature dependence.