21cm forest probes on the axion dark matter in the post-inflationary Peccei-Quinn symmetry breaking scenarios

Abstract

We study the future prospects of the 21cm forest observations on the axion-like dark matter when the spontaneous breaking of the global Peccei-Quinn (PQ) symmetry occurs after the inflation. The large isocurvature perturbations of order unity sourced from axion-like particles can result in the enhancement of minihalo formation, and the subsequent hierarchical structure formation can affect the minihalo abundance whose masses can exceed $\mathcal{O}(10^4)M_{\odot }$ relevant for the 21cm forest observations. We show that the 21cm forest observations are capable of probing the axion-like particle mass in the range $10^{-18}\lesssim m_a\lesssim 10^{-12}$ eV for the temperature independent axion mass. For the temperature dependent axion mass, the zero temperature axion mass scale for which the 21cm forest measurements can be affected is extended further to as big as of order $10^{-6}$ eV.

11 pages, 6 figures, published in PRD

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Cited by in corpus (12)

• 21 cm Forest Constraints on Primordial Black Holes
• Probing Oscillons of Ultra-Light Axion-like Particle by 21cm Forest
• Deep learning-driven likelihood-free parameter inference for 21-cm forest observations
• Anisotropies in Cosmological 21 cm Background by Oscillons/I-balls of Ultra-light Axion-like Particle
• Analyzing the 21cm forest with Wavelet Scattering Transform: Insight into non-Gaussian features of the 21cm forest
• Prospects of a statistical detection of the 21-cm forest and its potential to constrain the thermal state of the neutral IGM during reionization
• Impact of dark matter-baryon relative velocity on the 21cm forest
• Boosting the 21 cm forest signals by the clumpy substructures
• Survival of Gas in Subhalos and Its Impact on the 21 cm Forest Signals: Insights from Hydrodynamic Simulations
• How light can ALP dark matter be?
• Probing power spectrum enhancement at small scales with the SKA
• Efficient neutral-IGM inference from noisy 21-cm forest spectra with latent-space U-Net encoding and XGBoost