Probing Oscillons of Ultra-Light Axion-like Particle by 21cm Forest

Abstract

Ultra-Light Axion-like Particle (ULAP) is motivated as one of the solutions to the small scale problems in astrophysics. When such a scalar particle oscillates with an $\mathcal{O}(1)$ amplitude in a potential shallower than quadratic, it can form a localized dense object, oscillon. Because of its longevity due to the approximate conservation of the adiabatic invariant, it can survive up to the recent universe as redshift $z\sim \mathcal{O}(10)$. The scale affected by these oscillons is determined by the ULAP mass $m$ and detectable by observations of 21cm line. In this paper, we examine the possibility to detect ULAP by 21cm line and find that the oscillon can enhance the signals of 21cm line observations when $m\lesssim 10^{-19}\mathrm{eV}$ and the fraction of ULAP to dark matter is much larger than $10^{-2}$ depending on the form of the potential.

20 pages, 6 figures

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Cited by in corpus (9)

• The Structure of the Oscillon: The Dynamics of Attractive Self-Interaction
• Gravitational effects on oscillon lifetimes
• Non-topological solitons and quasi-solitons
• 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
• Impact of dark matter-baryon relative velocity on the 21cm forest
• Boosting the 21 cm forest signals by the clumpy substructures
• Prospects of a statistical detection of the 21-cm forest and its potential to constrain the thermal state of the neutral IGM during reionization
• Analytical modeling of the one-dimensional power spectrum of 21-cm forest based on a halo model method