Oscillon of Ultra-Light Axion-like Particle

Abstract

Ultra-light axion-like particle (ULAP) is one of attractive candidates for cold dark matter. Because the de Broglie wavelength of ULAP with mass $\sim 10^{-22}\mathrm{eV}$ is $\mathcal{O}(\mathrm{kpc})$, the suppression of the small scale structure by the uncertainty principle can solve the core-cusp problem. Frequently, ULAP is assumed to be uniformly distributed in the present universe. In typical ULAP potentials, however, strong self-resonance at the beginning of oscillation invokes the large fluctuations, which may cause the formation of the dense localized object, oscillon. % Such a dense object lives for a long time, it may affect the cosmological evolution. In this paper, we confirm the oscillon formation in a ULAP potential by numerical simulation and analytically derive its lifetime.

10 pages, 2 figures

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Cited by in corpus (11)

• Classical Decay Rates of Oscillons
• Friendship in the Axiverse: Late-time direct and astrophysical signatures of early-time nonlinear axion dynamics
• Oscillon formation from preheating in asymmetric inflationary potentials
• Nonperturbative structure in coupled axion sectors and implications for direct detection
• Oscillon spectroscopy
• Non-topological solitons and quasi-solitons
• Inclusion of radiation in the CCM approach of the ${\varphi }^4$ model
• Understanding oscillons: standing waves in a ball
• Anisotropies in Cosmological 21 cm Background by Oscillons/I-balls of Ultra-light Axion-like Particle
• Nonlinear dynamics of oscillons and transients during preheating after single field inflation
• Decay and lifetime of oscillons coupled to an external scalar field: Insights from instability band analysis