Stable Neutral Fermi Ball

Abstract

Fermi Ball is a kind of nontopological soliton with fermions trapped in its domain wall, and is suggested to arises from the spontaneous symmetry breaking of the approximate $Z_2$ symmetry in the early universe. We find that the neutral thin-wall Fermi Ball is stable in the limited region of the scalar self-coupling constant $\lambda$ and the Yukawa coupling constant $G$. We find that the Fermi Ball is stabilized due to the curvature effect of the domain wall caused by the fermion sector. We also discuss whether such stable Fermi Balls may contribute to the cold dark matter.

18 pages in RevTeX, 5 figures

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• Final results of magnetic monopole searches with the MACRO experiment
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Cited by in corpus (4)

• Discovery prospects for heavy dark matter in KAGRA
• Stability of a class of neutral vacuum bubbles
• Models of ultra-heavy dark matter visible to macroscopic mechanical sensing arrays
• Stability of Neutral Fermi Balls with Multi-Flavor Fermions