Journal
PHYSICAL REVIEW D
Volume 100, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.100.125021
Keywords
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Funding
- JSPS KAKENHI [17H01131, 17K05434]
- MEXT KAKENHI [15H05889, 16H03991, 17H02878, 18H05542]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- JSPS [19J12936]
- Grants-in-Aid for Scientific Research [19J12936] Funding Source: KAKEN
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An I-ball/oscillon is a solitonlike oscillating configuration of a real scalar field, and defined as a minimum energy state for a given adiabatic invariant. It lasts for a long time because of the approximate conservation of their adiabatic invariant. In this paper, we examine the stability of a special type of I-ball/oscillon, the exact I-ball/oscillon, whose adiabatic invariant is exactly conserved. We show that the exact I-ball/oscillon is generally stable in classical field theory, but one with a certain adiabatic invariant is unstable against small perturbations because fluctuations around the exact I-ball/oscillon profile have instability bands. Accordingly, the exact I-ball/oscillon breaks up in the presence of the fluctuations of corresponding instability modes. We also confirm the fragileness of the exact I-ball/oscillon by the classical lattice simulation.
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