Fragileness of exact I-ball/oscillon
Fragileness of exact I-ball/oscillon
复制标题
精确 I-ball/oscillon 的脆弱性
DOI：
10.1103/physrevd.100.125021
复制
发表时间：
2019
影响因子：
5
通讯作者：
Sonomoto Eisuke
中科院分区：
文献类型：
--
作者：
Ibe Masahiro;Kawasaki Masahiro;Nakano Wakutaka;Sonomoto Eisuke
球/振子是实标量场的类孤子振荡态，定义为给定绝热不变量的最小能级。由于它们的绝热不变量的近似守恒性，它能持续很长时间。本文研究了绝热不变量完全守恒的一种特殊的球/振子--“精确”球/振子的稳定性。我们发现，在经典场论中，精确球/振子一般是稳定的，但具有一定绝热不变量的精确球/振子对小扰动是不稳定的，因为精确球/振子轮廓周围的涨落有不稳定带。相应地，精确球/振子在相应不稳定模的涨落中破裂。我们还用经典晶格模拟证实了精确球/振子的脆性。
An-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-ball/oscillon, the “exact”-ball/oscillon, whose adiabatic invariant is exactly conserved. We show that the exact-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-ball/oscillon profile have instability bands. Accordingly, the exact-ball/oscillon breaks up in the presence of the fluctuations of corresponding instability modes. We also confirm the fragileness of the exact-ball/oscillon by the classical lattice simulation.