热对数势中Q球的形成及其性质
Formation of the Q ball in the thermal logarithmic potential and its properties
摘要：
本文用晶格模拟的方法研究了热对数势中Q球的形成，并定性地证实了Q球电荷与Affleck-Dine场振荡起始时振幅的关系。我们发现Q球的一些性质，如它的大小和在其中心的字段值的时间依赖性。由于热对数势随温度的降低而减小，重力介导势将影响Q球的性质。即使在重力中介势单独不允许Q球解的情况下，我们也发现了Q球从厚壁型到薄壁型的转变，这与当重力中介势在Q球中心占主导地位时Q球将立即被破坏的天真期望相反。
英文摘要：
We investigate the Q-ball formation in the thermal logarithmic potential by means of the lattice simulation, and reconfirm qualitatively the relation between Q-ball charge and the amplitude of the Affleck-Dine field at the onset of its oscillation. We find time dependence of some properties of the Q ball, such as its size and the field value at its center. Since the thermal logarithmic potential decreases as the temperature falls down, the gravity-mediation potential will affect the properties of the Q ball. Even in the case when the gravity-mediation potential alone does not allow Q-ball solution, we find the transformation from the thick-wall type of the Q ball to the thin-wall type, contrary to the naive expectation that the Q balls will be destroyed immediately when the gravity-mediation potential becomes dominant at the center of the Q ball.
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