【摘要】 我们利用“连续化近似”的平均场理论,详细研究了在不同外场作用下DLA集团的标度性质。发现对常值外场,集团密度ρ初始时按1/r变化,然后过渡到一个常数值;而对1/r~o类型的外场。当控制参数α变化时,生长集团表现出非常复杂的、非平庸的标度行为。更多还原

【Abstract】 We have investigated the scaling properties of DLA clusters grown in the various kinds of external fields, using the meanfield theory with the continuum approximation. Our results show that the density of the growing cluster, ρ, initially dropping as 1/r, and becomes a constant value for constant external field. For the fields of type 1/ra we find that the aggre-.gates exhibit very complicated, non-trivial scaling behaviours with the control parameter a varying.更多还原