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arXiv 1101.4593nlin.CD
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耗散二维不可积含时台球的边界危机与费米加速度的抑制

Boundary crisis and suppression of Fermi acceleration in a dissipative two dimensional non-integrable time-dependent billiard

Diego F. M. Oliveira, Edson D. Leonel

摘要:

研究了耗散含时椭圆形台球系统的动力学性质。该系统被描述在一个四维非线性映射。耗散是通过粒子与边界的非弹性碰撞引入的,因此意味着粒子在碰撞时具有部分能量损失。耗散引起粒子动力学和非耗散系统相空间的深刻变化。特别是,非弹性碰撞可以被假定为抑制粒子费米加速的有效机制。耗散也在系统中产生吸引子,包括混沌。我们表明,阻尼系数的强度略有修改产生了激烈的和突然的破坏的混沌吸引子,从而导致系统经历一个边界危机。我们已经通过混沌吸引子与其自身吸引域的碰撞表征了这样的边界危机,并证实了非弹性碰撞确实抑制了二维时间相关台球中的费米加速。

英文摘要:

Some dynamical properties for a dissipative time-dependent oval-shaped billiard are studied. The system is described in terms of a four-dimensional nonlinear mapping. Dissipation is introduced via inelastic collisions of the particle with the boundary, thus implying that the particle has a fractional loss of energy upon collision. The dissipation causes profound modifications in the dynamics of the particle as well as in the phase space of the non dissipative system. In particular, inelastic collisions can be assumed as an efficient mechanism to suppress Fermi acceleration of the particle. The dissipation also creates attractors in the system, including chaotic. We show that a slightly modification of the intensity of the damping coefficient yields a drastic and sudden destruction of the chaotic attractor, thus leading the system to experience a boundary crisis. We have characterized such a boundary crisis via a collision of the chaotic attractor with its own basin of attraction and confirmed that inelastic collisions do indeed suppress Fermi acceleration in two-dimensional time dependent billiards.

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