arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0807.2348cond-mat.stat-mech
收藏

精确射击:长过渡路径采样

Precision shooting: Sampling long transition pathways

M. Grünwald, P. L. Geissler, C. Dellago

摘要:

溶液中集体重排的动力学,如蛋白质折叠和相变相变,通常涉及既长又粗糙的自由能势垒。应用过渡路径采样的方法来收获模拟的轨迹,该轨迹模拟这样的过程通常是困难的,因为新生成的轨迹的接受率非常低。我们解决这个问题,通过引入一个新的一代算法的基础上的线性短时行为的小扰动相空间。使用这种"精确射击“技术,可以及时传播任意小的干扰,并且可以获得任何期望的射击动作的接受率。我们证明了一个简单的,但计算上有问题的异构化过程中的稠密液体软球的方法。我们还讨论了它的适用性势垒跨越事件涉及亚稳态中间状态。

英文摘要:

The kinetics of collective rearrangements in solution, such as protein folding and nanocrystal phase transitions, often involve free energy barriers that are both long and rough. Applying methods of transition path sampling to harvest simulated trajectories that exemplify such processes is typically made difficult by a very low acceptance rate for newly generated trajectories. We address this problem by introducing a new generation algorithm based on the linear short-time behavior of small disturbances in phase space. Using this ``precision shooting'' technique, arbitrarily small disturbances can be propagated in time, and any desired acceptance ratio of shooting moves can be obtained. We demonstrate the method for a simple but computationally problematic isomerization process in a dense liquid of soft spheres. We also discuss its applicability to barrier crossing events involving metastable intermediate states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑