论文标题
自主系统内的自由能转导
Free-energy transduction within autonomous systems
论文作者
论文摘要
通过时间依赖的外部扰动将随机系统从热力学平衡中驱逐出来所需的多余工作与驾驶过程中产生的熵量直接相关，从而使多余的工作和熵产生可以互换以量化耗散。鉴于生物分子机器作为组件之间内部交流工作的共同直觉，因此很容易将这种对应扩展到另一个组件的驱动到另一个组件的驱动。但是，内部过量工作与熵产生之间没有这种关系。在这里，我们介绍了自主系统的强耦合子系统之间的“转导的额外自由率”，这类似于由外部控制参数驱动的系统中的过剩功率，该系统未从系统中收到任何反馈。我们证明这是耗散的相关度量 - 因为它等于由于下游子系统而引起的稳态熵生产率 - 并通过简单的模型系统证明了其优势。
The excess work required to drive a stochastic system out of thermodynamic equilibrium through a time-dependent external perturbation is directly related to the amount of entropy produced during the driving process, allowing excess work and entropy production to be used interchangeably to quantify dissipation. Given the common intuition of biological molecular machines as internally communicating work between components, it is tempting to extend this correspondence to the driving of one component of an autonomous system by another; however, no such relation between the internal excess work and entropy production exists. Here we introduce the `transduced additional free energy rate' between strongly coupled subsystems of an autonomous system, that is analogous to the excess power in systems driven by an external control parameter that receives no feedback from the system. We prove that this is a relevant measure of dissipation -- in that it equals the steady-state entropy production rate due to the downstream subsystem -- and demonstrate its advantages with a simple model system.
