Barceló Carlos, Liberati Stefano, Sonego Sebastiano, Visser Matt
Instituto de Astrofísica de Andalucía, CSIC, Camino Bajo de Huétor 50, 18008 Granada, Spain.
Phys Rev Lett. 2006 Oct 27;97(17):171301. doi: 10.1103/PhysRevLett.97.171301. Epub 2006 Oct 24.
We discuss the issue of quasiparticle production by "analogue black holes" with particular attention paid to the possibility of reproducing Hawking radiation in a laboratory. By constructing simple geometric acoustic models, we obtain a somewhat unexpected result: We show that, in order to obtain a stationary and Planckian emission of quasiparticles, it is not necessary to create a trapped region in the acoustic spacetime (corresponding to a supersonic regime in the fluid flow). It is sufficient to set up a dynamically changing flow asymptotically approaching a sonic regime with sufficient rapidity in laboratory time. This result is generic to curved-space quantum field theory, the "analogue spacetimes" we consider providing a guide to physical intuition, and a possible route to laboratory experiments.
我们讨论了“类黑洞”产生准粒子的问题，特别关注在实验室中重现霍金辐射的可能性。通过构建简单的几何声学模型，我们得到了一个有些出人意料的结果：我们表明，为了获得准粒子的稳态和普朗克辐射，在声学时空中（对应于流体流动中的超音速区域）并不需要创建一个俘获区域。在实验室时间内，设置一个动态变化的流，使其足够快地渐近接近声速区域就足够了。这个结果对于弯曲空间量子场论是普遍适用的，我们所考虑的“类时空”为物理直觉提供了指导，并且是实验室实验的一条可能途径。
