Testing the equivalence principle with atomic interferometry
Testing the equivalence principle with atomic interferometry
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DOI：
10.1088/0264-9381/29/18/184003
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发表时间：
2012-08
影响因子：
3.5
通讯作者：
S. Herrmann;H. Dittus;C. Lämmerzahl
中科院分区：
文献类型：
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作者：
S. Herrmann;H. Dittus;C. Lämmerzahl
弱等效原理（WEP），即自由落体的普遍性，指出引力场中的所有点状中性粒子以相同的方式下落。这是引力相互作用几何化的基础。结合对点粒子行为、光传播和时钟的进一步要求，我们可以证明重力是通过黎曼几何来建模的。由于在量子域中所有对象都是扩展的，因此尚不清楚量子域中 WEP 的概念是否有意义。我们表明，对于物质波干涉测量，WEP 的概念仍然可以被赋予意义。我们对允许违反 WEP 的方案进行了简短的概述，并强调还有一些方案表明在量子体系中可能存在违反 WEP 的情况，而这些方案在经典中并不存在。这使得用量子物质测试 WEP 成为必要。我们还简要概述了 QUANTUS 和 PRIMUS 合作在不来梅落塔中使用冷原子干涉测量法测试 WEP 所做的努力。
The weak equivalence principle (WEP), that is, the universality of free fall, states that all point-like neutral particles in a gravitational field fall in the same way. This is the basis of the geometrization of the gravitational interaction. Together with further requirements on the behavior of point particles, light propagation and clocks one can show that gravity is modeled by a Riemannian geometry. Since in the quantum domain all objects are extended, it is not clear whether the notion of a WEP in the quantum domain makes sense at all. We show that for matter wave interferometry the notion of WEP still can be given a meaning. We give a short overview over schemes which allows a violation of the WEP and emphasize that there are also schemes which show that there might be violations of the WEP in the quantum regime which are not present classically. This makes a test of the WEP with quantum matter necessary. We also give a brief outline of the efforts made for testing the WEP with interferometry with cold atoms in the Bremen drop tower carried out by the QUANTUS and PRIMUS collaboration.