The Gbar project, or how does antimatter fall?

The Gbar project, or how does antimatter fall?
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Gbar项目,或者说反物质是如何坠落的?

DOI:
10.1007/s10751-014-1019-6
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发表时间:
2014
影响因子:
--
通讯作者:
Indelicato P
Indelicato P
中科院分区:
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作者:
Indelicato P

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爱因斯坦经典弱等效原理指出,当粒子仅受到引力作用时,其轨迹与其组成和内部结构无关。这一基本原理从未用反物质进行过直接测试。然而,诸如超重力之类的理论模型可能包含引起排斥重力的成分,从而违反了这一原理。 GBAR项目(静止时反氢的引力行为)提议测量地球引力场中超冷中性反氢原子的自由落体加速度。该实验包括制备反氢离子(一个反质子和两个正电子)并用 Be+ 离子将它们冷却到几个 10μK。然后超冷离子将在阈值以上被光电离,并测量已知距离上的自由落体时间。在这项工作中,描述了 GBAR 项目以及可能的改进,即利用表面上的反氢的量子反射来使用量子测量方法。
The Einstein classical Weak Equivalence Principle states that the trajectory of a particle is independent of its composition and internal structure when it is only submitted to gravitational forces. This fundamental principle has never been directly tested with antimatter. However, theoretical models such as supergravity may contain components inducing repulsive gravity, thus violating this principle. The GBAR project (Gravitational Behaviour of Antihydrogen at Rest) proposes to measure the free fall acceleration of ultracold neutral antihydrogen atoms in the terrestrial gravitational field. The experiment consists in preparing antihydrogen ions (one antiproton and two positrons) and sympathetically cool them with Be+ions to a few 10μK. The ultracold ions will then be photoionized just above threshold, and the free-fall time over a known distance measured. In this work, the GBAR project is described as well as possible improvements that use quantum reflection of antihydrogen on surfaces to use quantum methods of measurements.
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