DPHY, ONERA, Université Paris Saclay, F-92322 Châtillon, France.
Institut de Physique Théorique, Université Paris-Saclay, CEA, CNRS, F-91191 Gif-sur-Yvette Cedex, France.
Phys Rev Lett. 2018 Apr 6;120(14):141101. doi: 10.1103/PhysRevLett.120.141101.
The existence of a light or massive scalar field with a coupling to matter weaker than gravitational strength is a possible source of violation of the weak equivalence principle. We use the first results on the Eötvös parameter by the MICROSCOPE experiment to set new constraints on such scalar fields. For a massive scalar field of mass smaller than 10^{-12} eV (i.e., range larger than a few 10^{5} m), we improve existing constraints by one order of magnitude to |α|<10^{-11} if the scalar field couples to the baryon number and to |α|<10^{-12} if the scalar field couples to the difference between the baryon and the lepton numbers. We also consider a model describing the coupling of a generic dilaton to the standard matter fields with five parameters, for a light field: We find that, for masses smaller than 10^{-12} eV, the constraints on the dilaton coupling parameters are improved by one order of magnitude compared to previous equivalence principle tests.
存在一个与物质耦合比引力强度弱的轻或重标量场，这可能是违反弱等效原理的一个来源。我们利用 MICROSCOPE 实验在 Eötvös 参数方面的首批结果，对这种标量场施加了新的限制。对于质量小于 10^{-12}eV 的重标量场（即范围大于几个 10^{5}m），如果标量场与重子数耦合，我们将现有的限制提高了一个数量级，达到 |α|<10^{-11}；如果标量场与重子数和轻子数之差耦合，我们将限制提高到 |α|<10^{-12}。我们还考虑了一个描述通用赝标量与标准物质场耦合的模型，其中有五个参数：对于轻场，我们发现，对于质量小于 10^{-12}eV 的情况，与之前的等效原理测试相比，对赝标量耦合参数的限制提高了一个数量级。
