Phenomenology of the equivalence principle with light scalars
Phenomenology of the equivalence principle with light scalars
复制标题
光标量等效原理的现象学
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
J. Donoghue
中科院分区：
文献类型：
--
作者：
T. Damour;J. Donoghue
具有亚引力耦合强度的轻标量粒子，通常被称为“膨胀”，可以产生对等效原理的违反。然而，为了理解实验灵敏度，必须知道这些标量与原子系统的耦合。我们在此报告一项关于所需耦合的研究。我们给出了一个具有五个独立膨胀参数的一般拉格朗日量，并计算了每个参数下原子系统的“膨胀电荷”。两个组合尤为重要。一个是由于核结合能的变化，其灵敏度随原子序数的变化而变化为a−1/3。另一个是由于电磁。我们比较了现有实验中膨胀参数的极限。
Light scalar particles with couplings of sub-gravitational strength, which can generically be called ‘dilatons’, can produce violations of the equivalence principle. However, in order to understand experimental sensitivities one must know the coupling of these scalars to atomic systems. We report here on a study of the required couplings. We give a general Lagrangian with five independent dilaton parameters and calculate the ‘dilaton charge’ of atomic systems for each of these. Two combinations are particularly important. One is due to the variations in the nuclear binding energy, with a sensitivity scaling with the atomic number as A−1/3. The other is due to electromagnetism. We compare limits on the dilaton parameters from existing experiments.