AI 中文总结
研究暗能量EFT中瓦因施泰因机制在非球对称下的作用，通过假设非球对称偏差小，计算非球源引力势多极矩，发现一般情况下第五种力多极矩未被屏蔽，特殊情况也不足以屏蔽第五种力。
AI 中文摘要
有人认为简并高阶标量-张量理论和暗能量有效场论（EFT）具有瓦因施泰因机制，在引力源外部产生屏蔽的第五种力。但此前大多讨论假设了球对称性。本文研究瓦因施泰因机制在非球对称暗能量EFT中是否起作用，尤其关注“超越霍恩德斯基”EFT参数的作用。假设非球对称偏差小，计算给定非球源引力势的多极矩。结果表明，对于“超越霍恩德斯基”EFT参数的一般选择，在单极分量被屏蔽的区域，第五种力的多极矩未被屏蔽，引力势在多极分量中呈现特征性振荡行为。在EFT参数调整使得引力子几乎不衰减为暗能量的特殊情况下，多极矩行为与一般情况定性不同，但此时瓦因施泰因机制也不足以在源周围屏蔽第五种力。
英文摘要
It has been argued that degenerate higher-order scalar-tensor theories and the effective field theory (EFT) of dark energy are endowed with the Vainshtein mechanism, resulting in a screened fifth force in the exterior of a gravitational source. However, spherical symmetry has been assumed in most of the discussions so far. In this paper, we study whether the Vainshtein mechanism operates in the EFT of dark energy beyond spherical symmetry, focusing in particular on the role of the ``beyond Horndeski'' EFT parameters. Assuming that deviations from spherical symmetry are small, we compute multipole moments of the gravitational potential for a given nonspherical source. For a generic choice of the ``beyond Horndeski'' EFT parameters, it is shown that the multipole moments of the fifth force are not screened in the region where the monopole component is screened. Rather, the gravitational potential shows a characteristic oscillatory behavior in its multipole components. In the special case where the EFT parameters are tuned so that graviton decay into dark energy is practically absent, the behavior of the multipole moments is qualitatively different from that in the generic case. However, also in this case, the Vainshtein mechanism is not efficient enough to screen the fifth force around the source.
Comments30 pages, 9 figures
