动力学筛选对物质耦合的鲁棒性
Robustness of kinetic screening against matter coupling
摘要：
在标量-张量引力理论中研究了在作用量和物质耦合中具有一阶导数自相互作用的中子星解。我们评估的鲁棒性的动力学屏蔽机制，目前在这些理论对一般的共形耦合的问题。后者包括导致经典Damour-Esposito-Farèse标量化的标量化，以及依赖于标量场动力学项的标量化。我们发现，动力学屏蔽总是战胜标量化，并与物质的动力学耦合增强抑制标量梯度内的恒星甚至更多，而不依赖于非线性制度。微调的动力学耦合与衍生的自相互作用的行动允许一个部分取消后者，导致在恒星内部的动力屏蔽减弱。这种效应代表了一种打破物质源内部屏蔽机制的新方法，并提供了可能通过天体物理观测进行测试的新特征。
英文摘要：
We investigate neutron star solutions in scalar-tensor theories of gravity with first-order derivative self-interactions in the action and in the matter coupling. We assess the robustness of the kinetic screening mechanism present in these theories against general conformal couplings to matter. The latter include ones leading to the classical Damour-Esposito-Farèse scalarization, as well as ones depending on the kinetic term of the scalar field. We find that kinetic screening always prevails over scalarization, and that kinetic couplings with matter enhance the suppression of scalar gradients inside the star even more, without relying on the non-linear regime. Fine tuning the kinetic coupling with the derivative self-interactions in the action allows one to partially cancel the latter, resulting in a weakening of kinetic screening inside the star. This effect represents a novel way to break screening mechanisms inside matter sources, and provides new signatures that might be testable with astrophysical observations.
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