论文标题
动力学筛选与物质耦合的鲁棒性
Robustness of kinetic screening against matter coupling
论文作者
论文摘要
我们研究了标量调整的重力理论中的中子星溶液，并在动作和物质偶联中使用一阶导数自相互作用。我们评估了这些理论中存在的动力学筛选机制的鲁棒性，以抗物质的一般保形耦合。后者包括导致经典的damour-esposito-farèse标量，并取决于标量场的动力学术语。我们发现动力学筛选始终胜过标量，而与物质的动力学耦合可以增强恒星内部恒星内部梯度的抑制，而无需依赖非线性策略。微调动作中的动力学耦合，使动作中的衍生性自相互作用使人们可以部分取消后者，从而导致恒星内部的动力学筛选减弱。这种效果代表了在物质源内打破筛选机制的一种新型方法，并提供了可能通过天体物理观测来测试的新签名。
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.
