论文标题
测试Brans-Dicke重力通过标量重力波记忆进行筛选
Testing Brans-Dicke Gravity with Screening by Scalar Gravitational Wave Memory
论文作者
论文摘要
Brans-Dicke的重力理论是通过在标量场和重力之间引入非最小耦合来扩展一般相对性的最古老的思想之一。太阳系测试对该理论施加了严格的限制。为了逃避这些约束，已经提出了各种筛选机制。这些筛选机制使标量场在低密度环境中的重力与重力一样强，同时在太阳系中抑制它。 Vainshtein机制在各种修饰的重力模型中发现，例如大型重力，Braneworld模型和标量张量理论，可在大型物体的附近有效地抑制标量场。这使得很难从重力波观测中测试这些理论。我们指出，最近发现的标量重力波记忆效应是由于恒星倒塌到后孔的永久变化而引起的，这在Brans-Dicke的重力理论中具有Vainshtein机制，可以显着增强。这提供了通过三个或多个重力波检测器网络检测标量重力波的可能性。
The Brans-Dicke theory of gravity is one of the oldest ideas to extend general relativity by introducing a non-minimal coupling between the scalar field and gravity. The Solar System tests put tight constraints on the theory. In order to evade these constraints, various screening mechanisms have been proposed. These screening mechanisms allow the scalar field to couple to matter as strongly as gravity in low density environments while suppressing it in the Solar System. The Vainshtein mechanism, which is found in various modified gravity models such as massive gravity, braneworld models and scalar tensor theories, suppresses the scalar field efficiently in the vicinity of a massive object. This makes it difficult to test these theories from gravitational wave observations. We point out that the recently found scalar gravitational wave memory effect, which is caused by a permanent change in spacetime geometry due to the collapse of a star to a back hole can be significantly enhanced in the Brans-Dicke theory of gravity with the Vainshtein mechanism. This provides a possibility to detect scalar gravitational waves by a network of three or more gravitational wave detectors.
