论文标题
部分可观测时空混沌系统的无模型预测
Screening Mechanism and Late-time Cosmology: Role of a Chameleon-Brans-Dicke Scalar Field
论文作者
论文摘要
我们讨论了一种方式，即布兰斯·迪克（Brans-Dicke）理论中的几何标量场可以逃避当地的天文测试并充当后期宇宙加速的驱动力。这需要Brans-Dicke标量以及与普通物质的相互作用的自我互动。该结构中的标量场像变色龙场一样获得密度依赖性有效质量。我们在等价原理，第五力和太阳系测试的背景下讨论了这种设置的可行性。与IA型超新星（JLA），哈勃参数测量值（OHD）和Baryon声学振荡（BAO）的观察数据相比，宇宙学的一致性被裁定。我们扣除的是，天体物理的约束确实有利于约旦框架中温和的标量相互作用的存在。
We discuss a way in which the geometric scalar field in a Brans-Dicke theory can evade local astronomical tests and act as a driver of the late-time cosmic acceleration. This requires a self-interaction of the Brans-Dicke scalar as well as an interaction with ordinary matter. The scalar field in this construct acquires a density-dependent effective mass much like a Chameleon field. We discuss the viability of this setup in the context of the Equivalence Principle, Fifth Force, and Solar System tests. The cosmological consistency is adjudged in comparison with observational data from recalibrated light curves of type Ia supernova (JLA), the Hubble parameter measurements (OHD), and the Baryon Acoustic Oscillation (BAO). We deduct that the astrophysical constraints indeed favor the existence of a mild scalar-matter interaction in the Jordan Frame.
