论文标题
带有结构i的宇宙中的红移漂移：lemaitre-tolman-bondi结构有任意的光的进入角度
Redshift drift in a universe with structure I: Lemaitre-Tolman-Bondi structures with arbitrary angle of entry of light
论文作者
论文摘要
我们考虑形式主义中与天体物理源相关的红移漂移和位置漂移，适合在任意时空的几何形状中描述发射器和观察者，同时识别出到达观察者世界线的给定无效的发射器。然后，我们将这种情况限制为Lemaitre-Tolman-Bondi（LTB）几何结构的特殊情况，并求解具有任意影响参数的结构，即具有任意进入LTB结构的角度的光线。通过共同源发出的红移漂移信号，并被共同观察者观察到沿连接光射线集成的RICCI曲率和电动Weyl曲率贡献所主导的。该属性大大简化了红移漂移信号的计算，我们希望该属性扩展到包括瑞士奶酪型号在内的更复杂的模型。在考虑具有随机冲击参数的几个零射线时，平均红移漂移信号被单个RICCI聚焦项近似。这表明，宇宙学红移漂移的测量可以用作对逼真的宇宙中强能量条件的直接探测，其中光子通过许多连续的结构。
We consider the redshift drift and position drift associated with astrophysical sources in a formalism that is suitable for describing emitters and observers of light in an arbitrary spacetime geometry, while identifying emitters of a given null-geodesic bundle that arrives at the observer worldline. We then restrict the situation to the special case of a Lemaitre-Tolman-Bondi (LTB) geometrical structure, and solve for light rays propagating through the structure with arbitrary impact parameters, i.e., with arbitrary angles of entry into the LTB structure. The redshift drift signal emitted by comoving sources and viewed by a comoving observer turns out to be dominated by Ricci curvature and electric Weyl curvature contributions as integrated along the connecting light ray. This property simplifies the computations of the redshift drift signal tremendously, and we expect that the property extends to more complicated models including Swiss-cheese models. When considering several null rays with random impact parameters, the mean redshift drift signal is well approximated by a single Ricci focusing term. This suggests that the measurement of cosmological redshift drift can be used as a direct probe of the strong energy condition in a realistic universe where photons pass through many successive structures.
