论文标题
超级反应矢量星
Ultracompact vector stars
论文作者
论文摘要
我们在分析中研究了一个新的无水平的紧凑型物体在矢量探测的重力理论中，称为“超级反应矢量恒星”。它们是由矢量冷凝物来源的，该冷凝物由与重力的非最小耦合引起。由于它们的内部各向异性压力，它们可以像黑洞一样紧凑。在球形对称的情况下，它们的内饰类似于等温球，其奇异性可以通过调谐可用的集成常数来解决。恒星内部平滑地匹配与外部Schwarzschild几何形状，而无需在恒星表面进行额外的能量张量。我们分析允许稳定的圆形轨道的恒星内部中的大地测量行为，以及在两种方面都穿越恒星表面的轨迹。我们分析研究了矢量场和几何形状的固定变形，它们破坏了球形对称性，并且其特征取决于我们考虑的矢量调节理论。我们介绍并确定矢量磁敏感性作为恒星特性的探针，并分析了恒星的旋转速率如何受矢量电荷的影响。
We analytically investigate a new family of horizonless compact objects in vector-tensor theories of gravity, called ultracompact vector stars. They are sourced by a vector condensate, induced by a non-minimal coupling with gravity. They can be as compact as black holes, thanks to their internal anisotropic stress. In the spherically symmetric case their interior resembles an isothermal sphere, with a singularity that can be resolved by tuning the available integration constants. The star interior smoothly matches to an exterior Schwarzschild geometry, with no need of extra energy-momentum tensor at the star surface. We analyse the behaviour of geodesics within the star interior, where stable circular orbits are allowed, as well as trajectories crossing in both ways the star surface. We analytically study stationary deformations of the vector field and of the geometry, which break spherical symmetry, and whose features depend on the vector-tensor theory we consider. We introduce and determine the vector magnetic susceptibility as a probe of the star properties, and we analyze how the rate of rotation of the star is affected by the vector charges.
