论当前曲速驱动时空的限制及近期改进的可能性
On restrictions of current warp drive spacetimes and immediate possibilities of improvement
AI总结：
针对当前曲速驱动时空方案仅基础运用广义相对论、受多重强限制且被认为不具物理性的问题，研究提出空间运动的通用协变描述方案，梳理现有文献的主要限制，指出缺失的关键物理要素。
摘要：
审视当前所谓“曲速驱动时空”的相关方案，它们似乎仅在基础层面运用广义相对论。这类方案受到诸多强限制，主要包括时空叶层的流正交性、空间里奇张量为零、维度约化且依赖坐标的速度场等。本文简要概述了我们提出的广义相对论框架下空间运动的通用协变描述方案，随后讨论了当前绝大多数文献中采用的限制条件。当前曲速驱动模型被认为不具物理性或许并不意外；它们缺失了诸多关键要素，比如协变非零的空间速度、加速度、涡度，以及弯曲空间和曲速机制。
英文摘要：
Looking at current proposals of so-called `warp drive spacetimes', they appear to employ General Relativity only at an elementary level. A number of strong restrictions are imposed such as flow-orthogonality of the spacetime foliation, vanishing spatial Ricci tensor, dimensionally reduced and coordinate-dependent velocity fields, to mention the main restrictions. We here provide a brief summary of our proposal of a general and covariant description of spatial motions within General Relativity, then discuss the restrictions that are employed in the majority of the current literature. That current warp drive models are discussed to be unphysical may not be surprising; they lack important ingredients such as covariantly non-vanishing spatial velocity, acceleration, vorticity, together with curved space, and a warp mechanism.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
