AI 中文总结
本研究提出基于螺旋度的估计量，利用宇宙学模拟验证其可保留原初宇称破缺的手征性，经SDSS DR7数据探测发现本地宇宙宇称破缺无统计显著性证据，为原初宇称破缺提供直接探测途径。
AI 中文摘要
早期宇宙中是否存在宇称对称性破缺仍是宇宙学中未解决的基础问题之一。若存在，它可能在大尺度物质分布中留下固有手征性。本文提出一种基于螺旋度的估计量来测量该手征性，利用具有宇称破缺初始条件的宇宙学模拟表明，该手征性可在非线性结构形成过程中保留；将该估计量应用于SDSS DR7星系巡天目录重建的密度场，发现本地宇宙存在轻微偏离，但无统计显著性的宇称破缺证据。本研究确立了物质分布的固有手征性作为原初宇称破缺的可观测遗迹，可通过当前及未来大尺度结构巡天直接探测。
英文摘要
Whether parity symmetry was violated in the early universe remains one of the fundamental open questions in cosmology. If so, it may leave an intrinsic handedness in the large-scale matter distribution. Here we formulate a helicity-based estimator to measure this handedness. Using cosmological simulations with parity-violating initial conditions, we show that it survives nonlinear structure formation. Applying the estimator to density fields reconstructed from the SDSS DR7 galaxy catalog, we find mild deviations but statistically insignificant evidence for parity violation in the local universe. Our results establish the intrinsic handedness of the matter distribution as an observable relic of primordial parity violation, enabling a direct probe with current and future large-scale structure surveys.
Comments4 pages, 2 figures. Comments welcome
