论文标题
SDSS BOSS DR12 CMASS和LOWZ星系的大规模4点相关函数中平等-ODD模式的测量
Measurement of Parity-Odd Modes in the Large-Scale 4-Point Correlation Function of SDSS BOSS DR12 CMASS and LOWZ Galaxies
论文作者
论文摘要
四面体是最简单的形状，无法以3D旋转到其镜像中。 4点相关函数（4PCF）是对星系四重奏的过量聚类，是随机的四重奏聚集，是对违规平均值敏感的最低阶段统计数据。每个星系定义一个四面体的一个顶点。 4PCF的奇偶校验模式探测四面体与它们的镜像图像之间的不平衡。我们从当前最大的光谱样品，巴里昂振荡光谱调查（boss）dr12 lowz（$ \ bar {z} = 0.32 $）和803,112 lrgs的Boss Dr12 Cmass（$ 7 $ 7的$ 7）中（$} = 0. Z = 0. Z = 0.20067 $} 0. $ 5.在Lowz中，我们发现了$3.1σ$的非零奇偶校验-ODD 4PCF的证据，在CMASS中，我们以$7.1σ$的价格检测出奇偶校验-ODD 4PCF。仅重力演化不会产生这种影响。如果起源于宇宙学，则在LSS中破裂的平均值必须源于通货膨胀的时期。我们已经探索了许多系统误差的来源，发现没有人能产生一个虚假的奇偶校验\ textit {signal}足以解释我们的结果。 \ textit {噪声}的低估也可能导致虚假检测。我们报告的意义假定用于计算协方差的模拟目录充分捕获了真实数据的协方差。我们已经进行了许多测试来探索这个问题。奇数4PCF在3D LSS的通货膨胀时期开辟了一条新的途径，以探测新的力量。及时及时及时探索即将到来的光谱样品，例如Desi和Euclid。
A tetrahedron is the simplest shape that cannot be rotated into its mirror image in 3D. The 4-Point Correlation Function (4PCF), which quantifies excess clustering of quartets of galaxies over random, is the lowest-order statistic sensitive to parity violation. Each galaxy defines one vertex of the tetrahedron. Parity-odd modes of the 4PCF probe an imbalance between tetrahedra and their mirror images. We measure these modes from the largest currently available spectroscopic samples, the 280,067 Luminous Red Galaxies (LRGs) of the Baryon Oscillation Spectroscopic Survey (BOSS) DR12 LOWZ ($\bar{z} = 0.32$) and the 803,112 LRGS of BOSS DR12 CMASS ($\bar{z} = 0.57$). In LOWZ we find $3.1σ$ evidence for a non-zero parity-odd 4PCF, and in CMASS we detect a parity-odd 4PCF at $7.1σ$. Gravitational evolution alone does not produce this effect; parity-breaking in LSS, if cosmological in origin, must stem from the epoch of inflation. We have explored many sources of systematic error and found none that can produce a spurious parity-odd \textit{signal} sufficient to explain our result. Underestimation of the \textit{noise} could also lead to a spurious detection. Our reported significances presume that the mock catalogs used to calculate the covariance sufficiently capture the covariance of the true data. We have performed numerous tests to explore this issue. The odd-parity 4PCF opens a new avenue for probing new forces during the epoch of inflation with 3D LSS; such exploration is timely given large upcoming spectroscopic samples such as DESI and Euclid.
