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- W4377239975 abstract "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 $3.1sigma$ evidence for a non-zero parity-odd 4PCF, and in CMASS we detect a parity-odd 4PCF at $7.1sigma$. 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." @default.
- W4377239975 created "2023-05-23" @default.
- W4377239975 creator A5025206977 @default.
- W4377239975 creator A5052414313 @default.
- W4377239975 creator A5068672295 @default.
- W4377239975 date "2023-05-11" @default.
- W4377239975 modified "2023-10-02" @default.
- W4377239975 title "Measurement of parity-odd modes in the large-scale 4-point correlation function of Sloan Digital Sky Survey Baryon Oscillation Spectroscopic Survey twelfth data release CMASS and LOWZ galaxies" @default.
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