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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
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2023
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| Accès en ligne: | https://arxiv.org/abs/2312.16147 |
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| _version_ | 1866916962143043584 |
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| author | Hogan, Craig Kwon, Ohkyung Meyer, Stephan S. Selub, Nathaniel Wehlen, Frederick |
| author_facet | Hogan, Craig Kwon, Ohkyung Meyer, Stephan S. Selub, Nathaniel Wehlen, Frederick |
| contents | Anisotropy of space-time is measured on the scale of the cosmic horizon, using the angular correlation function $C(Θ)$ of cosmic microwave background (CMB) temperature at large angular separation $Θ$. Even-parity correlation $C_{\rm even}(Θ)$ is introduced to obtain a direct, precise measure of horizon-scale curvature anisotropy independent of the unknown dipole, with uncertainty dominated by models of Galactic emission. In maps from WMAP and Planck, $C_{\rm even}(Θ)$ at $Θ\simeq 90^\circ\pm 15^\circ$ is found to be much closer to zero than in previously documented measurements. Variation from zero as small as that in the {\sl Planck} maps is estimated to occur by chance in a fraction $\simeq 10^{-4.3}$ to $\simeq 10^{-2.8}$ of standard realizations. Measurements are found to be consistent with zero correlation in a range of angles expected from quantum fluctuations during inflation whose spacelike coherence is bounded by inflationary horizons around every location at every epoch. This scale-invariant symmetry of cosmological initial conditions is incompatible with the standard quantum theory of initial conditions, but is broadly consistent with other cosmological measurements, and is subject to further tests. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_16147 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Dipole-independent measurements of nearly-zero CMB correlation: a possible symmetry of primordial causal quantum coherence Hogan, Craig Kwon, Ohkyung Meyer, Stephan S. Selub, Nathaniel Wehlen, Frederick Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology Anisotropy of space-time is measured on the scale of the cosmic horizon, using the angular correlation function $C(Θ)$ of cosmic microwave background (CMB) temperature at large angular separation $Θ$. Even-parity correlation $C_{\rm even}(Θ)$ is introduced to obtain a direct, precise measure of horizon-scale curvature anisotropy independent of the unknown dipole, with uncertainty dominated by models of Galactic emission. In maps from WMAP and Planck, $C_{\rm even}(Θ)$ at $Θ\simeq 90^\circ\pm 15^\circ$ is found to be much closer to zero than in previously documented measurements. Variation from zero as small as that in the {\sl Planck} maps is estimated to occur by chance in a fraction $\simeq 10^{-4.3}$ to $\simeq 10^{-2.8}$ of standard realizations. Measurements are found to be consistent with zero correlation in a range of angles expected from quantum fluctuations during inflation whose spacelike coherence is bounded by inflationary horizons around every location at every epoch. This scale-invariant symmetry of cosmological initial conditions is incompatible with the standard quantum theory of initial conditions, but is broadly consistent with other cosmological measurements, and is subject to further tests. |
| title | Dipole-independent measurements of nearly-zero CMB correlation: a possible symmetry of primordial causal quantum coherence |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2312.16147 |