تقرير
Is the Observable Universe Consistent with the Cosmological Principle?
| العنوان: | Is the Observable Universe Consistent with the Cosmological Principle? |
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| المؤلفون: | Aluri, Pavan Kumar, Cea, Paolo, Chingangbam, Pravabati, Chu, Ming-Chung, Clowes, Roger G., Hutsemékers, Damien, Kochappan, Joby P., Lopez, Alexia M., Liu, Lang, Martens, Niels C. M., Martins, C. J. A. P., Migkas, Konstantinos, Colgáin, Eoin Ó, Pranav, Pratyush, Shamir, Lior, Singal, Ashok K., Sheikh-Jabbari, M. M., Wagner, Jenny, Wang, Shao-Jiang, Wiltshire, David L., Yeung, Shek, Yin, Lu, Zhao, Wen |
| المصدر: | Classical and Quantum Gravity, Vol. 40, Issue No. 9, Page No. 094001 (2023) |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory Physics (Other) |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology, High Energy Physics - Theory, Physics - History and Philosophy of Physics |
| الوصف: | The Cosmological Principle (CP) -- the notion that the Universe is spatially isotropic and homogeneous on large scales -- underlies a century of progress in cosmology. It is conventionally formulated through the Friedmann-Lema\^itre-Robertson-Walker (FLRW) cosmologies as the spacetime metric, and culminates in the successful and highly predictive $\Lambda$-Cold-Dark-Matter ($\Lambda$CDM) model. Yet, tensions have emerged within the $\Lambda$CDM model, most notably a statistically significant discrepancy in the value of the Hubble constant, $H_0$. Since the notion of cosmic expansion determined by a single parameter is intimately tied to the CP, implications of the $H_0$ tension may extend beyond $\Lambda$CDM to the CP itself. This review surveys current observational hints for deviations from the expectations of the CP, highlighting synergies and disagreements that warrant further study. Setting aside the debate about individual large structures, potential deviations from the CP include variations of cosmological parameters on the sky, discrepancies in the cosmic dipoles, and mysterious alignments in quasar polarizations and galaxy spins. While it is possible that a host of observational systematics are impacting results, it is equally plausible that precision cosmology may have outgrown the FLRW paradigm, an extremely pragmatic but non-fundamental symmetry assumption. Comment: extended contents and references, 73 pages (excluding references), 30 figures, version accepted for publication in Class. Quant. Grav. "Focus issue on the Hubble constant tension" |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/1361-6382/acbefc |
| URL الوصول: | http://arxiv.org/abs/2207.05765 |
| رقم الأكسشن: | edsarx.2207.05765 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/1361-6382/acbefc |
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