Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 891, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/ab7934
Keywords
Large-scale structure of the universe; Cosmological parameters from large-scale structure; Baryon acoustic oscillations; Dark energy; Observational cosmology
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Funding
- MEXT/JSPS KAKENHI grants [JP15H05889, JP16H03977]
- Ministry of Science and Technology of Taiwan [MOST 106-2119-M-001-031-MY3]
- Career Development Award, Academia Sinica [AS-CDA-108-M02]
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We show that the spatial correlation of the intrinsic alignments (IAs) of galaxies, measured in galaxy redshift surveys, offers a precision route to improve the geometrical and dynamical constraints on cosmology. The IA has been treated as a contaminant against cosmological probes such as weak gravitational lensing experiments. However, the large-scale correlation of IAs is expected to follow the coherent large-scale matter inhomogeneities. Here, making use of its anisotropic nature, we show that the large-scale IA correlations help to improve the measurements of the geometric distances and growth of structure. In combination with the conventional galaxy clustering statistics, we find that constraints on equation-of-state parameter for dark energy and Hubble parameter can be tighter than those from the clustering statistics alone by a factor of more than 1.5.
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