Gaia quasar proper motions show a significant quadrupole signal matching an axisymmetric Bianchi I anisotropy model, but the amplitude does not increase with redshift as the model requires and the inferred local shear exceeds expectations.
The WiggleZ Dark Energy Survey: the transition to large-scale cosmic homogeneity
4 Pith papers cite this work. Polarity classification is still indexing.
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abstract
We have made the largest-volume measurement to date of the transition to large-scale homogeneity in the distribution of galaxies. We use the WiggleZ survey, a spectroscopic survey of over 200,000 blue galaxies in a cosmic volume of ~1 (Gpc/h)^3. A new method of defining the 'homogeneity scale' is presented, which is more robust than methods previously used in the literature, and which can be easily compared between different surveys. Due to the large cosmic depth of WiggleZ (up to z=1) we are able to make the first measurement of the transition to homogeneity over a range of cosmic epochs. The mean number of galaxies N(<r) in spheres of comoving radius r is proportional to r^3 within 1%, or equivalently the fractal dimension of the sample is within 1% of D_2=3, at radii larger than 71 \pm 8 Mpc/h at z~0.2, 70 \pm 5 Mpc/h at z~0.4, 81 \pm 5 Mpc/h at z~0.6, and 75 \pm 4 Mpc/h at z~0.8. We demonstrate the robustness of our results against selection function effects, using a LCDM N-body simulation and a suite of inhomogeneous fractal distributions. The results are in excellent agreement with both the LCDM N-body simulation and an analytical LCDM prediction. We can exclude a fractal distribution with fractal dimension below D_2=2.97 on scales from ~80 Mpc/h up to the largest scales probed by our measurement, ~300 Mpc/h, at 99.99% confidence.
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astro-ph.CO 4representative citing papers
Measurements of the angular homogeneity scale from DESI DR1 LRGs are consistent with Lambda-CDM mocks and prior SDSS results in all tested redshift bins.
SDSS blue galaxies yield an angular homogeneity scale of 22.19° ± 1.02° that matches ALFALFA HI sources and ΛCDM expectations at z < 0.06.
citing papers explorer
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Mapping the Universe as a Bianchi I cosmology with Gaia data
Gaia quasar proper motions show a significant quadrupole signal matching an axisymmetric Bianchi I anisotropy model, but the amplitude does not increase with redshift as the model requires and the inferred local shear exceeds expectations.
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Measurements of the Angular Homogeneity Scale from DESI DR1
Measurements of the angular homogeneity scale from DESI DR1 LRGs are consistent with Lambda-CDM mocks and prior SDSS results in all tested redshift bins.
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The angular scale of homogeneity in the Local Universe with the SDSS blue galaxies
SDSS blue galaxies yield an angular homogeneity scale of 22.19° ± 1.02° that matches ALFALFA HI sources and ΛCDM expectations at z < 0.06.
- The velocity coherence scale: a novel probe of cosmic homogeneity and a potential standard ruler