Approximations for the divergence of the local large-scale structure velocity field and its implications for Tilted Cosmology
arXiv:2301.11246 · doi:10.1016/j.dark.2023.101385
Abstract
We characterize the peculiar velocity field of the local large-scale structure reconstructed from the survey, by treating it as a fluid, extracting the divergence via different approximations over a range pf averaged scales. This reconstructed field is important for cosmology, since it was used to correct the peculiar redshifts of the last SNIA compilation Pantheon+. The results have intriguing implications for the LLSS fluid dynamics and particularly for the ``Tilted Cosmology'' model, although those results have to be taken carefully as the velocity field could contain significant bias due to the reconstruction procedure. Those possible bias and its influence in our results are discussed. Representative values of the apparent deceleration parameter ($\Tilde{q}$) are computed, in order to compare our results with the theoretical predictions of the tilted-universe scenario. We conclude that better velocity field reconstructions are necessary in order to constrain the parameters implied in LLSS research and alternative cosmologies.
arXiv commentImproved discussion about bias in the velocity reconstruction
References in corpus (22)
- Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
- Measurements of Omega and Lambda from 42 High-Redshift Supernovae
- The Pantheon+ Analysis: The Full Dataset and Light-Curve Release
- Cosmological parameters from the comparison of peculiar velocities with predictions from the 2M++ density field
- Relativistic cosmology and large-scale structure
- Scale-invariance of galaxy clustering
- Evidence for anisotropy of cosmic acceleration
- Evidence for a ~300 Mpc Scale Under-density in the Local Galaxy Distribution
- Is there an early Universe solution to Hubble tension?
- Joint analysis of 6dFGS and SDSS peculiar velocities for the growth rate of cosmic structure and tests of gravity
- A Large-Scale Bulk Flow of Galaxy Clusters
- The KBC void and Hubble tension contradict CDM on a Gpc scale Milgromian dynamics as a possible solution
- The Pantheon+ Analysis: Improving the Redshifts and Peculiar Velocities of Type Ia Supernovae Used in Cosmological Analyses
- Measuring cosmic bulk flows with Type Ia Supernovae from the Nearby Supernova Factory
- The Local Hole revealed by galaxy counts and redshifts
- Observational constraints on the deceleration parameter in a tilted universe
- Inhomogeneities in the universe
- Fractal universe and cosmic acceleration in a Lemaître-Tolman-Bondi scenario
- Peculiar motions, accelerated expansion and the cosmological axis
- Is the expansion of the universe accelerating? All signs still point to yes a local dipole anisotropy cannot explain dark energy
- The deceleration parameter in `tilted' Friedmann universes
- The deceleration parameter in `tilted' universes: generalising the Friedmann background