Redshift drift in a universe with structure II: Light rays propagated through a Newtonian N-body simulation
arXiv:2303.06900 · doi:10.1103/PhysRevD.107.063544
Abstract
The redshift drift is computed along light rays propagating through a simulated universe based on the Newtonian N-body simulation code GADGET-2 combined with a perturbed Friedmann-Lemaitre-Robertson-Walker metric in the Newtonian gauge. It is found that the mean redshift drift is equal to the drift of the mean redshift to the precision of the numerical computations and that this is due to a high degree of cancellation between two dominant components of the redshift drift. This result is contrary to earlier findings based on inhomogeneous cosmological models exhibiting cosmic backreaction. \newline\indent For simplicity, the results neglect contributions from optical drift. Based on a study of the redshift drift in a Lemaitre-Tolman-Bondi model, the optical drift effects are estimated to be at most of order 10\% of the redshift drift signal. In addition, it is found that the redshift drift contribution from peculiar acceleration of the emitter is negligible in the simulation setup. However, it is expected that the contribution from peculiar acceleration of the emitter is suppressed in the setup due to low resolution of structures and it is hence expected that this contribution will be larger for real observations.
12 pages with 8 captioned figures. Accepted for publication in PRD. v2: 2 references added (after publication). No other changes
References in corpus (18)
- Planck evidence for a closed Universe and a possible crisis for cosmology
- Cosmic dynamics in the era of Extremely Large Telescopes
- Time drift of cosmological redshifts as a test of the Copernican principle
- Exploring the Dark Energy Redshift Desert with the Sandage-Loeb Test
- The time evolution of cosmological redshift as a test of dark energy
- Redshift Drift in LTB Void Universes
- Another look at redshift drift and the backreaction conjecture
- Time drift of cosmological redshifts and its variance
- Light propagation in a homogeneous and anisotropic universe
- Searching for signals of inhomogeneity using multiple probes of the cosmic expansion rate H(z)
- LTB solutions in Newtonian gauge: from strong to weak fields
- Redshift drift in axially symmetric quasi-spherical Szekeres models
- The ACCELERATION programme: I. Cosmology with the redshift drift
- Multipole decomposition of redshift drift -- model independent mapping of the expansion history of the Universe
- Redshift drift in a pressure-gradient cosmology
- Peculiar acceleration
- Quantifying effects of inhomogeneities and curvature on gravitational wave standard siren measurements of
- Understanding the Dyer-Roeder approximation as a consequence of local cancellations of projected shear and expansion rate fluctuations