Another look at redshift drift and the backreaction conjecture
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2019/10/036
Abstract: Earlier studies have conjectured that redshift drift is described by spatially averaged quantities and thus becomes positive if the average expansion of the Universe accelerates. This conclusion is reevaluated here by considering exact light propagation… read more here.
Keywords: drift; expansion; model; redshift drift ... See more keywords
Redshift drift in uniformly accelerated reference frame
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DOI: 10.1088/1674-1137/44/5/055101
Abstract: We construct an alternative uniformly accelerated reference frame based on 3+1 formalism in adapted coordinate. It is distinguished with Rindler coordinate that there is time-dependent redshift drift between co-moving observers. The experimentally falsifiable distinguishment might… read more here.
Keywords: frame; reference frame; uniformly accelerated; redshift drift ... See more keywords
Spectroscopy of QUBRICS quasar candidates: 1672 new redshifts and a Golden Sample for the Sandage Test of the Redshift Drift
Sign Up to like & getrecommendations! Published in 2023 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stad1007
Abstract: The QUBRICS (QUasars as BRIght beacons for Cosmology in the Southern hemisphere) survey aims at constructing a sample of the brightest quasars with $z \lower.5ex\hbox{$\; \buildrel> \over \sim \;$}2.5$, observable with facilities in the Southern… read more here.
Keywords: quasar candidates; 1672 new; sandage test; spectroscopy ... See more keywords
Redshift drift in radially inhomogeneous Lemaître-Tolman-Bondi spacetimes
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DOI: 10.1103/physrevd.104.123531
Abstract: We provide a formula for estimating the redshift and its secular change (redshift drift) in Lemaı̂tre-TolmanBondi (LTB) spherically symmetric universes. We compute the scaling of the redshift drift for LTB models that predict Hubble diagrams… read more here.
Keywords: drift; redshift drift; lema tre;
Cosmic backreaction and the mean redshift drift from symbolic regression
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DOI: 10.1103/physrevd.107.103522
Abstract: The possibility of obtaining symbolic expressions for cosmic backreaction is explored through a case study of so-called 2-region models. By using the publicly available symbolic regression algorithm AI Feynman, it is shown that the kinematical… read more here.
Keywords: backreaction; region; redshift; redshift drift ... See more keywords
Machine Learning Cosmic Backreaction and Its Effects on Observations.
Sign Up to like & getrecommendations! Published in 2023 at "Physical review letters"
DOI: 10.1103/physrevlett.130.201003
Abstract: Symbolic expressions for cosmic backreaction and mean redshift drift in a range of two-region models in terms of average quantities are presented. The demonstration that these expressions can be obtained constitutes the opening of a… read more here.
Keywords: learning cosmic; backreaction; machine learning; cosmic backreaction ... See more keywords