Pseudo-Evolution of Galaxies in LCDM Cosmology

Abstract

Our knowledge about galaxy evolution comes from transforming observed galaxy properties at different redshifts to co-moving physical scales. This transformation depends on using a cosmological model. Here the effects of unintentional mixing of two different cosmological models on the size evolution of galaxies is studied. As a gedanken experiment, a galaxy of fixed proper size and luminosity is moved across different redshifts. The apparent size of this galaxy is then interpreted with a cosmological model presumed by the observer, which is different compared to the cosmology exhibited by the Universe. In such a case, a spurious size evolution of the galaxy is observed. A galaxy behaving according to the R_h=ct and Neumann's cosmology, when interpreted with the LCDM cosmological model, shows an increase in size by a factor of 1.1 and 1.3 from z=7.5 to z approx. 0, respectively. The apparent size of a galaxy in a static Euclidean cosmology, when interpreted in the LCDM model, shows a factor of 23.8 increase in size between z=7.5 to z approx. 0. This is in close agreement with the observational data with a size increase of a factor of 6.8 between z=3.2 to z approx. 0. Furthermore, using the apparent size data, it is shown that the difference between the derived proper sizes in R_h=ct, Neumann's and LCDM cosmological models are minimal.

arXiv commentaccepted for publication by MNRAS, pdflatex, 9 figures, 8 pages; replacement only includes additional references

References in corpus (39)

• Planck 2015 results. XIII. Cosmological parameters
• The Formation of Galactic Disks
• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• The size distribution of galaxies in the Sloan Digital Sky Survey
• Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
• Strong size evolution of the most massive galaxies since z~2
• The size evolution of galaxies since z~3: combining SDSS, GEMS and FIRES
• The Size Evolution of High Redshift Galaxies
• The dramatic size evolution of elliptical galaxies and the quasar feedback
• Galaxy Size Evolution at High Redshift and Surface Brightness Selection Effects: Constraints from the Hubble Ultra Deep Field
• The dark matter crisis: falsification of the current standard model of cosmology
• The R_h = ct Universe
• Local-Group tests of dark-matter Concordance Cosmology: Towards a new paradigm for structure formation
• Galaxies as simple dynamical systems: observational data disfavor dark matter and stochastic star formation
• Clues from nearby galaxies to a better theory of cosmic evolution
• The Luminosity-Size and Mass-Size Relations of Galaxies out to z~3
• Half-mass radii for ~7,000 galaxies at 1.0 < z < 2.5: most of the evolution in the mass-size relation is due to color gradients
• First Determination of the Distance and Fundamental Properties of an Eclipsing Binary in The Andromeda Galaxy
• A Population of Massive and Evolved Galaxies at z$\ga$5
• Probing the isotropy of cosmic acceleration traced by Type Ia supernovae
• GMASS ultradeep spectroscopy of galaxies at z ~ 2. IV. The variety of dust populations
• The Tolman Surface Brightness Test for the Reality of the Expansion. IV. A Measurement of the Tolman Signal and the Luminosity Evolution of Early-Type Galaxies
• Evolution of Cluster Ellipticals at 0.2 < z < 1.2 from Hubble Space Telescope Imaging
• Deceleration without dark matter
• A Neumann Boundary Term for Gravity
• Galaxies lacking dark matter in the Illustris simulation
• Anisotropy in the all-sky distribution of galaxy morphological types
• Evidence of a truncated spectrum in the angular correlation function of the cosmic microwave background
• 3D Spherical Analysis of Baryon Acoustic Oscillations
• Reconstruction of the HII Galaxy Hubble Diagram using Gaussian Processes
• Determining the equation of state of dark energy from angular size of compact radio sources and X-ray gas mass fraction of galaxy clusters
• Tight Cosmological Constraints from the Angular-Size/Redshift Relation for Ultra-Compact Radio Sources
• UV surface brightness of galaxies from the local Universe to z ~ 5
• Cosmological Tests Using the Angular Size of Galaxy Clusters
• Impact of a locally measured H_0 on the interpretation of cosmic chronometer data
• Observations contradict galaxy size and surface brightness predictions that are based on the expanding universe hypothesis
• Angular size test on the expansion of the Universe
• Ultra-compact radio sources and the isotropy and homogeneity of the Universe
• Missing dust signature in the cosmic microwave background

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• Universe opacity and Type Ia supernova dimming
• A Modified Dynamical Model of Cosmology I. Theory
• The star formation timescale of elliptical galaxies -- Fitting [Mg/Fe] and total metallicity simultaneously
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