J/A+A/622/A83 Sizes of infinity regions (Saulder+, 2019)
Hubble flow variations as a test for inhomogeneous cosmology.
Saulder C., Mieske S., van Kampen E., Zeilinger W.W.
<Astron. Astrophys. 622, A83 (2019)>
=2019A&A...622A..83S 2019A&A...622A..83S (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Surveys ; Morphology
Keywords: cosmology: observations - dark energy -
large-scale structure of Universe
Abstract:
Backreactions from large-scale inhomogeneities may provide an elegant
explanation for the observed accelerated expansion of the universe
without the need to introduce dark energy.
We propose a cosmological test for a specific model of inhomogeneous
cosmology, called timescape cosmology. Using large-scale galaxy
surveys such as SDSS and 2MRS, we test the variation of expansion
expected in the Λ-CDM model versus a more generic differential
expansion using our own calibrations of bounds suggested by timescape
cosmology.
Our test measures the systematic variations of the Hubble flow towards
distant galaxies groups as a function of the matter distribution in
the lines of sight to those galaxy groups. We compare the observed
systematic variation of the Hubble flow to mock catalogues from the
Millennium Simulation in the case of the Λ-CDM model, and a
deformed version of the same simulation that exhibits more pronounced
differential expansion.
We perform a series of statistical tests, ranging from linear
regressions to Kolmogorov-Smirnov tests, on the obtained data. They
consistently yield results preferring Λ-CDM cosmology over our
approximated model of timescape cosmology.
Our analysis of observational data shows no evidence that the
variation of expansion differs from that of the standard Λ-CDM
model.
Description:
Masses, sizes, and positions of finite infinity regions (according to
an approximated timescape cosmology) derived from SDSS and 2MRS data.
We provide two catalogues, one in the reference system of the CMB and
one in the reference system of the Local Group.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 93 157580 Finite infinity regions in the Local Group rest
frame
tablea2.dat 93 158607 Finite infinity regions in the CMB rest frame
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea1.dat tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.5 deg RAdeg [] Right ascension (J2000)
12- 20 F9.5 deg DEdeg Declination (J2000)
22- 30 F9.5 Mpc Dcm Co-moving distance
32- 39 F8.3 Mpc Cx Cartesian co-moving coordinate x
41- 48 F8.3 Mpc Cy Cartesian co-moving coordinate x
50- 56 F7.3 Mpc Cz Cartesian co-moving coordinate x
58- 66 F9.6 [Msun] logMfi Logarithm of the mass within the finite
infinity region
68- 75 F8.6 [Msun] e_logMfi Logarithm of the uncertainty of the mass
within the finite infinity region
77- 84 F8.5 Mpc Rfi Radius of the finite infinity region
86- 93 F8.5 Mpc e_Rfi Uncertainty of the radius of the finite
infinity region
--------------------------------------------------------------------------------
Acknowledgements:
Christoph Saulder, csaulder(at)kias.re.kr
(End) Christoph Saulder [KIAS, South Korea], Patricia Vannier [CDS] 07-Dec-2018