Redshift remapping and cosmic acceleration in darkmatterdominated cosmological models
Abstract
The standard relation between the cosmological redshift and cosmic scale factor underlies cosmological inference from virtually all kinds of cosmological observations, leading to the emergence of the LambdaCDM cosmological model. This relation is not a fundamental theory and thus observational determination of this function (redshift remapping) should be regarded as an insightful alternative to holding its standard form in analyses of cosmological data. We present nonparametric reconstructions of redshift remapping in darkmatterdominated models and constraints on cosmological parameters from a joint analysis of all primary cosmological probes including the local measurement of the Hubble constant, Type Ia supernovae, baryonic acoustic oscillations (BAO), Planck observations of the cosmic microwave background (CMB) radiation (temperature power spectrum) and cosmic chronometers. The reconstructed redshift remapping points to an additional boost of redshift operating in late epoch of cosmic evolution, but affecting both lowredshift observations and the CMB. The model then predicts a significant difference between the actual Hubble constant, h=0.48±0.02, and its local determination, h _{obs}=0.73±0.02. The ratio of these two values coincides closely with the maximum expansion rate inside voids formed in the corresponding open cosmological model with Ω _{m}=0.87±0.03, whereas the actual value of the Hubble constant implies the age of themore »
 Authors:
 Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology; Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
 Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology; Autonomous Univ. of Madrid (Spain). Inst. of Theoretical Physics; Campus of International Excellence, Madrid (Spain); Astrophyical Inst. of Andalucia, Grenada (Spain)
 Publication Date:
 Research Org.:
 SLAC National Accelerator Lab., Menlo Park, CA (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1407711
 Alternate Identifier(s):
 OSTI ID: 1418324
 Grant/Contract Number:
 AYA201460641C21P; AC0276SF00515
 Resource Type:
 Journal Article: Accepted Manuscript
 Journal Name:
 Monthly Notices of the Royal Astronomical Society
 Additional Journal Information:
 Journal Volume: 470; Journal Issue: 4; Journal ID: ISSN 00358711
 Publisher:
 Royal Astronomical Society
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTRONOMY AND ASTROPHYSICS; cosmology: observations; distance scale; cosmological parameters; methods: statistical
Citation Formats
Wojtak, Radosław, and Prada, Francisco. Redshift remapping and cosmic acceleration in darkmatterdominated cosmological models. United States: N. p., 2017.
Web. doi:10.1093/mnras/stx1550.
Wojtak, Radosław, & Prada, Francisco. Redshift remapping and cosmic acceleration in darkmatterdominated cosmological models. United States. doi:10.1093/mnras/stx1550.
Wojtak, Radosław, and Prada, Francisco. 2017.
"Redshift remapping and cosmic acceleration in darkmatterdominated cosmological models". United States.
doi:10.1093/mnras/stx1550.
@article{osti_1407711,
title = {Redshift remapping and cosmic acceleration in darkmatterdominated cosmological models},
author = {Wojtak, Radosław and Prada, Francisco},
abstractNote = {The standard relation between the cosmological redshift and cosmic scale factor underlies cosmological inference from virtually all kinds of cosmological observations, leading to the emergence of the LambdaCDM cosmological model. This relation is not a fundamental theory and thus observational determination of this function (redshift remapping) should be regarded as an insightful alternative to holding its standard form in analyses of cosmological data. We present nonparametric reconstructions of redshift remapping in darkmatterdominated models and constraints on cosmological parameters from a joint analysis of all primary cosmological probes including the local measurement of the Hubble constant, Type Ia supernovae, baryonic acoustic oscillations (BAO), Planck observations of the cosmic microwave background (CMB) radiation (temperature power spectrum) and cosmic chronometers. The reconstructed redshift remapping points to an additional boost of redshift operating in late epoch of cosmic evolution, but affecting both lowredshift observations and the CMB. The model then predicts a significant difference between the actual Hubble constant, h=0.48±0.02, and its local determination, hobs=0.73±0.02. The ratio of these two values coincides closely with the maximum expansion rate inside voids formed in the corresponding open cosmological model with Ωm=0.87±0.03, whereas the actual value of the Hubble constant implies the age of the Universe that is compatible with the Planck LambdaCDM cosmology. The new darkmatterdominated model with redshift remapping provides excellent fits to all data and eliminates recently reported tensions between the Planck LambdaCDM cosmology, the local determination of the Hubble constant and the BAO measurements from the Ly α forest of highredshift quasars.},
doi = {10.1093/mnras/stx1550},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 470,
place = {United States},
year = 2017,
month = 6
}
Web of Science

The standard relation between the cosmological redshift and cosmic scale factor underlies cosmological inference from virtually all kinds of cosmological observations, leading to the emergence of the LambdaCDM cosmological model. This relation is not a fundamental theory and thus observational determination of this function (redshift remapping) should be regarded as an insightful alternative to holding its standard form in analyses of cosmological data. Here we present nonparametric reconstructions of redshift remapping in darkmatterdominated models and constraints on cosmological parameters from a joint analysis of all primary cosmological probes including the local measurement of the Hubble constant, Type Ia supernovae, baryonicmore »Cited by 2

Testing homogeneity with galaxy number counts: lightcone metric and general lowredshift expansion for a central observer in a matter dominated isotropic universe without cosmological constant
As an alternative to dark energy it has been suggested that we may be at the center of an inhomogeneous isotropic universe described by a LemaitreTolmanBondi (LTB) solution of Einstein's field equations. In order to test this hypothesis we calculate the general analytical formula to fifth order for the redshift spherical shell mass. Using the same analytical method we write the metric in the lightcone by introducing a gauge invariant quantity G(z) which together with the luminosity distance D{sub L}(z) completely determine the lightcone geometry of a LTB model. 
Constraints on cold dark matterdominated universes from cosmic background radiation anisotropies
The temperature fluctuations in the cosmic background radiation are numerically investigated for universes dominated by cold dark matter. It is shown that the limit on temperature fluctuations measured by Readhead et al. (1989) at 7.15 arcmin yields the strongest constraint on such universes. It is concluded that a lowdensity universe with Omega(0) less than about 0.3 is viable only when the Hubble constant takes a value of 80100 km/s/Mpc. It is a matter of great significance whether such a value of the Hubble constant is consistent with the age inferred from globular clusters and nucleochronology, which is greater than aboutmore » 
Cosmic background radiation anisotropies in universes dominated by nonbaryonic dark matter
We present detailed calculations of the temperature fluctuations in the cosmic background radiation for universe dominated by massive collisionless relics of the big bang. We assume an initially adiabatic constant curvature perturbation spectrum. In models with cold dark matter, the simplest hypothesisthat galaxies follow the mass distributionleads to smallscale anisotropies which exceed current observational limits if ..cap omega..<0.2 h/sup 4/3/. Since low values of ..cap omega.. are indicated by dynamical studies of galaxy clustering, cold particle models in which light traces mass are probably incorrect. Reheating of the pregalactic medium is unlikely to modify this conclusion. In cold particle ormore »