# Redshift remapping and cosmic acceleration in dark-matter-dominated 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 non-parametric reconstructions of redshift remapping in dark-matter-dominated 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 low-redshift 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:
- AYA2014-60641-C2-1-P; AC02-76SF00515

- 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 0035-8711

- 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 dark-matter-dominated cosmological models*. United States: N. p., 2017.
Web. doi:10.1093/mnras/stx1550.

```
Wojtak, Radosław, & Prada, Francisco.
```*Redshift remapping and cosmic acceleration in dark-matter-dominated cosmological models*. United States. doi:10.1093/mnras/stx1550.

```
Wojtak, Radosław, and Prada, Francisco. Wed .
"Redshift remapping and cosmic acceleration in dark-matter-dominated cosmological models". United States.
doi:10.1093/mnras/stx1550. https://www.osti.gov/servlets/purl/1407711.
```

```
@article{osti_1407711,
```

title = {Redshift remapping and cosmic acceleration in dark-matter-dominated 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 non-parametric reconstructions of redshift remapping in dark-matter-dominated 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 low-redshift 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 dark-matter-dominated 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 high-redshift quasars.},

doi = {10.1093/mnras/stx1550},

journal = {Monthly Notices of the Royal Astronomical Society},

number = 4,

volume = 470,

place = {United States},

year = {Wed Jun 21 00:00:00 EDT 2017},

month = {Wed Jun 21 00:00:00 EDT 2017}

}

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