Impact of the local void on the cosmological parameters

Yu, Bo

doi:10.1088/1475-7516/2013/03/013

Title: Impact of the local void on the cosmological parameters

Full Record
Other Related Research

Abstract

In this paper, I discuss the effects of a local void on the cosmological parameters. It is found that, if the supernova distance is absolutely calibrated, then the bias of all the cosmological parameters is always important, while if the supernova distance is relatively calibrated, the largest effects will appear in the dark energy equation of state. For a local void of size ∼ 100 Mpc, the bias effects mainly manifest in the low redshift range. Therefore, the piecewise dark energy equation of state, especially the one in the range of lowest redshift, will be more strongly affected than the constant equation of state. In order to reduce this bias in constraining the cosmological parameters, one could require the distance of all the adopted supernovas be greater than 1.2 ∼ 1.5 times of the radius of the local void. In this case, the residual bias can be safely ignored.

Authors:

Yu, Bo ^[1]

Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)

Publication Date:: Fri Mar 01 00:00:00 EST 2013

OSTI Identifier:: 22282951

Resource Type:: Journal Article

Journal Name:: Journal of Cosmology and Astroparticle Physics

Additional Journal Information:: Journal Volume: 2013; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGICAL CONSTANT; COSMOLOGY; DISTANCE; EQUATIONS OF STATE; NONLUMINOUS MATTER; RED SHIFT; SUPERNOVAE

Citation Formats


                    Yu, Bo. Impact of the local void on the cosmological parameters.  United States: N. p., 2013. 
        Web.  doi:10.1088/1475-7516/2013/03/013.

Copy to clipboard


                    Yu, Bo. Impact of the local void on the cosmological parameters.  United States.  https://doi.org/10.1088/1475-7516/2013/03/013

Copy to clipboard


                    Yu, Bo. 2013.  
        "Impact of the local void on the cosmological parameters".  United States.  https://doi.org/10.1088/1475-7516/2013/03/013.

Copy to clipboard


                    
@article{osti_22282951,

  title        = {Impact of the local void on the cosmological parameters},

  author       = {Yu, Bo},

  abstractNote = {In this paper, I discuss the effects of a local void on the cosmological parameters. It is found that, if the supernova distance is absolutely calibrated, then the bias of all the cosmological parameters is always important, while if the supernova distance is relatively calibrated, the largest effects will appear in the dark energy equation of state. For a local void of size ∼ 100 Mpc, the bias effects mainly manifest in the low redshift range. Therefore, the piecewise dark energy equation of state, especially the one in the range of lowest redshift, will be more strongly affected than the constant equation of state. In order to reduce this bias in constraining the cosmological parameters, one could require the distance of all the adopted supernovas be greater than 1.2 ∼ 1.5 times of the radius of the local void. In this case, the residual bias can be safely ignored.},

  doi          = {10.1088/1475-7516/2013/03/013},

  url          = {https://www.osti.gov/biblio/22282951},
  journal      = {Journal of Cosmology and Astroparticle Physics},

  issn         = {1475-7516},

  number       = 03,

  volume       = 2013,

  place        = {United States},

  year         = {Fri Mar 01 00:00:00 EST 2013},

  month        = {Fri Mar 01 00:00:00 EST 2013}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1088/1475-7516/2013/03/013

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Planck 2013 results. XVI. Cosmological parameters

Journal Article Ade, P.; Aghanim, N.; Armitage-Caplan, C.; ... - Astronomy and Astrophysics

This paper presents the first cosmological results based on Planck measurements of the cosmic microwave background (CMB) temperature and lensing-potential power spectra. We find that the Planck spectra at high multipoles (ℓ ≳ 40) are extremely well described by the standard spatially-flat six-parameter ΛCDM cosmology with a power-law spectrum of adiabatic scalar perturbations. Within the context of this cosmology, the Planck data determine the cosmological parameters to high precision: the angular size of the sound horizon at recombination, the physical densities of baryons and cold dark matter, and the scalar spectral index are estimated to be θ_∗ = (1.04147 ±more »« less
Cited by 7703
https://doi.org/10.1051/0004-6361/201321591

Full Text Available
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample

Journal Article Alam, Shadab; Ata, Metin; Bailey, Stephen; ... - Monthly Notices of the Royal Astronomical Society

We present cosmological results from the final galaxy clustering data set of the Baryon Oscillation Spectroscopic Survey, part of the Sloan Digital Sky Survey III. Our combined galaxy sample comprises 1.2 million massive galaxies over an effective area of 9329 deg2 and volume of 18.7 Gpc3, divided into three partially overlapping redshift slices centred at effective redshifts 0.38, 0.51 and 0.61. We measure the angular diameter distance DM and Hubble parameter H from the baryon acoustic oscillation (BAO) method, in combination with a cosmic microwave background prior on the sound horizon scale, after applying reconstruction to reduce non-linear effects onmore »« less
Cited by 744
https://doi.org/10.1093/mnras/stx721

Full Text Available
Local gravitational redshifts can bias cosmological measurements

Journal Article Wojtak, Radosław; Davis, Tamara; Wiis, Jophiel - Journal of Cosmology and Astroparticle Physics

Measurements of cosmological parameters via the distance-redshift relation usually rely on models that assume a homogenous universe. It is commonly presumed that the large-scale structure evident in our Universe has a negligible impact on the measurement if distances probed in observations are sufficiently large (compared to the scale of inhomogeneities) and are averaged over different directions on the sky. This presumption does not hold when considering the effect of the gravitational redshift caused by our local gravitational potential, which alters light coming from all distances and directions in the same way. Despite its small magnitude, this local gravitational redshift givesmore »« less
https://doi.org/10.1088/1475-7516/2015/07/025
First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: Constraints on Cosmological Parameters

Journal Article Abbott, T.; Allam, S.; Andersen, P.; ... - The Astrophysical Journal. Letters

We present the first cosmological parameter constraints using measurements of type Ia supernovae (SNe Ia) from the Dark Energy Survey Supernova Program (DES-SN). The analysis uses a subsample of 207 spectroscopically confirmed SNe. Ia from the first three years of DES-SN, combined with a low-redshift sample of 122 SNe from the literature. Our "DES-SN3YR" result from these 329 SNe. Ia is based on a series of companion analyses and improvements covering SN. Ia discovery, spectroscopic selection, photometry, calibration, distance bias corrections, and evaluation of systematic uncertainties. For a flat Lambda CDM model we find a matter density Omega(m) = 0.331more »« less
https://doi.org/10.3847/2041-8213/ab04fa
First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: Constraints on Cosmological Parameters

Journal Article Abbott, T.; Allam, S.; Andersen, P.; ... - The Astrophysical Journal. Letters (Online)

We present the first cosmological parameter constraints using measurements of type Ia supernovae (SNe Ia) from the Dark Energy Survey Supernova Program (DES-SN). The analysis uses a subsample of 207 spectroscopically confirmed SNe Ia from the first three years of DES-SN, combined with a low-redshift sample of 122 SNe from the literature. Our "DES-SN3YR" result from these 329 SNe Ia is based on a series of companion analyses and improvements covering SN Ia discovery, spectroscopic selection, photometry, calibration, distance bias corrections, and evaluation of systematic uncertainties. For a flat LCDM model we find a matter density Omega_m = 0.331 +_more »« less
Cited by 143
https://doi.org/10.3847/2041-8213/ab04fa

Full Text Available

Similar Records