dc.contributor.author |
Heavens, A
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dc.contributor.author |
Fantaye, Y
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dc.contributor.author |
Sellentin, E
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dc.contributor.author |
Eggers, H
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dc.contributor.author |
Hosenie, Z
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dc.contributor.author |
Kroon, Steve
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dc.contributor.author |
Mootoovaloo, A
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dc.date.accessioned |
2018-01-31T06:50:43Z |
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dc.date.available |
2018-01-31T06:50:43Z |
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dc.date.issued |
2017-09 |
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dc.identifier.citation |
Heavens, A. et al. 2017. No evidence for extensions to the standard cosmological model. Physical Review Letters, vol. 119(10): 1-5 |
en_US |
dc.identifier.issn |
0031-9007 |
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dc.identifier.uri |
DOI: 10.1103/PhysRevLett.119.101301
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dc.identifier.uri |
https://arxiv.org/pdf/1704.03467.pdf
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dc.identifier.uri |
http://hdl.handle.net/10204/10002
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dc.description |
Article published in Physical Review Letters, vol. 119(10): 1-5 |
en_US |
dc.description.abstract |
We compute the Bayesian Evidence for models considered in the main analysis of Planck cosmic microwave background data. By utilising carefully-defined nearest-neighbour distances in parameter space, we reuse the Monte Carlo Markov Chains already produced for parameter inference to compute Bayes factors B for many different model-dataset combinations. Standard 6-parameter flat CDM model is favoured over all other models considered, with curvature being mildly favoured only when CMB lensing is not included. Many alternative models are strongly disfavoured by the data, including primordial correlated isocurvature models (lnB=-7.8), non-zero scalar-to-tensor ratio (lnB=-4.3), running of the spectral index (lnB=-4.7), curvature (lnB=-3.6), non-standard numbers of neutrinos (lnB=-3.1), non-standard neutrino masses (lnB=-3.2), non-standard lensing potential (lnB=-4.6), evolving dark energy (lnB=-3.2), sterile neutrinos (lnB=-6.9), and extra sterile neutrinos with a non-zero scalar-to-tensor ratio (lnB=-10.8). Other models are less strongly disfavoured with respect to flat CDM. As with all analyses based on Bayesian Evidence, the final numbers depend on the widths of the parameter priors. We adopt the priors used in the Planck analysis, while performing a prior sensitivity analysis. Our quantitative conclusion is that extensions beyond the standard cosmological model are disfavoured by Planck data. Only when newer Hubble constant measurements are included does CDM become disfavoured, and only mildly, compared with a dynamical dark energy model (lnB~+2). |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
American Physical Society |
en_US |
dc.relation.ispartofseries |
Worklist;20083 |
|
dc.subject |
A cosmological constant |
en_US |
dc.subject |
Standard cosmological model |
en_US |
dc.subject |
ACDM |
en_US |
dc.title |
No evidence for extensions to the standard cosmological model |
en_US |
dc.type |
Article |
en_US |
dc.identifier.apacitation |
Heavens, A., Fantaye, Y., Sellentin, E., Eggers, H., Hosenie, Z., Kroon, S., & Mootoovaloo, A. (2017). No evidence for extensions to the standard cosmological model. http://hdl.handle.net/10204/10002 |
en_ZA |
dc.identifier.chicagocitation |
Heavens, A, Y Fantaye, E Sellentin, H Eggers, Z Hosenie, Steve Kroon, and A Mootoovaloo "No evidence for extensions to the standard cosmological model." (2017) http://hdl.handle.net/10204/10002 |
en_ZA |
dc.identifier.vancouvercitation |
Heavens A, Fantaye Y, Sellentin E, Eggers H, Hosenie Z, Kroon S, et al. No evidence for extensions to the standard cosmological model. 2017; http://hdl.handle.net/10204/10002. |
en_ZA |
dc.identifier.ris |
TY - Article
AU - Heavens, A
AU - Fantaye, Y
AU - Sellentin, E
AU - Eggers, H
AU - Hosenie, Z
AU - Kroon, Steve
AU - Mootoovaloo, A
AB - We compute the Bayesian Evidence for models considered in the main analysis of Planck cosmic microwave background data. By utilising carefully-defined nearest-neighbour distances in parameter space, we reuse the Monte Carlo Markov Chains already produced for parameter inference to compute Bayes factors B for many different model-dataset combinations. Standard 6-parameter flat CDM model is favoured over all other models considered, with curvature being mildly favoured only when CMB lensing is not included. Many alternative models are strongly disfavoured by the data, including primordial correlated isocurvature models (lnB=-7.8), non-zero scalar-to-tensor ratio (lnB=-4.3), running of the spectral index (lnB=-4.7), curvature (lnB=-3.6), non-standard numbers of neutrinos (lnB=-3.1), non-standard neutrino masses (lnB=-3.2), non-standard lensing potential (lnB=-4.6), evolving dark energy (lnB=-3.2), sterile neutrinos (lnB=-6.9), and extra sterile neutrinos with a non-zero scalar-to-tensor ratio (lnB=-10.8). Other models are less strongly disfavoured with respect to flat CDM. As with all analyses based on Bayesian Evidence, the final numbers depend on the widths of the parameter priors. We adopt the priors used in the Planck analysis, while performing a prior sensitivity analysis. Our quantitative conclusion is that extensions beyond the standard cosmological model are disfavoured by Planck data. Only when newer Hubble constant measurements are included does CDM become disfavoured, and only mildly, compared with a dynamical dark energy model (lnB~+2).
DA - 2017-09
DB - ResearchSpace
DP - CSIR
KW - A cosmological constant
KW - Standard cosmological model
KW - ACDM
LK - https://researchspace.csir.co.za
PY - 2017
SM - 0031-9007
T1 - No evidence for extensions to the standard cosmological model
TI - No evidence for extensions to the standard cosmological model
UR - http://hdl.handle.net/10204/10002
ER -
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en_ZA |