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http://hdl.handle.net/2445/131763
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DC Field | Value | Language |
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dc.contributor.author | Hoyle, Ben | - |
dc.contributor.author | Jiménez, Raúl (Jiménez Tellado) | - |
dc.contributor.author | Verde, Licia | - |
dc.date.accessioned | 2019-04-08T11:06:02Z | - |
dc.date.available | 2019-04-08T11:06:02Z | - |
dc.date.issued | 2011-05-04 | - |
dc.identifier.issn | 1550-7998 | - |
dc.identifier.uri | http://hdl.handle.net/2445/131763 | - |
dc.description.abstract | To date, 14 high-redshift ( z > 1.0 ) galaxy clusters with mass measurements have been observed, spectroscopically confirmed, and are reported in the literature. These objects should be exceedingly rare in the standard Λ cold dark matter ( Λ CDM ) model. We conservatively approximate the selection functions of these clusters' parent surveys and quantify the tension between the abundances of massive clusters as predicted by the standard Λ CDM model and the observed ones. We alleviate the tension, considering non-Gaussian primordial perturbations of the local type, characterized by the parameter f NL , and derive constraints on f NL arising from the mere existence of these clusters. At the 95 % confidence level, f NL > 467 , with cosmological parameters fixed to their most likely WMAP5 values, or f NL ≳ 123 (at 95 % confidence) if we marginalize over prior WMAP5 parameters. In combination with f NL constraints from cosmic microwave background and halo bias, this determination implies a scale dependence of f NL at ≃ 3 σ . Given the assumptions made in the analysis, we expect any future improvements to the modeling of the non-Gaussian mass function, survey volumes, or selection functions to increase the significance of f NL > 0 found here. In order to reconcile these massive, high- z clusters with f NL = 0 , their masses would need to be systematically lowered by 1.5 σ , or the σ 8 parameter should be ∼ 3 σ higher than cosmic microwave background (and large-scale structure) constraints. The existence of these objects is a puzzle: it either represents a challenge to the Λ CDM paradigm or it is an indication that the mass estimates of clusters are dramatically more uncertain than we think. | - |
dc.format.extent | 11 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | American Physical Society | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.83.103502 | - |
dc.relation.ispartof | Physical Review D, 2011, vol. 83, num. 10, p. 103502 | - |
dc.relation.uri | https://doi.org/10.1103/PhysRevD.83.103502 | - |
dc.rights | (c) American Physical Society, 2011 | - |
dc.source | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) | - |
dc.subject.classification | Física de partícules | - |
dc.subject.classification | Experiments | - |
dc.subject.classification | Cúmuls de galàxies | - |
dc.subject.other | Particle physics | - |
dc.subject.other | Experiments | - |
dc.subject.other | Clusters of galaxies | - |
dc.title | Too big, too early? Multiple high-redshift galaxy clusters: implications | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 603936 | - |
dc.date.updated | 2019-04-08T11:06:03Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
Files in This Item:
File | Description | Size | Format | |
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603936.pdf | 884.02 kB | Adobe PDF | View/Open |
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