Model selection based on the angular-diameter distance to the compact structure in radio quasars
Author
Melia, Fulvio
Affiliation
Univ Arizona, Dept Phys, Appl Math ProgramUniv Arizona, Dept Astron
Issue Date
2018-09-03
Metadata
Show full item recordPublisher
IOP PUBLISHING LTDCitation
F. Melia 2018 EPL 123 39001Journal
EPLRights
Copyright © EPLA, 2018.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Of all the distance arid temporal measures in cosmology, the angular-diameter distance, d(A)(z), uniquely reaches a maximum value at some finite redshift z(max )and then decreases to zero towards the Big Bang. This effect has been difficult to observe due to a lack of reliable, standard rulers, though refinements to the identification of the compact structure in radio quasars may have overcome this deficiency. In this letter, we assemble a catalog of 140 such sources with 0 less than or similar to z less than or similar to 3 for model selection and the measurement of z(max). In flat Lambda CDM, we find that Omega(m) = 0.24(-0.09)(+0.1) fully consistent with the Planck optimized value, with z(max) = 1.69. Both of these values are associated with a d(A)(z) indistinguishable from that predicted by the zero active mass condition, rho + 3p = 0, in terms of the total pressure rho and total energy density rho of the cosmic fluid. An expansion driven by this constraint, known as the Rh = ct universe, has z(max )= 1.718, which differs from the Lambda CDM optimized value by less than similar to 1.6%. Indeed, the Bayes Information Criterion favours R-h = ct over flat Lambda CDM with a likelihood of similar to 81% vs. 19%, suggesting that the optimized parameters in Planck Lambda CDM mimic the constraint p = -rho/3.Note
12 month embargo; published 3 September 2018ISSN
1286-4854Version
Final accepted manuscriptSponsors
Chinese Academy of Sciences Visiting Professorships for Senior International Scientists [2012T1J0011]; Chinese State Administration of Foreign Experts Affairs [GDJ20120491013]Additional Links
http://stacks.iop.org/0295-5075/123/i=3/a=39001?key=crossref.632ac74a4ae61417a6d631d07df50f81https://arxiv.org/pdf/1808.01846.pdf
ae974a485f413a2113503eed53cd6c53
10.1209/0295-5075/123/39001