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- Title
Cosmological test with the QSO Hubble diagram.
- Authors
López-Corredoira, M.; Melia, F.; Lusso, E.; Risaliti, G.
- Abstract
A Hubble diagram (HD) has recently been constructed in the redshift range using a nonlinear relation between the ultraviolet (UV) and X-ray luminosities of quasi stellar objects (QSOs). The Type Ia Supernovae (SN) HD has already provided a high-precision test of cosmological models, but the fact that the QSO distribution extends well beyond the supernova range (), in principle provides us with an important complementary diagnostic whose significantly greater leverage in can impose tighter constraints on the distance versus redshift relationship. In this paper, we therefore perform an independent test of nine different cosmological models, among which six are expanding, while three are static. Many of these are disfavored by other kinds of observations (including the aforementioned Type Ia SNe). We wish to examine whether the QSO HD confirms or rejects these earlier conclusions. We find that four of these models (Einstein-de Sitter, the Milne universe, the static universe with simple tired light and the static universe with plasma tired light) are excluded at the C.L. The quasi-steady state model is excluded at C.L. The remaining four models (CDM/CDM, the universe, the Friedmann open universe and a static universe with a linear Hubble law) all pass the test. However, only CDM/CDM and also pass the Alcock-Paczyński (AP) test. The optimized parameters in CDM/CDM are and (the dark energy equation-of-state). Combined with the AP test, these values become and . But whereas this optimization of parameters in CDM/CDM creates some tension with their concordance values, the universe has the advantage of fitting the QSO and AP data without any free parameters.
- Subjects
HUBBLE'S law; METAPHYSICAL cosmology; REDSHIFT; STELLAR luminosity function; ULTRAVIOLET radiation
- Publication
International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology, 2016, Vol 25, Issue 5, p-1
- ISSN
0218-2718
- Publication type
Article
- DOI
10.1142/S0218271816500607