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research
Testing non-standard cosmological models with supernovae
Authors
Babourova O V
Barris B J
+16Â more
Bevington P R
Dirk Puetzfeld
Hamuy M
Kamionkowski M
Kolb E W
Lineweaver C H
Martin B R
Nakahara M
Obukhov Y N
Padmanabhan T
Press W H
Puetzfeld D
Puetzfeld D
Spergel D N
Truran J W
Xuelei Chen
Publication date
4 February 2004
Publisher
'IOP Publishing'
Doi
Cite
View
on
arXiv
Abstract
In this work we study the magnitude-redshift relation of a non-standard cosmological model. The model under consideration was firstly investigated within a special case of metric-affine gravity (MAG) and was recently recovered via different approaches by two other groups. Apart from the usual cosmological parameters for pressure-less matter
Ω
m
\Omega_{\rm m}
Ω
m
​
, cosmological constant/dark energy
Ω
λ
\Omega_{\lambda}
Ω
λ
​
, and radiation
Ω
r
\Omega_{\rm r}
Ω
r
​
a new density parameter
Ω
ψ
\Omega_\psi
Ω
ψ
​
emerges. The field equations of the model reduce to a system which is effectively given by the usual Friedmann equations of general relativity, supplied by a correction to the energy density and pressure in form of
Ω
ψ
\Omega_\psi
Ω
ψ
​
, which is related to the non-Riemannian structure of the underlying spacetime. We search for the best-fit parameters by using recent SN Ia data sets and constrain the possible contribution of a new dark-energy like component at low redshifts, thereby we put an upper limit on the presence of non-Riemannian quantities in the late stages of the universe. In addition the impact of placing the data in redshift bins of variable size is studied. The numerical results of this work also apply to several anisotropic cosmological models which, on the level of the field equations, exhibit a similar scaling behavior of the density parameters like our non-Riemannian model.Comment: 21 pages, 10 figures, uses IOP preprint style, submitted to Class. Quantum Gra
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Last time updated on 16/02/2019