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1: Upper panel: Hubble diagram of type Ia supernovae measured by the Supernova Cosmology Project and the High-z Supernova Team. Lower Panel: Residuals in distance modulus relative to an open Universe with Ω 0 = Ω m = 0.3. Taken from Perlmutter & Schmidt (2003).
Source publication
We propose to use HII galaxies (HIIG) to trace the redshift-distance relation, by means of their L(Hβ)−σ correlation, in an attempt to constrain the dark energy equation of state parameter solution space, as an alternative to the cosmological use of type Ia supernovae.
For a sample of 128 local compact HIIG with high equivalent widths of their Bal...
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Citations
... See S. Weinberg[1], or R.Chavez[2] for instructive presentations. ...
The universe is viewed as a dust gas filling a sphere and floating in
infinite empty space. Einstein's gravitational equations are applied to this
case together with appropriate boundary values. The equations are solved for
initial conditions chosen so as to describe the observed Hubble diagram. We
find that the solution is not unique so that more astronomical observations are
needed. However, those solutions which were found do not exhibit an accelerated
expansion of the universe, nor -- obviously then -- do they need the notion of
a dark energy driving such an expansion.
We present this study as an alternative to the prevailing Robertson-Walker
cosmology.
The gravitational equations of Einstein are solved for a sphere filled with a dust gas and floating in infinite empty space. It turns out that the radial acceleration of the gas has negative and positive contributions which may be interpreted as attractive and repulsive gravitational forces respectively. Two cases are considered: the collapse of a gas initially at rest and with uniform density, and the expansion of the gas with initial conditions appropriate to the observed Hubble diagram of Type Ia supernovae. The latter case may be seen as a proposal for a new type of cosmology.
