1108.1373 (Marie-Noëlle Célérier)
Marie-Noëlle Célérier
During the last decade, a number of inhomogeneous cosmological models have
been put forward to explain the observed dimming of the SNIa luminosity without
resorting to dark energy. The simplest ones are spherically symmetric around
the observer, mostly belonging to the Lema\^itre-Tolman class. Their use must
be considered as a mere first step towards more sophisticated models. Spherical
symmetry is but a mathematical simplification and one must consider such models
as exhibiting an energy density smoothed out over angles around us, i.e. only
the radial inhomogeneities are taken into account. However they have been taken
to face value by some authors who tried to use them for purposes they were not
supposed to be able to fulfill or to put them to the test as if they were to be
viewed as achieved models for our observed Universe. We want here to set the
record right about the way these kinds of models must be used in cosmology and
to clarify wrong or vague statements which can be found in the literature.
View original:
http://arxiv.org/abs/1108.1373
No comments:
Post a Comment