Institute of Astronomy

The dark matter crisis: problems with the current standard model of cosmology and steps towards an improved model

SpeakerTalk DateTalk Series
Pavel Kroupa (Bonn)21 June 2013Institute of Astronomy Galaxies Discussion Group


The current cosmological model rests on Einstein's theory of general
relativity. In order for it to be consistent with large-scale structure
data, the existence of cosmologically relevant physical processes need
to be postulated: inflation, cold dark matter particles and dark energy.
Each of these is not well understood, but assuming the resulting
mathematical "LCDM" description is a representation of cosmological
reality, this representation can be tested in a different regime, namely
on the scales of the Local Volume of galaxies down to individual
galaxies. It is found that each test which has been designed shows the
LCDM description to fail such that the LCDM model needs to be discarded.
In particular, the Dual-Dwarf-Galaxy Theorem, which must be true in the
standard model, is falsified. The data suggest a different cosmological
model, but a definite final description is yet to be found.


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