Speaker
Prof.
Petter Minnhagen
(Umeå University)
Description
A simple general null-model, the Ikea network, is described
and its properties are investigated. This network is argued
to be the appropriate network for a random assembling of
links, such that both which link is attached to which and
the time-order are all distinct random possibilities. From
this point of view it is the opposite of preferential
attachment. This network is discussed in the context of
metabolic networks, where the metabolism of an organism is
reduced to a network of substances. The striking agreement
between the Ikea network and the metabolic networks implies
that the null model catches the overall features. Using the
network structure measures clustering and assortativity, a
small difference is nevertheless identified and is argued to
imply a possible evolutionary pressure. This difference is
manifested in a slight difference in the degree distribution.
