| ABSTRACT
When we think about the evolution of
matter in the Universe, we usually consider a series of causally
connected stages: the Big Bang; the gas of unconfined quarks; dark
matter; coalescence into hadrons; atoms and molecules; cosmic
plasmas; gravitational condensation; formation and evolution of
stars and galaxies; annealing of dust grains and the formation of
cold bodies like asteroids, planets and moons. But that's not the
end of the story. Albeit in only a very tiny region (or regions?) we
have the appearance of self-organizing complex matter, living cells,
multicellular organisms, neural systems, conscious brains, human
self-consciousness and society. A characteristic feature of this
last hierarchical chain is that the interactions between the
participating complex systems are information-driven, i.e., they are
no longer just a linear sum of physical interactions between their
constituent parts. Another characteristic is that causation is not
"bottom-up" but "top-down", i.e., given one level (e.g., a colony of
individual cells), it is not possible to predict, on the basis of
laws and initial conditions, the development at a higher level
(e.g., how they will eventually assemble and cooperate to form a
single organism) – yet higher levels can influence lower ones.
In the whole chain from quarks to humans one can
identify three fundamental transitions, which represent truly
irreversible, non-causal discontinuities: (1) the quantum-classical
transition, with entanglement and its disruption (decoherence)
representing the fundamental irreversible mechanism; (2) the
appearance of information-driven interactions, with energetically
equivalent complex molecules (e.g., nucleic acids) interacting with
their environment based on order and form rather than the linear sum
of forces; and (3) the appearance of a neural processing system (the
human brain) that can work coherently on its own output without any
concurrent external information input. Between (1) and (2), and (2)
and (3), physical and Darwinian evolution, respectively, proceeds in a
continuous manner. I will discuss these three fundamental transitions
and their implications for a better understanding of the whole system
(including ourselves).
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