On 02.01.2012 21:32 meekerdb said the following:
On 1/2/2012 12:24 PM, Evgenii Rudnyi wrote:
On 02.01.2012 07:01 meekerdb said the following:


Everett's MWI is based on QM which does assume a background time
and the state of the multiverse evolves in Hilbert space. This
evolution entails the evolution of the state of different
observers which are simultaneous.

Is an observer (or better many observers observing simultaneously)
is still necessary also by Everett's MWI? What equation then
describes an observer?

No. "Observer" is just shorthand for an interacting system that
"collapses" the wave function, i.e. couples the thing observed into
the quasi-classical environment. The observation is the mathematical
step of tracing over the environmental degrees of freedom. So, within
physics, there's an equation describing observation.

Will the wave function collapse if we solve just the Schrödiner equation?


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