On 20-12-2021 11:28, Bruce Kellett wrote:
On Mon, Dec 20, 2021 at 8:03 PM smitra <[email protected]> wrote:
On 20-12-2021 03:05, Bruce Kellett wrote:
The Born Rule cannot be derived from the Schrodinger equation; it
has
to be added as a further independent assumption. So it is not true
that Many Worlds makes only one assumption. It requires just as
many
assumptions as collapse theories.
Bruce
Yes, but with those assumptions it yields an unambiguous framework
for a
fundamental theory. In case of collapse theories, you're stuck with
a
phenomenological theory that cannot be improved, because you are not
allowed to describe observers and observations within the collapse
frameworks.
I think you are stuck on a very old-fashioned view of collapse
theories -- perhaps you are thinking only in terms of theories
dominated by Bohr's idea of a separation between the quantum and the
classical -- with the classical world necessary to give quantum
results meaning. In other words, a fundamental separation between the
observer and the observed. This, of course, is problematic in that you
cannot describe the observer in quantum terms.
But modern collapse theories, such as Flash-GRW, do not have this
limitation. There is no observer/observed distinction in such
theories, and they can easily accommodate the idea that everything,
including the observer, is quantum.
Besides, MWI is far from unambiguous. For instance, the notion of
probability is decidedly problematic in Everettian theory.
Bruce
Yes, I agree, I've read about such theories some time ago. I don't
remember the details, but I think they do predict new physics, so they
can be tested and falsified.
The notion of probability in Everettian theory is indeed problematic,
but you'll have similar problems in a Bruno-type copying experiment
where I make 99 copies of you that will observe one thing and 1 copy
will observe something else. Then all 100 observations will exist, but
you can still say that you'll expect to observe the first outcome with
99% probability.
Saibal
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