On 2/28/2022 1:12 PM, Jesse Mazer wrote:
Superdeterminism goes well beyond Laplacean determinism. Determinism is just about the dynamical laws--if you know some "initial" state of the universe at time T1, it says you can perfectly predict the state at a later time T2 (or an earlier time, in a time-symmetric theory). Superdeterminism is a constraint on the initial conditions which is meant to rule out some broad class of possible worlds that are *not* ruled out by the dynamical laws.

In a deterministic system any given initial condition rules out infinitely many futures.

In quantum theory, superdeterminism is invoked to allow for the possibility that the dynamical laws are local realist ones (of a single-world kind), so that under "generic" initial conditions one would expect statistically to see Bell inequalities respected (in contradiction to quantum predictions), but superdeterminism constrains the initial conditions to a special set

Then postulating that the initial conditions were in this set seems like just another dynamical law; like Born's rule.

Brent

which predetermine that experimenters doing Bell tests will routinely see Bell inequalities violated. This is why, in stating the assumptions needed to prove Bell's theorem, physicists will specify that they are assuming superdeterminism is false by referring to the "no-conspiracy" assumption, so named because superdeterminism is understood conceptually as a kind of conspiracy in the initial conditions of the universe that makes us think the dynamical laws are very different from what they actually are.

Jesse

On Mon, Feb 28, 2022 at 3:31 PM Brent Meeker <meekerbr...@gmail.com> wrote:



    On 2/28/2022 11:49 AM, John Clark wrote:
    On Mon, Feb 28, 2022 at 2:22 PM Brent Meeker
    <meekerbr...@gmail.com> wrote:

        > /Sabine seems to argue against free will as the source of
        statistical independence...which might be true. /


    It's neither true nor untrue because "free will" is just gibberish

        /> I don't see that it has anything to do with Occam's
        razor.  It just says the universe is deterministic (as
        Laplace thought) and it started in some one definite state
        and nothing random ever happened. /


    Determinism just means a future state of the universe can be
    calculated from the information in a previous date, but it says
    nothing about the initial condition of the universe.
    Superdeterminism says in addition that out of all the huge, and
    possibly infinite, number of states the universe could've started
    out in it started out in the one in only state that would not
    only produce humans after 13.8 billion years but humans who would
    always just happen to perform the wrong experiments so that they
    would always be fooled into thinking that the universe was random
    and non-local when in reality it was neither. And it's literally
    impossible for there to be a theory with a greater violation of
    Occam's razor than that.

    That's like saying it's violation of Occam's razor that some buy
    won a million dollars in the lottery because it was so improbable
    that he won.  If the universe started out in some definite state
    and it evolved deterministically then that it produced humans who
    did certain things is no more remarkable than if had produced
    Martians who did something different. Already the definite initial
    state and determinism imply all subsequent states.  That seems
    pretty simple.  And how is it different from MWI which is also
    deterministic?  Nobody seemed worried about superdeterminism when
    Lagrange wrote about it.  Was it just because he failed to extend
    it to human decisions?  Aren't you a compatibilist; you believe in
    will, but physically determined will?

    Brent


        /> I don't buy it...I'm not even sure it's operationally
        distinct from good old quantum randomness.  But then I don't
        buy MWI either./


    I don't buy it either. Many Worlds is better than
    Superdeterminism, Copenhagen is better than Superdeterminism, "I
    don't know" is better than Superdeterminism, even Shut Up And
    Calculate is better than Superdeterminism.

    John K Clark    See what's on my new list at Extropolis
    <https://groups.google.com/g/extropolis>
    sua


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