home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: talk.philosophy.misc
- Path: sparky!uunet!destroyer!cs.ubc.ca!unixg.ubc.ca!kakwa.ucs.ualberta.ca!c251005
- From: c251005@cs.UAlberta.CA (c251 TA)
- Subject: Re: DETERMINISM 2: Another `refutation.'
- Message-ID: <1992Nov6.201429.27694@kakwa.ucs.ualberta.ca>
- Sender: news@kakwa.ucs.ualberta.ca
- Nntp-Posting-Host: assn113.cs.ualberta.ca
- Organization: University of Alberta
- References: <spurrett.18.720882738@superbowl.und.ac.za> <1d9t7nINN24k@agate.berkeley.edu>
- Date: Fri, 6 Nov 1992 20:14:29 GMT
- Lines: 55
-
- In article <1d9t7nINN24k@agate.berkeley.edu> lizi@soda.berkeley.edu (Cosma Shalizi) writes:
- >>DETERMINISM 2: `Refutation' number two.
- > A hopeful title...
- >
- >> Atomic-type things, for example Neutrons, have things called `half
- >> lives' which are periods of time over which half of any given collecion
- >> of the type of thing in question will `decay', or change into something
- >> else.
- > Okay so far.
- >> The QM description of things involves treating every Neutron (sticking
- >> with our current example) as identical. Indeed it involves treating them
- >> as `the same' to the extent, in effect, of regarding there as being only
- >> _one_ (busy as a one legged man at an ass kickin' contest) Neutron in ex-
-
- I disagree, indiscernability does not imply identity, review the "bundle"
- view of existence whereby an object only exists in terms of its outward
- characteristics, ie: a red ball is a red ball because it looks red, is kinda
- small, round, has a certain elasticity, etc. Since we can still identify
- two neutrons by their canonical coordinates, there is no convincing evidence
- (to me at least) that these are the same particles.
-
- >> istence. To repeat: we have no theoretical reason to regard two
- >> `different' Neutrons as different. _BUT_ of any two, over the half-life
- >> period, only _ONE_ will decay.
- > Well, not exactly. The half-life is the period during which it is
- >damn likely that half will decay, but it appears to be statistical - there's
- >nothing in the math which prevents no member of any arbitrarily large group
- >of neutrons from decaying over any time period.
-
- Or both for that matter
-
- >> From situations between which we have no reason to distinguish, we get
- >> clearly _different_ outcomes. Hence the falsity of determinism, which
- >> holds that the way the past was/present is necessitates a unique (and al-
- >> ready specifed/specifiable) future.
- > Indeed, _if QM is correct_. A hidden-variables theorist would
- >tell you that there was, in fact, some difference between the two neutrons,
- >hidden away in the clockwork that made them tick. At this point I begin
- >to approach my level of incompetence: I'm not sure if the hidden
- >variable theories propose any way to examine the inner mechanisms. Whether
-
- In fact they did and in a very famous experiment posed by John Bell it was
- proved decisively that Einstein's hidden variable hypothesis is incorrect.
- Ie: There is no possible way for us to predict the outcome of any (quantum)
- experiment with certainty, determinism as such is dead. However, there may
- be some interpretations of QM which allow a 'kind' of determinism that of
- course WE can't measure, but as Popper would say, if you can't test a theory,
- it's just mysticism (sorry Popper).
-
- >or not they do, if such theories are correct, then the quantum argument
- >against determinism fails. (Personally, I think that on the quantum
- >level the world is not deterministic, but a) I haven't studied this too
- >deeply and b) I'm just an undergrad. Caveat lector.)
- >
- >> Any thoughts?
-