- #1
glengarry
- 140
- 1
Over the years, I am slowly becoming more radicalized about what QM is trying to tell us about our world. I am coming to a point where I am close to giving up entirely by just saying that it tells us nothing at all (don't get too bothered by this statement... just let me explain...).
We are always told to think of the trajectory of an electron through space, or some such thing. In order to do this, we conjure up, say, the image of a baseball flying from a pitcher's hand into a catcher's glove.
But we are told to beware... for if there happens to be a wall with a couple of holes between the pitcher's mound and home plate, then it is said that the state of the ball exists merely as a mathematical thing called a wavefunction (ψ). Which is to say that there is no way to speak about the physical reality of the ball as it is in transit. The only things that we know are that it leaves one place and that it arrives at another. That's all she wrote when it comes to our knowledge of the actual object.
Some say that the ball is in an indeterminate/wavy state while in transit, and some go further by saying that even asking the question of the state of the ball is a fundamental misunderstanding of the concepts in question... sort of like asking the marital status of the number 5. I am one of those who likes to take this extreme position, but up until now, I've never really thought about the precise reason why I do.
The law of identity through time is a fundamental axiom when doing classical mechanics. That is, we implicitly assume that a thing "stays the same" between any two moments in time. When doing QM, however, the law of identity no longer applies... not because it is a kind of "weird" (fuzzy/wavy/many-worldly) logic of things, but rather because it is not any kind of logic of *things*. It is rather a logic of the *measurement* of things.
We can say that a quantum object is nothing more and nothing less than a set of numbers. The values attained from measuring devices are the only "reality" that QM concerns itself with. The sensual reality of the experimental setup has nothing whatever to do with the subject at hand.
We can take a clue from relativity theory by saying that quantum objects are simply "events", and the only thing we can say about them are the readings that are displayed in their aftermath. The very radical idea I've been playing with is that a position in time should properly be a part of the "constitution" of a quantum object. Given that it makes no sense to assert that two times can ever be identical, we can then deduce that all quantum objects that are "constituted" by different times are necessarily different (ie, the law of identity fails to hold).
Lastly, I think it is time to eliminate all traces of the concept of "substance" from our discussions of QM, because assuming its existence is the thing that leads to so much confusion and potential conflict in forums like this. After all, bare substance is that which is devoid of all sensual characteristics (the secondary qualities of John Locke). A 1 m^3 volume that endures for 1 second is an example of substance (it consists of only primary qualities). Substance has no place in the domain of QM, because without the ability to sense anything, then the concept of measurement is entirely moot.
I'll end by summarizing my major points:
1) QM is not a logic of things but rather of the measurements of things
2) A quantum object is a purely formal set of values
3) From relativity, we might be wise to include time within this set of values
4) All quantum objects that have different time values are necessarily logically different
5) Substance is a purely philosphical concept that only confuses and frustrates students when trying to learn QM
We are always told to think of the trajectory of an electron through space, or some such thing. In order to do this, we conjure up, say, the image of a baseball flying from a pitcher's hand into a catcher's glove.
But we are told to beware... for if there happens to be a wall with a couple of holes between the pitcher's mound and home plate, then it is said that the state of the ball exists merely as a mathematical thing called a wavefunction (ψ). Which is to say that there is no way to speak about the physical reality of the ball as it is in transit. The only things that we know are that it leaves one place and that it arrives at another. That's all she wrote when it comes to our knowledge of the actual object.
Some say that the ball is in an indeterminate/wavy state while in transit, and some go further by saying that even asking the question of the state of the ball is a fundamental misunderstanding of the concepts in question... sort of like asking the marital status of the number 5. I am one of those who likes to take this extreme position, but up until now, I've never really thought about the precise reason why I do.
The law of identity through time is a fundamental axiom when doing classical mechanics. That is, we implicitly assume that a thing "stays the same" between any two moments in time. When doing QM, however, the law of identity no longer applies... not because it is a kind of "weird" (fuzzy/wavy/many-worldly) logic of things, but rather because it is not any kind of logic of *things*. It is rather a logic of the *measurement* of things.
We can say that a quantum object is nothing more and nothing less than a set of numbers. The values attained from measuring devices are the only "reality" that QM concerns itself with. The sensual reality of the experimental setup has nothing whatever to do with the subject at hand.
We can take a clue from relativity theory by saying that quantum objects are simply "events", and the only thing we can say about them are the readings that are displayed in their aftermath. The very radical idea I've been playing with is that a position in time should properly be a part of the "constitution" of a quantum object. Given that it makes no sense to assert that two times can ever be identical, we can then deduce that all quantum objects that are "constituted" by different times are necessarily different (ie, the law of identity fails to hold).
Lastly, I think it is time to eliminate all traces of the concept of "substance" from our discussions of QM, because assuming its existence is the thing that leads to so much confusion and potential conflict in forums like this. After all, bare substance is that which is devoid of all sensual characteristics (the secondary qualities of John Locke). A 1 m^3 volume that endures for 1 second is an example of substance (it consists of only primary qualities). Substance has no place in the domain of QM, because without the ability to sense anything, then the concept of measurement is entirely moot.
I'll end by summarizing my major points:
1) QM is not a logic of things but rather of the measurements of things
2) A quantum object is a purely formal set of values
3) From relativity, we might be wise to include time within this set of values
4) All quantum objects that have different time values are necessarily logically different
5) Substance is a purely philosphical concept that only confuses and frustrates students when trying to learn QM