AnssiH
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Tournesol said:It is precisely because they are understood differently that we do need
to establish their meanings.
I guess what I actually meant with reality being in motion was described in the earlier posts which you haven't read, so just to re-cap, the point was to present a contrasted view from the idea that spacetime is static. In the static view all of past and all of future exists all the time, and we are simply "reading the spacetime from one location at a time".
In this view reality would be static and it does not explain in any sensical way why subjective experience is not static, other than suggesting that subjective experience is a case of some kind of metaphysical entity being in motion in spacetime. (Notice how the idea of "motion" is used in two different ways here, one is the motion of "consciousness", and other is how the consciousness is observing static things as if they are in motion)
I was pointing out that this is unnecessary assumption even if you assume that Relativity makes ALL the correct observable predictions. It's one type of mental model.
I think I need to read that page from the beginning to understand what that section is about.
But just to comment on few things at the beginning:
Time either exists or does not; if it exists it is either objective or subjective; if objective, it either involves flow or not.
The question is rather, is "time" a proper concept to understand the metaphysical nature of motion. I.e, is it fair to say that there needs to exist some sort of invisible entity called "time", before anything can move.
What do you think?
You argue against "there is only movement" with "how do you define movement without bringing time?" The point with arguing there is only movement is to remove "time" as a some kind of metaphysical entity or canvas from our conception of reality, on the basis that it is unnecessary component; motion can be metaphysical directly. It complicates matters to define speed of time and also the speed of motion on top of that.
Also, I think rather than saying time is either objective or subjective, we need to rather discuss by what degree the experience of time is subjective and by what degree we could expect it to be objective. For example, I think it is fair to say that the observed "rate of time" is not an objective property in any scheme (and when you think about this, you realize that even such a concept as "speed of time" is somewhat confused, and it is far simpler to say speed of motion)
There is a certain regularity to events e.g. if B1 is simultaneous with B2 and B2 is simultaneous with B3 then B1 is simultaneous with B3
Are you using the concept of simultaneity differently than it is used in relativity?
It conflicts with the "block universe" interpretation of relativity.
Of course it does, it is the alternative view.
Since we reject assumptions that conflict with evidence. it is based
on evidence too.
Yeah, of course, we observe things and make assumptions accordingly. What is notable is that the observation is never objectively made, since only way to interpret any sensory input is to do it according to the assumptions thus far made. This is true to any single experiment we can possibly conceive.
Yes. You have to start by taking a scientific picture
of the mid-world relationship realistically, in order
to come to your conclusions that nothing
should be taken realistically. Which is a contradiction.
To me it just means I cannot be sure of my views. Also there is a fair amount of unnecessary wordplay involved when I first say "I cannot be certain of anything", and someone says I'm contradicting myself since then I cannot be certain of being uncertain; perhaps I am certain after all. Just what I would expect to happen when our thoughts are are restricted to semantical concepts. Goes right besides the point.
But you want to reserve realism for
yourself, while telling others that they know nothing
of ontology...
I've said before that "realism" is always to a degree "naive realism", since each view of reality is a conception made of man-made concepts. I do not claim I know what reality is like. And understanding the concept of noumenons is knowledge of ontology, but it is also a realization that ontology is not answerable even in principle.
Tournesol said:AnssiH said:Map/territory relationship should not be confused with some kind of "anti-realism". It doesn't deny the existence of objective reality. It just notes that the intrinsic nature of reality is not found by classifying the stable behaviour around us into entities which have such and such properties.
...like you do here.
Where in that quote I claim to know what reality is like?
Arriving at a simple, predictive map is the
best guide we have to what reality really is.
Yeah, and it isn't an answer to ontology. No past model ever were, and no future model ever will be. They are models, they classify reality into some bits of identity with some properties, because this is useful for making predictions about the behaviour of reality. This way we know what is about to happen in reality before "reality itself" knows it, so to speak.
If thinking about them that way works, that is a good
reason it suppose they are objects with identity.
That is your basis for taking realistically the things
you take realistically. It is only problem when other
people do it, apparently.
I do think QM behaviour brings quite considerable weight to my argument about "non-objectivity of identity of things".
I think they are not.I think each QM interpretation and each interpretation of relativity is a valid example of this.
Yeah I know, on the basis that you don't think the are equivalent... You do realize though that each and everyone has been built by a human brain, after observing the same observable behaviour?
Absolutely not. The whole point of physics is to say what the
world is.
You are completely wrong here. The whole point of physics is to come up with predictive models. It is philosophy when physicists give their interpretation as to why such and such math brings out the correct predictions, since they recognize we can make many conflicting assertions here without any observable effects. Most physicists know very well.
Combining that with the valid points about what is and
isn't knowable, subtracting the various contradictions we arrive
at modest realism: we make statements about what the
real world is probably like.
Perhaps the difference in our views is simply that I think it is more proper to say "we make statements about how to correctly predict reality". This does not entail knowing any single answer to any single ontological question. It just entails having made good assumptions about what things exist (with more or less stability) and how they behave.
Since Einstein showed mass is basically just energy, and since QM behaviour showed in more detail that little things are not very stable in their identity in space and time when they move from one place to another (whatever that means), it became less reasonable to assume reality is in ontological sense like the models with which we choose to understand the behaviour of so-called sub-atomic particles.
I mean that having well-defined spatial boundaries is not the prerequisite for being metaphysically real.
Yeah, exactly. There is objective reality, but to draw boundaries is something that we do, not something that nature does. That's what I'm saying.
I'm not saying it because of "QM fuzzyness", but because it is impossible to show that some boundary we draw is more than something we have drawn for convenience. Just like the boundaries between countries are not metaphysically real, the boundary between an atom and a space cannot be said to be more than a convention.
That theory would soon run into problems.How could we say there exists a boundary even without us choosing to draw the boundary in such and such way? Can you see how one could simply choose to say that there is no such thing as space, but there are only atoms in their extended sense, and that atom is the size of its whole "influence sphere" (whatever that is thought to mean)?
Why would it run into problems? Because you are used to think in terms of space and matter duality? Why do you do that? No one has ever seen empty space. Space is filled with electromagnetic activity, which is what atoms are pretty much made of. There's no reason why you couldn't build a model where you use such terminology (and associated definitions) that there is nothing called "space". This could even be beneficial in that it removes some invalid assumptions about the "identity of location in space".
On the contrary, it is irrational to suppose that a theory
works for some reason other than modelling reality correctly.
No one is saying it isn't modeling reality correctly. You are missing the point. A weather simulation is modeling Earth's atmosphere correctly and thus it makes pretty accurate predictions. In principle we could build a weather simulation that works by moving everything according to QED. But the question is closer to something like, should it be assumed the particles move in many universes (like in MWI), or should their paths be calculated into static spacetime (transactional interpretation) or should the particles be modeled as something completely different, as if there is just a space with energy waves in interaction? Or something completely different?
Each of these would come up with the same predictions. Each of these feature ideas where things like particles and space and time are understood little bit differently, but the end result is exactly the behaviour as predicted by QED.
A man made concept of the boundary of an atom would be, for example, the place where other atoms get deflected (where atoms collide with each others).
This is the distance at which the residual electromagnetism causes a repulsion. It is not a place where there is a wall of an atom, but rather where there is such and such information about the atom. There is information about the atom further away too, and we cannot say this is a metaphysical boundary, it is a man-made boundary.
All boundaries of an atom you can think of are like this. And furthermore, when I say "information about an atom", notice how that too is true only by accepting a certain way to identify an atom and information that is "about the atom". (There already was some discussion about identity of things)
Then we are finding out what realty is in terms of our
"man made" concepts. You are implying that we don't know anything unless
reality provides us with some kind of non-man-made concepts. That doesn't
follow.
There is no such thing as non-man-made concept. There are concepts because they can be used to predict the behaviour of some system without knowing what really makes the system tick.
Also consider this question; What does an atom probably look like? Can you try and give an answer?
"more sophisticated". You said it. The sophisticated analysis is better.
More sophisticated is not the same as more fundamental. Physics simulations add more and more properties to things to calculate their behaviour more realistically (since they can't realistically go along modeling each sub-atomic particle), which can be said to be more sophistication, but it doesn't mean these properties really exist.
-Anssi
