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Descartz2000
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Do you buy into a block Universe theory? Is this theory still highly respected? What is the perferred interpretation of 'time' among most scientists?
Highly respected? Only if you consider Special Relativity a Truth and not an approximation/useful model for predictions. The seeming quantum randomness(outcomes of scattering effects in same conditions) poses questions that cannot be addressed at this time and until some form of a TOE is on the table, every statement on determinism vs randomness is debatable. BTW, the only constant in physics is change, i keep my fingers crossed that this changes one day and we have a full TOE, but realistically this isn't going to happen in our lifetime.Descartz2000 said:Do you buy into a block Universe theory? Is this theory still highly respected?
What is the perferred interpretation of 'time' among most scientists?
My opinion is that Time is not a fundamental property of reality but just a macroscopic appearance of things. I would say it’s only a macroscopic effect. It’s something that emerges only for big things, and i would say the same for Space. Sorry guys, it's very likely that string theorists have got this one right - the notion of physical space-time, as naively as we humans see it, has to go.madness said:As I understand it, proponents of the block-universe see our universe as a static 4-dimensional block. How then do they explain our perception of passing through time, moving continually "forward"? I understand that entropy can explain an asymmetry in time, but see that as quite different to explaining time as flowing. Would proponents of the block-universe prefer to claim that time does not in fact flow, but rather that our brains impose that sensation upon us to make the world seem more intelligible?
No, I don't think it makes any sense. There could be better, more realistic bird's eye view models of our universe.Descartz2000 said:Do you buy into a block Universe theory?
I don't know. Maybe you can do a poll.Descartz2000 said:Is this theory still highly respected?
My guess is that most scientists will tell you that time is an indexing parameter (eg., associating events with clock readouts).Descartz2000 said:What is the perferred interpretation of 'time' among most scientists?
Not crazy, just incoherent. If time=change, and there is change, then there is time. Change is just a term that refers to the incongruence of two or more pictures or perceptions of some set of objects.octelcogopod said:Is it too crazy to think that there is no time, but rather only the rules that govern change?
It does, but in a wider sense. The problem again is our intuition and its pre-conceived ideas of time ad space. This is a problem that has been plaguing physics for the last 100 years. Forcing our own preconceived notions of this weird reality on its true nature is rather impossible. It's not a coincidence that the ontological questions are the hardest in physics.madness said:But the block-universe is a macroscopic description. I don't see how that would address my question.
ThomasT said:Not crazy, just incoherent. If time=change, and there is change, then there is time. Change is just a term that refers to the incongruence of two or more pictures or perceptions of some set of objects.
It seems clear enough to me that our universe is evolving, and that any given spatial configuration of it is transitory. The past doesn't exist except wrt records of it. The future doesn't exist except wrt projections of possibilities and probabilities based on records of the past.
madness said:Wavejumper - you seem to be arguing that the experience of a present moment and time flowing from past to present to future is purely psychological. Isn't that the same as what I said in my original question: "...time does not in fact flow, but rather that our brains impose that sensation upon us to make the world seem more intelligible"?
Time as a concept is close to non-existent in the quantum realm and at the Planck scale it completely disappears. This fact alone is worthy of philosophical consideration.I don't see why you call this a macroscopic effect.
The word, time, has objective referents wrt both technical and ordinary language usage.octelcogopod said:The problem as I see it is that there can't be such a thing as time, and thus there is no need for the term.
Time, as an indexing tool (clocks, calenders, etc.), is an essential part of sorting things out and communicating what's observed. The deep question of the origin of the universe, the beginning of motion, is objectively unanswerable.octelcogopod said:We don't know why things are capable of moving, or why the universe has motion at all ...
I agree with you that saying that time is why things move doesn't tell us anything. It's just saying that there's motion because there's motion.octelcogopod said:I have seen people say that the universe moves because it has a time dimension, this is what I was trying to refute.
Time, by itself, doesn't explain anything. As a tool, an indexing or ordering parameter, it helps us to communicate our sensory experience as unambiguously as possible. As a term which refers to the general motion or changes that we observe, it's just a synonym for those terms.octelcogopod said:I think time is just a model we have placed on the universe to explain our subjective experience of it.
There's no way to objectively, scientifically, know how or exactly when our universe began -- or even if it had a beginning. The 'time dimension' just refers to the motions of the objects that we observe, their changing configurations.octelcogopod said:Physically I believe the fundamental mechanisms in the quantum world, along with the momentum created from the big bang perhaps created motion in the universe. But not a time dimension.
The assumption is that there are some fundamental dynamics governing the evolution of our universe, along with emergent scale-specific organizing principles. This is what basic physical scientific research is about. It's what scientists are trying to discover, formalize, and demonstrate in increasingly more precise and comprehensive ways.octelcogopod said:If the universe is based on fundamental building blocks, and time = change, wouldn't all the change in the universe follow the same fundamental rules, and thereby be consistent all through?
WaveJumper said:Einstein was thinking past, present, and future are merely figments of our imagination, constructs built by our brains(through evolution/god) so that everything doesn’t seem to happen at once.
octelcogopod said:The problem as I see it is that there can't be such a thing as time, and thus there is no need for the term.
Descartz2000 said:It seems to me the present state for each observer is what exists. Past states and future states do not exist. Past states are just previous present states that are conceptualized in a current present state (thoughts and recall of 'past' observed events). Too, it might be said that future states are just conceptualized current present states (thoughts or predictions about events that have have not been observed yet). So, if this is true, then the present state of the observed 'now' which can include thoughts of previous and anticipated events, which is subjective, is what exists. Nothing more. This seems to lead one down a path of questioning what is 'reality' and if the essence behind this notion is only conceptual.
ConradDJ said:I very much agree with you, for each observer there is only the present moment. However each observer is in contact with many other observers, who have their own present moments, which are physically connected with each other in complicated ways. My "now" as I write this sentence is connected with your "now" if and when you read it, through electronic communication over the web. (Relativity gives us the basic space-time structure of possible communications between the "nows" of different observers.)
Yes, this does lead down a path of questioning "reality" -- but not necessarily toward a solipsistic position in which there is nothing beyond one's own subjectivity. None of us would have a subjective consciousness if we had never learned to talk and think, by participating in the web of real-time communication with other people. And we can think about real-time information-exchange in physical terms as well as human terms.
Our philosophical tradition has always assumed that the best way to think about the web of present-time communication (that we actually experience) is to embed it in an imagined "objective reality" that exists "in itself" over time -- a reality that's been around for billions of years, if not forever, and will continue more or less forever in the future. Of course no one experiences "objective reality", but it's much easier for us to imagine the world as as a body of given fact, existing over endless time, than as an evolving web of ongoing "nows" in communication with each other. But to me, this poses an intellectual challenge of profound interest -- learning to imagine the world we actually experience together.
Descartz2000 said:But, what if the world is a body of given facts and relationships, however, it takes a mind or or consciousness to complete the equation? What if the mind is a tool that is able to categorize and process this 'external' information, but the world is only external when observed (or rather, it is experienced as phenomena outside of ourselves)? So, when not observed the "so-called external world" does not exist, as it is not separate from the mind.
Block Universe Theory, also known as the Block View of Time, is a philosophical theory that states that time is a single entity, with past, present, and future all existing simultaneously and unchangeably. This theory challenges the traditional idea of time as a linear progression, and suggests that all events, past, present, and future, are equally real and coexist in a block-like structure.
According to Block Universe Theory, time is not a flowing river, but rather a stationary block. This means that all events, from the past, present, and future, are already determined and exist simultaneously. The past is seen as unchangeable and the future is seen as already existing, waiting for us to experience it.
There is no direct scientific evidence that supports Block Universe Theory. However, some physicists have suggested that certain theories, such as Einstein's theory of relativity, align with the idea of a block-like time structure. Additionally, some interpretations of quantum mechanics suggest that all possible outcomes of an event exist simultaneously, which could be seen as supporting the concept of a block universe.
One major criticism of Block Universe Theory is that it goes against our common sense understanding of time and the idea that we have free will to make choices that affect the future. Additionally, some argue that the theory is not testable or falsifiable, making it difficult to prove or disprove.
Block Universe Theory is often associated with the concept of determinism, which is the idea that all events, including human actions, are determined by previous events and natural laws. This is because in a block universe, all events are seen as predetermined and unchangeable, suggesting that free will may be an illusion.