Then the videos are likely to be of little use to me since it is precisely the philosophical implications that have a direct bearing on the OP question. — noAxioms
Perhaps you would be more interested in offerings from Carlo such as:
I have not watched this one myself but I probably will do at some point.
I'm not going to disagree with the physics of those guys. I'm in the wrong league for that. — noAxioms
That you have no idea about this means you need to spend more time learning physics from reviewed textbooks and not pop videos and articles — noAxioms
I think we are in a 'similar' league when it comes to command of physics. If by 'pop' you mean popular then I think there is value in using any source of physics-based facts or musings. I am happy with my own attempts to improve my knowledge of physics and philosophy and require no advice from you on how I could best progress.
I have had direct communication with Tegmark and don't disagree with any of his physics, but there are some metaphysical points on which we disagree. — noAxioms
That's good to hear! There you go @EugeneW, some of these guys will enter a discourse with us humblebums! I have mixed emotions when it comes to the term 'metaphysical.' Definintions like 'after physics' or 'beyond physics' don't help but I normally do find some value when I read/view 'metaphysical' discussions.
Some molecule of Napoleon's dying breath interacts with the rock, changing the state (the momentum perhaps) of at least one particle of the rock. The rock is now different than it would have been without that measurement, thus Napoleon exists relative to that rock — noAxioms
I may have garnished more value from this if you had typed something like 'Some molecule of Napoleans consciousness (not his dying breath), as his physical body starts to disassemble, after his death...interacts with a rock.' I personally think this idea is nonsense and that such an interaction would leave the rock completely unchanged. I think it's much more likely that disassembled component parts of a dead human consciousness (whatever such quanta might be) could only 'interact' with a live conscience or a forming fetus in a woman or perhaps any living creature, but not a rock.
It is a description of a system (somewhere) from a point of view. It doesn't necessarily 'produce' anything, but the future state of the system in question, if closed, can be described by evolving the wavefunction over time using Schrodinger's equation. Not sure if you'd consider that the production of a waveform. — noAxioms
Thank you for this one. It made me search the internet with 'Wave function and the quantum world.'
I clicked on wikipedia for 'wave-function' and read about A wave function in quantum physics. I think I have been confusing wave function and wave equation. Wikipedia states:
"A wave function in quantum physics is a mathematical description of the quantum state of an isolated quantum system. The wave function is a complex-valued probability amplitude, and the probabilities for the possible results of measurements made on the system can be derived from it."
and
The wave function is a function of the degrees of freedom corresponding to some maximal set of commuting observables. Once such representation is chosen, the wave function can be derived from the quantum state.
For a given system, the choice of which commuting degrees of freedom to use is not unique, and correspondingly the domain of the wave function is also not unique. For instance, it may be taken to be a function of all the position coordinates of the particles over position space, or the momenta of all the particles over momentum space; the two are related by a Fourier transform. Some particles, like electrons and photons, have nonzero spin, and the wave function for such particles include spin as an intrinsic, discrete degree of freedom; other discrete variables can also be included, such as isospin.
and
According to the superposition principle of quantum mechanics, wave functions can be added together and multiplied by complex numbers to form new wave functions and form a Hilbert space. The inner product between two wave functions is a measure of the overlap between the corresponding physical states and is used in the foundational probabilistic interpretation of quantum mechanics, the 'Born' rule, relating transition probabilities to inner products. The Schrödinger equation determines how wave functions evolve over time, and a wave function behaves qualitatively like other waves, such as water waves or waves on a string, because the Schrödinger equation is mathematically a type of wave equation. This explains the name "wave function", and gives rise to wave–particle duality. However, the wave function in quantum mechanics describes a kind of physical phenomenon, still open to different interpretations, which fundamentally differs from that of classic mechanical waves.
I also used the linked pop-ups for more info on terms such as 'degrees of freedom and 'commuting observables' as used in quantum physics. I think I now understand more about the term wave function as used in quantum physics.
and all waveforms moving in 3D space will produce a worldline as it traverses space from its origin.
No. Wavefunctions are not objects that move around. They're descriptions. — noAxioms
I was referring to waveforms not the term wavefunction as I now conceive it based on the wikipedia stuff above. I was referring to something like a light wave with traditional peaks, troughs, wavelength, frequency etc, physically traveling through 3D space. All such will produce a 'worldline' based on my understanding of the term. I base this on a comment made by a physicist on Quora:
"the worldline of light behaves as ligtht-like curves in spacetime"
To word it differently, only the state of the distant star a year ago is in our past light cone, and thus the wavefunction of that star from the point of view of Earth is collapsed only to its year-old state, and its present state is not in any way fact, relative to us. Likewise, a star sufficiently distant (say 50 GLY) doesn't meaningfully exist at all relative to Earth. Unmeasured state is not meaningful to a local interpretation. That's a very hard pill to swallow, but I find it an even harder pill to abandon locality, that information can travel backwards in time or anywhere else outside its future light cone. — noAxioms
Yes, so the picture of hubble deepest field image (I have a very large framed print of it in my bedroom)
mainly contains objects which probably don't exist anymore.
I cannot understand EugeneW, so I don't think an explanation of what I mean is going to come from him. — noAxioms
He has been quite patient with me when I have demonstrated my limited knowledge of physics. He has demonstrated his deeper grasp of the topic and has not 'dismissed' me as 'not worth his efforts.' As a retired school teacher myself, I appreciate and celebrate his approach and passion for physics and I prefer it to the more pretentious and unwarranted, almost sad, aloof attitudes of other members of this forum, be the thread philosophical, scientific, religious or political. Thankfully, such attitudes are also in the minority on this forum.