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Jonnyb42
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I am curious what are other theories of physics at very small scales besides quantum mechanics? Especially those that aren't probabilistic and undeterminitive, (if there are any at all!)
Jonnyb42 said:I am curious what are other theories of physics at very small scales besides quantum mechanics? Especially those that aren't probabilistic and undeterminitive, (if there are any at all!)
QM uses linear algebra, abstract algebra, analysis, groups, tensors, spinors and topology, to name few.What math does quantum mechanics use? I have currently finished high school Calculus AP, (so I suppose first year college calculus,) and am prepared to learn vector calculus (and of course MUCH more afterwards). Also, which would be better to learn first, QM or General Relativity? (that probably also depends on which is more math intensive.)
haael said:QM uses linear algebra, abstract algebra, analysis, groups, tensors, spinors and topology, to name few.
GR uses only linear algebra, analysis and tensors.
What makes you say that? If there is any such opinion, it's probably the other way around. QM is much more tested experimentally in various extremes and situations than GR.haael said:Plus, GR is somewhat complete, as opposed to QM, which is still under construction, a beta version of a kind.
alxm said:E.g. 'Spin' was originally a postulate, but is now known to be a consequence of special relativity.
Jonnyb42 said:What math does quantum mechanics use? I have currently finished high school Calculus AP, (so I suppose first year college calculus,) and am prepared to learn vector calculus (and of course MUCH more afterwards). Also, which would be better to learn first, QM or General Relativity? (that probably also depends on which is more math intensive.)
DJsTeLF said:I'm intrigued by this statement. Could you perhaps take a moment to explain how or point me to an appropriate reference?
element4 already responded to that.DJsTeLF said:I'm intrigued by this statement. Could you perhaps take a moment to explain how or point me to an appropriate reference?
element4 said:But loosely speaking it turns out that these (irreducible) representations can be classified by their mass and something called a Little group.
1. For particles with [tex]m^2 > 0[/tex] (massive particles) the little group is SU(2), which physically is nothing but spin (s= 0, 1/2, 1, 3/2...).
2. For [tex]m^2 = 0[/tex] (massless particles) the little group describes helicity.
3. The last possibility is [tex]m^2 < 0[/tex] (tachyons), for which I don't remember the Little group.
I fully agree. QM - especially its application to atoms, nuclei and elementary particles - all based on the same principles and math - have been tested over decades w/o any hint for any physics not compatible with QM.element4 said:... For elementary QM you don't need any deep understanding of anything else than linear algebra and a little bit of functional analysis (not rigorous, and this is usually covered in introductory books). The rest you need only for more advanced aspects of QM.
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QM is much more tested experimentally in various extremes and situations than GR.
Classical mechanics is based on Newton's laws of motion and describes the behavior of macroscopic objects, while quantum mechanics is based on probability and describes the behavior of microscopic particles.
There are various alternative theories to quantum mechanics, such as Bohmian mechanics, pilot-wave theory, and many-worlds interpretation. However, none of these have gained widespread acceptance in the scientific community as a replacement for quantum mechanics.
The uncertainty principle, which states that the position and momentum of a particle cannot be known simultaneously, is a fundamental concept in quantum mechanics. Alternative theories may offer different explanations for this principle, but it is still a crucial component of understanding the behavior of particles at a microscopic level.
No, currently there is no alternative theory to quantum mechanics that can explain all of the observed phenomena in the microscopic world. Each theory has its own strengths and limitations, and further research is needed to develop a complete and comprehensive understanding of quantum mechanics.
Yes, there is ongoing research and development in this field as scientists continue to explore and investigate different theories and interpretations of quantum mechanics. This is a complex and ever-evolving field, and new discoveries and advancements are constantly being made.