What physics would look like if QM had not been invented?

In summary, the conversation discusses the development of classical mechanics and the axioms of quantum mechanics in the early 20th century. It raises questions about the possibility of alternative histories and the potential for different civilizations to develop the same understanding of physics. The conversation also mentions the free-fall atomic model and its surprisingly accurate predictions. Ultimately, it is suggested that the final theory of quantum mechanics would likely have similar components regardless of the initial models and interpretations.
  • #1
jarekduda
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It is hard to imagine that classical mechanics could develop in an essentially different way - Newton, derivatives, Coulomb etc. This seems a very natural evolution of understanding and intuitions.

However, the early XX century physics: axioms of QM (and GRT) seems strongly dependent on a relatively small group of people deciding the foundations, which violate natural intuitions.
What if these were some other people?
What if such drastic change of thinking did not get sufficient solidarity?
Are these axioms really universal?
What if an alien civilization would reach our technological level?

This question comes from Grujic: "what would have happened had the QM not been invented?" who describes the free-fall atomic model ( https://en.wikipedia.org/wiki/Free-fall_atomic_model ) as the base of such alternative history. This modern (1957-2004) classical approach focuses on Bohr-Sommerfeld orbits degenerated to 0 angular momentum (like s orbital): nearly radial electron trajectories, which avoid collision with the nucleus due to magnetic dipole moment of electron (known since ~1925). Its author (Gryzinski) shows in many (~30) articles published in top journals (Phys. Rev. class) surprisingly good agreement with experiment - much better than Bohr, sometimes even better than quantum (mainly various scattering scenarios, but also e.g. Ramsauer effect, calculation of diamagnetic coefficient etc.). His papers have ~3000 total citations ( https://scholar.google.pl/scholar?hl=en&q=gryzinski ).

Do you think a developing alien civilization would get exactly our axioms of QM?
What if they had first the free-fall atomic model (much better agreement than Bohr), treating it as the base to develop from?
 
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  • #2
jarekduda said:
a relatively small group of people deciding the foundations
The best foundations are not decided upon but are discovered. Nothing much could have been different, except for the order of discoveries and the early history. What makes it into a modern textbook (apart from its historical introduction and the details of how the basic machinery is introduced and motivated) is essentially universal.

Even if the first models would have been very different from Bohr's, the final theory would figure states, operators, and the standard equations of motion, together with all the auxiliary material needed to solve the equations or to approximate them efficiently.
 
  • #3
jarekduda said:
Do you think a developing alien civilization would get exactly our axioms of QM?
Not exactly our axioms (which are highly tinted by interpretation, where differences abound), but almost exactly our shut-up-and-calculate part.
 
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Likes dextercioby
  • #4
This is not even science fiction. We don't have a forum where this topic is appropriate.

Thread closed
 

1. What is QM and how has it impacted physics?

Quantum Mechanics (QM) is a branch of physics that deals with the behavior of matter and energy at a very small scale, such as atoms and subatomic particles. It has had a profound impact on physics by providing a new understanding of the fundamental laws of nature and revolutionizing our understanding of the universe.

2. What would be the main differences in physics if QM had not been invented?

Without QM, our understanding of the behavior of matter and energy at the subatomic level would be very different. Many of the technological advancements that have been made possible by QM, such as transistors and lasers, would not exist. Our understanding of the fundamental forces of nature, such as gravity and electromagnetism, would also be different.

3. How would classical mechanics and other theories be affected without QM?

Classical mechanics, which is based on Newton's laws of motion, would still be a valid theory for describing the behavior of macroscopic objects, but it would not be able to explain phenomena at the subatomic level. Other theories, such as general relativity, would also be impacted as they rely on QM principles to explain certain phenomena.

4. Would our current understanding of the universe be drastically different?

Yes, our current understanding of the universe would be drastically different without QM. Many of the phenomena that QM has helped to explain, such as the behavior of particles in a quantum state and the uncertainty principle, would not be understood. Our understanding of the origins and evolution of the universe would also be altered.

5. Are there any potential alternative theories to QM?

There are some alternative theories to QM that have been proposed, such as the pilot wave theory and the many-worlds interpretation. However, these theories have not been widely accepted by the scientific community and do not fully replace QM in our current understanding of physics.

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