Time Symmetry and Matter/Energy Conservation

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SUMMARY

The discussion centers on the relationship between time symmetry and conservation laws, particularly as articulated in Noether's theorem. Time symmetry is identified as a fundamental principle that explains the conservation of energy and mass, while spatial symmetry is linked to the conservation of momentum and angular momentum. Participants clarify that Noether's theorem applies to various conservation laws, each associated with its own symmetry principle, rather than a single symmetry governing all laws. The conversation emphasizes the distinction between time and spatial symmetry in the context of physical laws.

PREREQUISITES
  • Noether's theorem
  • Time symmetry in physics
  • Spatial symmetry and its implications
  • Conservation laws in classical mechanics
NEXT STEPS
  • Study Noether's theorem in detail
  • Explore the implications of time symmetry on energy conservation
  • Investigate spatial symmetry and its role in momentum conservation
  • Review advanced physics literature on symmetry principles
USEFUL FOR

Physicists, students of theoretical physics, and anyone interested in the foundational principles of conservation laws and symmetries in physics.

Rodney Flores
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I recently posted a question on energy and matter and I got a very good answer to that one so I thought another one wouldn't hurt. I understand that time symmetry is what makes all conservation laws possible as is stated in Noether's theorem. Time symmetry is what explains the conservation of matter and energy and in part also unifies the two. Because time symmetry doesn't change the way it works, and energy and matter do, would the symmetry of space not change as well?
 
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Rodney Flores said:
I recently posted a question on energy and matter and I got a very good answer to that one so I thought another one wouldn't hurt. I understand that time symmetry is what makes all conservation laws possible as is stated in Noether's theorem. Time symmetry is what explains the conservation of matter and energy and in part also unifies the two. Because time symmetry doesn't change the way it works, and energy and matter do, would the symmetry of space not change as well?

Er.. correction. The time symmetry is relevant to NOT ALL conservation laws, only the conservation of energy+mass!

The spatial symmetry is responsible for the conservation laws we see for momentum (and angular momentum if you include space anisotropy).

Noether theorem applies to not just energy conservation. It simply states that in the most general form, every conservation laws implies an underlying symmetry. So each conservation law has its own symmetry principle. You should not use one symmetry principle for all conservation laws that might not be appropriate.

Zz.
 
Well, considering my dislike for wikipedia (can you guarantee that would be the same information next month?), here's a more established reference:

http://xxx.lanl.gov/abs/physics/9807044

Zz.
 
oh no my mistake, I said "time" symmetry and when I really ment "underlying" symmetry, exactly in the sense in which you have stated Zapper (the underlying symmetry of every conservation law). Sorry for the confusion, so there is "spacial symmetry" as you have stated, is it distinct from time symmetry? (Thank you for the sources) :)
 

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