Classical dynamics recent progress

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Discussion Overview

The discussion focuses on recent developments in classical dynamics, exploring whether there are ongoing efforts to expand the scope of classical physics amidst a predominant focus on quantum mechanics. Participants express interest in theoretical and experimental advancements, as well as specific areas of research within classical dynamics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants note that significant theoretical and experimental work continues in areas like condensed matter systems, soft matter, biophysics, fluid dynamics, and granular materials.
  • There is a suggestion that classical physics is not complete, with unresolved topics such as viscosity and fracture.
  • One participant expresses difficulty in finding recent works specifically on particle dynamics or rigid body dynamics, indicating a need for better search strategies.
  • Another participant mentions the importance of chaos and chaotic systems in classical dynamics research.
  • Concerns are raised about the perception that classical dynamics is subordinate to quantum mechanics, with examples provided of classical phenomena that remain unsolved and are not appropriately addressed by quantum mechanics.
  • Some participants highlight the relevance of classical dynamics to engineering fields, including aerospace, mechanical, and civil engineering.
  • There is a call for reviews of classical dynamics laws, particularly in light of experimental phenomena that may challenge or modify classical mechanics.
  • References to notable researchers in the field, such as Jerrold E. Marsden and Tudor Ratiu, are made as potential sources of information on recent progress.

Areas of Agreement / Disagreement

Participants express a range of views on the status and relevance of classical dynamics, with some arguing for its ongoing importance and others questioning its completeness. There is no consensus on the necessity for reviews or modifications to classical mechanics based on recent experiments.

Contextual Notes

Participants mention various unresolved problems in classical dynamics, such as turbulence and shock waves, indicating that these areas may require further exploration and research. The discussion reflects a diversity of perspectives on the relationship between classical and quantum mechanics.

adastra
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Hi all

I am wondering about recent developments of classical dynamics. It seems most physicists are now devoted to quantum world. Is there any effort to broaden the scopes of classical world?

Thanks
 
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I'm going to use a lot of buzzwords, but anyhow...

There's still a lot of theoretical and experimental work on condensed matter systems, especially "soft matter" and the glassy state.

Also biophysics, fluid dynamics, classical field theories, granular materials...

It's a mistake to think that classical physics is complete. There is no theory of viscosity or of fracture, for example.
 
Thanks, so how can i find the recent works in particle dynamics or rigid body dynamics? Searching doesn't help.

Thanks again
 
I don't know where you are searching, but I would try either the Journals of the American Physics Society website (http://publish.aps.org/), PubMed (http://www.ncbi.nlm.nih.gov/sites/entrez?db=PubMed), or search under "rational mechanics". I found several thousand papers easily. There's also a lot of work on molecular dynamics simulations (which I think is of marginal validity, but that's my opinion).
 
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can anyone give me the journal on
"pressure and displacement of sound waves by C. T. Tindle, American Journal of Physics, September 1984 or 1986 pg 749
 
Thanks, I normally use yahoo or google
 
You can add chaos and chaotic systems to the list.

Also, try searching in Google Scholar rather than the ordinary Google.

Claude.
 
Thanks, but yet i didn't find anything on 'rigid body motion'
 
adastra,

Per aspera, I suppose. Do you have an account at your local university library? They generally can be procured for the equivalent of 50 USD per year. More than worth it, in my opinion.
 
  • #10
I would say engineering. Its almost nothing but classical dynamics, i.e. Aerospace, Mechanical, and Civil.
 
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  • #11
@ejungkurth :

Well yah i have library membership, but hardly there's any review of F=ma or t=2(Pi)((l/g)^0.5), to tell absolute truth, there's none on that. and unfortunately that's what i am searching, : "REVIEW OF THE LAWS LAID DOWN BY CLASSICAL MECHANICS".

Perhaps i will include more details. Classical mechanics has already been reviewed in extreme cases with quantum and relativistic ideas. But i wonder if there had been in any necessity, to explain some weired experiment of phenomenon perhaps, to modify or review classical mechanics in familiar cases. Maybe some experiment that shows F=m^2.a in a very everyday environment, and everyday scale, and there's been a necessity to review classical mechanics. I am looking for such things.

@Cyrus:

Thanks for the info. I would like to know if there's any review of laws of classical dynamics is done.
 
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  • #12
adastra said:
<snip>

Perhaps i will include more details. Classical mechanics has already been reviewed in extreme cases with quantum and relativistic ideas. But i wonder if there had been in any necessity, to explain some weired experiment of phenomenon perhaps, to modify or review classical mechanics in familiar cases. Maybe some experiment that shows F=m^2.a in a very everyday environment, and everyday scale, and there's been a necessity to review classical mechanics. I am looking for such things.

@<snip>

This is a pet peeve of mine: classical dynamics is not subsumed into, or subordinate to, or even an approximation of, quantum mechanics by any stretch. For example, here are some classical phenomena on which a solution via quantum mechanics is totally innappropriate:

Turbulence
Elasticity/viscoelasticity/viscoplasticity...
Granular flow
Shock waves

None of the above are solved problems. Therefore, there is much research on solving them due to the fundamental importance these topics have to modern life: Granular flow affects billions of dollars in food and cosmetics, shock waves in air transport, material properties of real nonlinear materials like composites and biomaterials, etc. etc.

Now, a small subset of mechanics, namely the mechanics of weakly-interacting point particles, has been superceded by quantum mechanics. But that is a tiny portion of life, the universe, and everything.
 
  • #13
adastra said:
@Cyrus:

Thanks for the info. I would like to know if there's any review of laws of classical dynamics is done.

I don't know what you mean by this.
 
  • #14
Andy Resnick said:
This is a pet peeve of mine: classical dynamics is not subsumed into, or subordinate to, or even an approximation of, quantum mechanics by any stretch. For example, here are some classical phenomena on which a solution via quantum mechanics is totally innappropriate:

Turbulence
Elasticity/viscoelasticity/viscoplasticity...
Granular flow
Shock waves

None of the above are solved problems. Therefore, there is much research on solving them due to the fundamental importance these topics have to modern life: Granular flow affects billions of dollars in food and cosmetics, shock waves in air transport, material properties of real nonlinear materials like composites and biomaterials, etc. etc.

Now, a small subset of mechanics, namely the mechanics of weakly-interacting point particles, has been superceded by quantum mechanics. But that is a tiny portion of life, the universe, and everything.

“Why spend so long
On a theory that’s wrong?”
Well, it works for your everyday query! (David Morin)

I have a similar position. There are several (almost) disjoint Physics. By disjoint I mean that each one gives good answers in their own application field, but is only loosely conected to the other Physics

Coming back to classical dynamics recent progress I would look at what people like Jerrold E. Marsden, Tudor Ratiu, David Morin,... are doing
 
  • #15
Roche said:
Coming back to classical dynamics recent progress I would look at what people like Jerrold E. Marsden, Tudor Ratiu, David Morin,... are doing

Thanks, please give me how to reach them, and the full list please
 

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