Way above my pay grade, Sound waves no longer transverse or perpendicular?

Interesting, thought provoking (for some) paper on sound waves and the new wave of sound.

I am a bot thirsty for knowledge and useless information.



Wow! Thanks for sharing this! I have always felt there is much more about how we perceive sound than current science knows of. Perhaps this is the breakthrough we have been waiting for!!

"Way above my pay grade"

Yeah, I would have to agree with you on that.

Key quote from the article:

we demonstrated for the first time that it can be a transverse wave under certain conditions.

Allow me to translate: 

"We did some crazy esoteric experiments no one will find useful for 20 years (if even then), but it was unexpected and we spent a ton of money so cut us some slack, okay?"


The scientists  created transverse sound waves they didn't observe them in nature. So it could be an interesting basis for future research or possibly not. Finding that behavior in nature would have been an amazing discovery but it's still very clever.

You wanna cry? Don't hold it in. Let it out. There, there. Want a hug?

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jerryg123 - OK, maybe a bit blunt, but I think you've perfectly nailed what most of us think of the guy that fancies himself some sort of Einstein.


12-19-2021 2:06pm

@millercarbon you are a putz and a wanker.

Much like the polarities of shear that travel thru all materials and that make all materials sound different from each other..been on that rap for years.  Nothing new about shear waves but their travel in air was never described  before and was simply stated that shear cannot travel in air. Tom


Anyone catch the comment about imaging? The hope is this unusual and difficult to attain property of sound might be used to improve things like ultrasound.


Ok, I read it and mostly theoretical at this point.  Note use of "under certain conditions", "he conceived of "meta-atoms", "synthetic  shear".  So the notion relies on these meta-atoms that have boundaries or discrete packets within the (air) medium.  "Hard" shells as it were.  There is only one sentence that says that this research had been observed.  Seems a bit under-emphasized.

So he's basically said that instead of a (example) swimming pool of water, it's filled with say a hundred thousand water-balloons.  These balloons can then transmit or pass a version of shear by virtue of their rubber, touching boundaries when excited by a normal longitudinal wave.  Problem is air (a liquid) is amorphous and always in motion/swirling and doesn't posess cells with "hard" boundaries.   Yes, compressional waves convert a portion of energy to shear at every boundary and vice versa but that's in a solid.  When liquid is encountered conversions cease.

Now maybe this model adapts to a "liquid" like our bodies which has cell boundaries while being mostly water?

Let's see the observational research.  This is theoretical for now to my reading.


Boundaries can be placed inside a container so they can be made to actively generate  shear thru discrete porous surfaces and then realigned to increase laminar flow through and around those same boundaries. I have applied some of these principles to my audio room for a couple years now. This paper partially explains the reason why my application works. Tom

@theaudiotweak for sure but that's my point.  You can (did) place real  physical boundaries etc and generate that vector redirection.  Not seeing what that is this doesn't mean you produced shear in air.  Producing laminar flow isn't a shear/compression thing.  It's lack of turbulence.  And you urely didn't "envision" those boundaries and make that happen in a mathematical model.  This researcher modeled air to act like a solid by contriving a set of boundaries and voila, it passes shear (mathematically).  You actually do something physical by your description.  


My workarounds are conceived because of the transition of shear waves to compressive and their repetition of form and inner action. I am fascinated with the concept of a reactive boundary layer on a surface and the turbulent air on that boundary and the resulting sound it makes. This published article which I received a few days ago with its illustrations has helped me conceive a couple other ways to overcome boundary interference while increasing laminar flow.  Now to experiment and listen some more.

That boundary layer is like a purgatory between heaven and hell.

Trying to work with and make it sound heavenly at least to my ears.