sci.physics.cond-matter

On Sep 29, 7:38 pm, Eric Gisse < ...@ >
wrote:
> On Sat, 29 Sep 2007 03:50:11 -0700, "Timothy Golden
>
>
>
> " wrote:
> >On Sep 28, 9:41 am, dvt wrote:
> >> Timothy Golden wrote:
> >> > Why then can sound transfer through the solid so quickly? If I were
> >> > to place a tiny sound source (the point of a pin) on the solid is
> >> > there any doubt that these vibrations will propagate at the speed of
> >> > sound?... Under your interpretation of the slowness effect why does
> >> > sound not suffer the same problem?
>
> >> What is the speed of sound in a solid? Pick a solid of your choice.
>
> >> Then tell me what type of wave propagates at that speed. Longitudinal?
> >> Bending? Shear? Dilatational? Bulk? How does the shape of your sample
> >> affect the speed of sound?
>
> >> My questions are intended to point out that the speed of sound in a
> >> solid is not a simple one-number answer. You have to consider the manner
> >> in which the wave propagates. Perhaps that will shed some light on your
> >> thermodynamic query.
>
> >> --
> >> Dave
> >> dvt at psu dot edu
>
> >Thanks Dave. I accept what you are saying but in some way you may be
> >complicating a simplistic argument. If these modes were extensible to
> >thermodynamics then you would have a coherent argument. Especially in
> >the case of a bar of metal some resonant modes are going to be exposed
> >so where is this in thermodynamics? The usage of the term vibration
> >for thermodynamics can only be taken as a loose analogy. In math speak
> >it seems that the term isomorphism may be appropriate but even this
> >concession is too much. Though above here I have suggested that higher
> >dimensions are not necessary I would like to delete that prediction.
>
> >In the coldest state material takes on behaviors of extraordinary
> >quality. Yet it may be that this is the native base where physical
> >theory deserves to be built with our ambient and warm version a fuzzy
> >replica of the amazing cold state. I really have no direct route here.
> >Instead there are signals in some math that I've been working on that
> >allow me to question some of these old basics. Still this is a vastly
> >open problem in need of a clean theoretical basis.
>
> >-Tim
>
> It is only "open" in the sense that you haven't opened a
> thermodynamics textbook and read it.

And you are only open in that you keep posting to this thread, control
freak.
Do you teach? I feel sorry for your students.

-Tim