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Topic: Acoustic Metrics, and the OPERA neutrino result
Replies: 5   Last Post: Feb 16, 2012 11:15 AM

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Shmuel (Seymour J.) Metz

Posts: 3,473
Registered: 12/4/04
Re: Acoustic Metrics, and the OPERA neutrino result
Posted: Feb 16, 2012 11:15 AM
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In <jhhns0$q2l$>, on 02/16/2012
at 01:59 AM, Eric Baird <> said:

>I mean, it was /literally/ a non-subject, there was even a slightly
>self-serving clause in Misner, Thorne and Wheeler's "Gravitation"
>that went as far as defining a metric theory as being "a theory that
>had a metric and reduced to special relativity".

Nonsense; a definition is only a definition. Where does MTW say that a
non-metric theory is a "non-subject"?

>.... So a metric theory founded on an acoustic metric supposedly
>/wasn't/ a metric theory.

So? Neither is QDT, which is well accepted.

>It wasn't anything.

Non sequitor.

>If you thought "rigorously" using MTW definitions, then the very
>/idea/ of an acoustic metric theory was literally "unthinkable",
>in the Orwellian sense.

Really? Why doesn't the same applY to plain old QM?

>The language was too customised to support the current system
>to allow even the concept of a serious alternative,

No. Nothing in the language precludes defining new terms. Now, if you
want to complain that some of the methods are not useful for the work
that you want to pursue, that's par for the course. No sinister
machinations there, just the need to develop new machinery for new

>and an entire field of math and physics research was eliminated
>by our hacking the definitions to make alternative approaches
>impossible "by definition".

There was no hacking and nothing was eliminated. Au contaire, the
definition of "metric" in SR and GR *broadens* the definition from
Mathematics, by allowing a Lorentzian signature.

Shmuel (Seymour J.) Metz, SysProg and JOAT <>

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