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EJN
Carpal Tunnel
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Reged: 11/01/05

Loc: 53 miles west of Venus
Re: C new [Re: llanitedave]
      #6020038 - 08/12/13 12:34 AM

Quote:

No discussion on c is complete without referencing the definitive book on the subject:

K & R






Does this mean that if faster-than-light travel were possible,
it would be C++ ?



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llanitedave
Humble Megalomaniac
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Reged: 09/26/05

Loc: Amargosa Valley, NV, USA
Re: C new [Re: EJN]
      #6020139 - 08/12/13 02:12 AM

Unless, of course, the universe is interpreted.

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Otto Piechowski
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Reged: 09/20/05

Loc: Lexington, KY
Re: C new [Re: llanitedave]
      #6020652 - 08/12/13 12:12 PM

It might have been drl, but refresh my memory if this is wrong.

Didn't he say what Greg and Peter have been saying, that inflation may not have happened, and maybe its the constants which are changing? Something like that?

Otto


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scopethis
Postmaster
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Reged: 05/30/08

Loc: Kingman, Ks
Re: C new [Re: Otto Piechowski]
      #6020703 - 08/12/13 12:38 PM

that would seem to truly uphold the Relativity Theory, that everything is relative to the viewer...

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Qwickdraw
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Reged: 03/03/12

Loc: Ann Arbor, MI
Re: C new [Re: Jarad]
      #6021273 - 08/12/13 05:09 PM

Quote:

Good question.

Danny can probably give a much better answer than I can. But for at least a first level answer, C is determined from 2 other physical properties of the vacuum - permeability (the magnetic constant) and permittivity (the electric constant). Wiki link

As to why those two physical constants are what they are, I can't give you an answer beyond they are built into the nature of our space-time. Maybe someone else can add a deeper insight.

Jarad




Of course ad nauseum, you can now ask yourself, self, why than is the magnetic constant the electric constant at the values they are? I suppose you can kick this down the road as long as you can maintain your sanity.


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llanitedave
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Reged: 09/26/05

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Re: C new [Re: Qwickdraw]
      #6021894 - 08/12/13 11:15 PM

If the constants are changing, they'd all have to change in sync with one another, which in a practical sense means they aren't changing.

Otherwise, the values of the weak force and the strong force would also be changing. Atoms might be possible in some eras but not others, stellar characteristics and reactions would change over time, and there would be no continuity to the cosmos.

On the contrary, we have firm evidence that the constants of nature which affect matter as we know it have been constant for at least 1.7 billion years on Earth, from among other things studying the products from the Oklo fission events. The fact that type 1A supernovae appear identical throughout the history of the observable universe is also pretty strong evidence in favor of constant constants.


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