Re: Questions (Space)

In article <1i4nzsa.1v4hneh15ubd3dN%spam@xxxxxxxxxxxxxxxxxxxx>,
spam@xxxxxxxxxxxxxxxxxxxx says...
Gerry Quinn <gerryq@xxxxxxxxx> wrote:

That's true. It's also irrelevant, unlike my observation, because no
current physics models depend on angels. On the other hand, models
based on particle interactions in flat spacetime work well for all the
other forces, and there seems no reason why they cannot be made work
for gravity.

<surprised> Is that true?? </surprised>

I'm not sure where you get that statement from. AIUI, gauge theories are
complicated (perhaps that should be AI-dont-UI).

All quantum theories of forces are based on a background spacetime,
normally flat. You can build a theory of electromagnetism based om
photons, and you can build a theory of gravitation based on gravitons.

There are certain difficulties unique to gravity, but AFAIK the main
problems are not that they cannot be solved, but that they cannot be
solved elegantly. And that is only because we do not have much
knowledge about physics at an extremely high energy. There's no
conceptual difficulty about treating gravity as an effective field
theory.

My main puzzlement here, though, is why you are so attached to flat
spacetime. I don't see any real reason for it.

Given two theories, I infer that you would prefer one with flat
spacetime over one with some other geometry. But you haven't said why.

As I said in the previous post, it's the simplest possible geometry.

Of course some theorists hope to explain geometry. I would prefer to
explain gravity first, amd then look at explaining geometry. After
all, why should just one of the forces be the cause of geometry?

- Gerry Quinn
.

Relevant Pages

  • Re: the basis of relativity
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  • Re: Questions (Space)
    ... All quantum theories of forces are based on a background spacetime, ... normally flat. ... conceptual difficulty about treating gravity as an effective field ... As I said in the previous post, it's the simplest possible geometry. ...
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  • Re: GR ?
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  • Re: Questions (Space)
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