Re: hubble's constantly expanding universe

From: N:dlzc D:aol T:com \(dlzc\) (net_at_nospam.com)
Date: 12/28/04 

Date: Tue, 28 Dec 2004 07:25:18 -0700

Dear Tom Roberts:

"Tom Roberts" <tjroberts@lucent.com> wrote in message
news:fb3Ad.6174$_X7.4018@newssvr33.news.prodigy.com...
> N:dlzc D:aol T:com (dlzc) wrote:
>> Real physical objects don't suffer well as length standards.
>
> Sure. That's why the SI meter is defined in terms of the frequency of the
> Cs hyperfine transition and a defined value for the speed of light.

<QUOTE>
The reason bound systems
remain the same size is that their Lagrangians do not change, and the
existence of an absolute [scale] of length from quantum physics requires
such bound systems to remain the same size.
<END QUOTE>

So the Lagrangian describes/maps what binding "systems"?

>> Gravity is not truly a force, so "gravitationally bound" might not mean
>> a whole lot, no?
>
> Yes, in GR gravitation is not a force, but still gravitationally bound
> makes sense, in the applicable approximation to GR.

I hate English sometimes. Of course grunts, nods, and gestures would be
all I'm left with...

I'm having difficulty with "bound" here. You are aware of my weakness.
Can you direct me to the next textbook please? Spacetime Physics and a
little on SR by Einstein was my last science read. I have not read MTW
Gravitation, and the $125 paperback price is getting steep.

It seems to me that spacetime being the product of mass energy, and
expansion of said space, equates to *no* binding. It equates to a
"loosening" in the relationship ("bonds") between bodies.

Thanks.

David A. Smith

Relevant Pages

  • Re: Doubts about relativity dogmas
    ... The equation of motion is ... You are very wrong by continuing identifying the ficticious Coriolis ... modern physics, primarily because they inherently have this property. ... phenomenon we call gravitation. ...
    (sci.physics.relativity)
  • Re: "Deep Impact" predictions
    ... >>> others), gravitation is a classical force, period. ... Now you've entered the realm of quantum mechanics. ... > incompatible with the geometrical weak equivalence principle because ... It works well in Newtonian Physics ...
    (sci.astro)
  • Re: The inconstancy of the "Universal Gravitational Constant".
    ... > in physics, but has proved to be the most difficult to determine. ... If you are going to be a spewing idiot, ... > rapidly or with greater gravitational force than do bodies of the same ... Mathematics of gravitation ...
    (sci.physics)
  • Re: Any critic of modern Physics, it has to be better...
    ... >> Rational people don't insult others who have differing opinions. ... >> recent air the opinion that current physics can't solve the problem. ... have "force" gravitation or inertial fabric-curve gravitation ... Except for the anomalous trajectories. ...
    (sci.physics.relativity)
  • Re: Tom Van Flandern and Newtonian Gravity
    ... For purposes of a complete model of gravitation, ... Physics is only concerned with the latter field in the ... Newton's three laws of motion. ... causality, reason trumps all opinions. ...
    (sci.physics.relativity)