[Vision2020] Newtonian Gravity Replaced by Space/Time Geometry
Tom Hansen
thansen at moscow.com
Sun May 8 06:21:00 PDT 2005
And to think that this discussion got its start from"
"It is now 5:55 on 5/5/05."
Sheesh! To quote Donovan Arnold, "Do you guys think that you can take this
discussion off list, please."
Take care, Moscow.
Tom Hansen
Moscow, Udaho
Spring is nature's way of saying, "Let's party!"
-Robin Williams
-----Original Message-----
From: vision2020-bounces at moscow.com [mailto:vision2020-bounces at moscow.com]
On Behalf Of Donovan Arnold
Sent: Saturday, May 07, 2005 9:07 PM
To: Tbertruss at aol.com; whayman at adelphia.net; predator75 at moscow.com;
dgray at uidaho.edu
Cc: vision2020 at moscow.com
Subject: Re: [Vision2020] Newtonian Gravity Replaced by Space/Time Geometry
Ted,
Where we are mainly disagreeing is that you are
confusing observable fact for fact. They are not the
same thing.
Your write,
You're starting to sound like the advocates of
teaching creationism as a scientific theory in the
public schools who state over and over that evolution
is not a "fact" but an unproved theory.
No Ted. Creationists argue that we throw out an
unproven theory for a disproved one. I am not
suggesting this. I am arguing that your terminology
regarding validation of scientific theory is
incorrect.
Scientific facts that verify the truth of theories is
how science operates: no empirical facts to validate a
theory, a theory remains just a theory. Replication
of experimental findings that verify theories is the
cornerstone of how science connects theory with fact.
No Ted! That is incorrect. Empirical data cannot PROVE
a theory as TRUE. A theory can ONLY be disproved, it
cannot be PROVED. Therefore it cannot ever be fact.
There was a theory that the Sun and planets traveled
around the Earth. This theory was mathematically
calculated and written so that you could find the
location of the known planets in the sky at any time
of the year. There was verifiable empirical evidence
that this theory was correct. It could be repeated,
and other scientists could replicate the findings. But
that does not mean that the Sun goes around the Earth
because someone can come up with a mathematical
formula and can predict where Mars, Venus, the Moon,
and Jupiter will be six months from now.
According to your thinking it was fact that the Sun
use to revolve around the Earth. It never did, even
though a theory was supported by verifiable empirical
observation.
Empirical data provides evidence for or against a
theory. Some theories are close enough to be of
practical use and are generally accepted as fact
because they are so close and applicable. But that
does not mean that they are fact.
Just as you write,
Gravity in Relativity no longer exists as it is
described in Newtonian Physics.
No longer exists?! How could a theory be fact, then
all of a sudden no longer be fact? Are you saying that
physics changed because we discovered a more accurate
theory? Or are you saying that the empirical data
supporting the previous theory was recorded
improperly? I do not think so.
The reality is we do not know, we cannot know, if a
theory is correct or incorrect unless it is disproved
by an advancement in our understanding of physics,
which means we can only disprove a theory or lend
support to a theory through empirical observation. So
we can never say a theory is fact unless we know
everything, which we do not. We can only say empirical
observation supports a theory. If enough empirical
data supports a theory most people will accept it as
factual, like Newtonian Physics because it shadows
their reality close enough. But you cannot PROVE it to
be fact.
I also wish to point out to you Ted that many of
Einsteins theories appear to have been disproved
through empirical data observation and collection on
quantum level experiments. I invite you to read on
recent findings involving particle entanglement and
photon tunneling.
http://www.aei-potsdam.mpg.de/~mpoessel/Physik/FTL/tunnelingftl.html
http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1993PhRvL..71..708S&
amp;db_key=INST
http://www.mindfully.org/Technology/Quantum-World1nov02.htm
I leave you with the difference between a mechanic and
a physicist.
If you place a man and women on opposite ends of a 20
foot room and ask them to each move 1/2 the distance
between them every minute when will they meet?
The physicist will respond with, Never.
The mechanic will respond, For all practical
purposes, less then 10 minutes.
Take Care,
Donovan J Arnold
--- Tbertruss at aol.com wrote:
>
> Donovan wrote:
>
> "In science the Theory of Gravity is still
> just a theory."
>
> Gravity in Relativity no longer exists as it is
> described in Newtonian
> Physics. It has been replaced by mass altering the
> geometry of space/time. Objects
> near a mass (our Sun, for example) follow the
> geometry of space/time (Earth's
> orbit follows this geometry) that the mass creates,
> but are not acted upon by
> a force (gravity) at a distance, which is the
> intuitive notion that we often
> think of to imagine gravity keeping the Earth in
> orbit around our Sun.
>
> Nonetheless, the Newtonian equations dealing with
> gravity, speed, mass and
> force are perfectly workable to launch satellites
> into orbit above Earth. I
> doubt anyone at NASA uses Relativity to do the math
> to successfully launch a
> satellite into a required orbit, though I have not
> verified this. Newtonian
> physics does the job just fine.
>
> Though I disagree with you that the theory of
> gravity is "just a theory,"
> given that its predictions have been empirically
> validated over and over given
> certain limitations, it is a good example of a
> scientific theory which has been
> replaced by a more accurate theory (Relativity) to
> predict the behavior of
> matter in those cases where it is required.
>
> http://en.wikipedia.org/wiki/Gravity
>
> This below is from the link above:
>
> How spacetime curvature simulates gravitational
> force
>
> The curvature of spacetime considered as a whole
> implies a rather complex
> picture that is usually treated with the tools of
> differential geometry and that
> requires the use of tensor calculus. It is possible
> though to understand - at
> least approximately - the mechanism of gravitation
> without tensors when the
> total curvature of spacetime is split into two
> components:
>
> curvature of space
> time dilation.
>
> The above components of the curvature of spacetime,
> and only these, are
> responsible for the gravitation according to
> Einstein's theory.The effect of the
> first component, the curvature of space, is
> negligible in all cases when the
> velocities of objects are much smaller than the
> speed of light and when the
> ratios of masses divided by the distances separating
> their centers of mass are much
> smaller than a specific constant, namely the ratio
> of speed of light squared
> to Newtonian gravitational constant: . So for the
> majority of cases in the
> universe, and certainly for almost all cases in our
> solar system except
> precession of perihelion of Mercury and deflection
> of light rays in the vicinity of the
> Sun, we may treat the space as flat, as ordinary
> Euclidean space. It leaves
> us only with the gravitational time dilation as a
> possible reason for the
> illusion of "gravitational force" acting at the
> distance. Assuming that the ratio
> of masses to distances between them are smaller than
> the constant above, the
> time dilation is tiny, but it is enough to cause
> "Newtonian gravitational
> attractive force" as we know it.The reason for this
> illusion is this: any mass in
> the universe modifies the rate of time in its
> vicinity this way that time runs
> slower closer to the mass and the change of time
> rate is controlled by an
> equation having exactly the same form as the
> equation that Newton discovered as his
> "Law of Universal Gravitation". The difference
> between them is in essence not
> in form since the Newtonian potential is replaced by
> the Einsteinian time
> rate dt / dt, where t is the time at a point at
> vicinity of the mass (the proper
> time of objects at this point in space, the time
> that is measured by the
> clocks in this point) and t is the time at observer
> at infinity, with the right
> side of the equation staying the same as in
> Newtonian equation (with accuracy to
> irrelevant constants). Because of the same form of
> both equations, the path
> of the object that takes an extremum of proper time
> while traveling, and by
> this taking a geodesic in spacetime, is the same
> (with accuracy to the negligible
> in this case curvature of space) as the Newtonian
> orbit of this object around
> the mass. So it looks as if the path of the object
> were bent by some "force
> of attraction" between the object and the mass.
> Since bending of the object's
> path is clearly visible and the time dilation
> extremely difficult to notice, a
> (fictitious) "gravitational force" has been assumed
> rather than a (real,
> presently measured with precise enough and formerly
> unavailable clocks) time
> dilation as the reason for bending the paths of
> objects moving in vicinity of
> masses.So without any force involved into keeping
> the traveling object in line the
> object follows the Newtonian orbit in space just by
> following a geodesic in
> spacetime. This is Einstein's explanation why
> without any "gravitational forces"
> all the objects follow Newtonian orbits and at the
> same time why the Newtonian
> gravitation is the approximation of the Einsteinian
> gravitation.In this way
> the Newton's "Law of Universal Gravitation" that
> looked to people who tried to
> interpret it as an equation describing a
> hypothetical "force of gravitational
> attraction" acting at a distance (except to Newton
> himself who didn't believe
> that "action at a distance" is possible) turned out
> to be really an equation
> describing spacetime geodesics in Euclidean space.
> We may say that Newton
> discovered the geodesic motion in spacetime and
> Einstein, by applying Riemannian
> geometry to it, extended it to the curved spacetime,
> disclosed the hidden
> Newtonian physics, and made its math accurate.
> --------------------------------------
> V2020 post by Ted Moffett
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