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Dirk Van de moortel
science forum Guru

Joined: 01 May 2005
Posts: 3019

Posted: Tue Jul 18, 2006 4:58 pm    Post subject: Re: A Flaw of General Relativity, a New Metric and Cosmological Implications

"Zanket" <zanket@gmail.com> wrote in message news:ne8vg.145270\$mF2.97974@bgtnsc04-news.ops.worldnet.att.net...
 Quote: You also seem to have a very severe problem with the simple concept of asymptotes. How so?
Zanket
science forum beginner

Joined: 08 Jul 2006
Posts: 21

Posted: Tue Jul 18, 2006 5:12 pm    Post subject: Re: A Flaw of General Relativity, a New Metric and Cosmological Implications

 Quote: ... you also seem to have a very severe problem with the simple concept of limits.

I agree that I misused "limit". I changed it to "asymptote".

 Quote: Apart from formally dragging a sloppily worded statement (*), true everywhere in a uniform (linear) gravitational field, over into a spherically symmetric and highly non-uniform field, in which the statement only happens to be true for a well defined limit-set of locations, ...

A non-uniform field is everywhere uniform locally. The particle always falls
within a uniform field, itself within a larger non-uniform field. So when
the particle's velocity approaches an asymptote of c in a uniform field, it
automatically does that in a non-uniform field as well. There's no way
around that.

 Quote: ... in your first (uniform field) situation the sloppy phrase "approaching a limit of c" only refers to "objects at infinity" ...

I don't know why you think it refers to objects at infinity, when I say it's
a directly measured velocity.

 Quote: When you do that, you might immediately notice that you can cut your article short and perhaps find another hobby.

I can keep the hobby now that I've changed "limit" to "asymptote".

 Quote: (*) One example of sloppiness is the phrase: "... approaches a limit of c."

It may be sloppy, but I think the meaning is clear. I see plenty of other
web sites doing the same.

I think the meaning is still clear after correcting "limit" to "asymptote".
I also see plenty of other web sites using the shorthand "approaches an
asymptote of <value>".
Zanket
science forum beginner

Joined: 08 Jul 2006
Posts: 21

 Posted: Tue Jul 18, 2006 5:15 pm    Post subject: Re: A Flaw of General Relativity, a New Metric and Cosmological Implications I'll assume that there really wasn't a problem that you could identify.
Dirk Van de moortel
science forum Guru

Joined: 01 May 2005
Posts: 3019

Posted: Tue Jul 18, 2006 6:38 pm    Post subject: Re: A Flaw of General Relativity, a New Metric and Cosmological Implications

"Zanket" <zanket@gmail.com> wrote in message news:AD8vg.145342\$mF2.41682@bgtnsc04-news.ops.worldnet.att.net...
 Quote: ... you also seem to have a very severe problem with the simple concept of limits. I agree that I misused "limit". I changed it to "asymptote". Apart from formally dragging a sloppily worded statement (*), true everywhere in a uniform (linear) gravitational field, over into a spherically symmetric and highly non-uniform field, in which the statement only happens to be true for a well defined limit-set of locations, ... A non-uniform field is everywhere uniform locally. The particle always falls within a uniform field, itself within a larger non-uniform field. So when the particle's velocity approaches an asymptote of c in a uniform field, it automatically does that in a non-uniform field as well. There's no way around that. ... in your first (uniform field) situation the sloppy phrase "approaching a limit of c" only refers to "objects at infinity" ... I don't know why you think it refers to objects at infinity, when I say it's a directly measured velocity. When you do that, you might immediately notice that you can cut your article short and perhaps find another hobby. I can keep the hobby now that I've changed "limit" to "asymptote". (*) One example of sloppiness is the phrase: "... approaches a limit of c." It may be sloppy, but I think the meaning is clear. I see plenty of other web sites doing the same. I think the meaning is still clear after correcting "limit" to "asymptote". I also see plenty of other web sites using the shorthand "approaches an asymptote of ".

Welcome.
http://users.telenet.be/vdmoortel/dirk/Physics/Fumbles/ZanketHobby.html
You fit right in:
http://www.apa.org/journals/features/psp7761121.pdf
http://www.apa.org/journals/features/psp7761121.pdf
http://www.behavenet.com/capsules/disorders/narcissisticpd.htm
http://www.udel.edu/bkirby/asperger/aswhatisit.html
http://www.users.dircon.co.uk/~cns/
And, yes, by all means, you can and most certainly will keep
the hobby.

Dirk Vdm
Dirk Van de moortel
science forum Guru

Joined: 01 May 2005
Posts: 3019

Posted: Tue Jul 18, 2006 6:39 pm    Post subject: Re: A Flaw of General Relativity, a New Metric and Cosmological Implications

"Zanket" <zanket@gmail.com> wrote in message news:FG8vg.145353\$mF2.127585@bgtnsc04-news.ops.worldnet.att.net...

 Quote: You also seem to have a very severe problem with the simple concept of asymptotes. How so? More or less like one of these http://www.apa.org/journals/features/psp7761121.pdf http://www.apa.org/journals/features/psp7761121.pdf http://www.behavenet.com/capsules/disorders/narcissisticpd.htm http://www.udel.edu/bkirby/asperger/aswhatisit.html http://www.users.dircon.co.uk/~cns/ I'll assume that there really wasn't a problem that you could identify.

That is what autistic imbeciles usually assume when confronted
with their condition. It is normal. We see it happen al the time
on this forum. You are no exception:
http://users.telenet.be/vdmoortel/dirk/Physics/Fumbles/ZanketHobby.html
Check your soul mates.

Dirk Vdm
Tom Roberts
science forum Guru

Joined: 24 Mar 2005
Posts: 1399

Posted: Wed Jul 19, 2006 4:09 am    Post subject: Re: A Flaw of General Relativity, a New Metric and Cosmological Implications

Zanket wrote:
 Quote: Tom Roberts wrote: Go back and re-read where I described it. One can hold the frame at rest relative to the black hole, and release it just as the infalling particle reaches it; its clocks must be preset so they will be synchronized in the locally inertial frame immediately after release, and the measurement must be made immediately after release (or the measurement is not done at rest relative to the black hole). The key point is the synchronization of the clocks used to measure the infalling particle's speed. I think this measurement technique is unnecessary. For one, we on Earth measure free-fall velocity without using that technique, and those measurements are not meaningless.

But we on earth do not live in such high-field situations! In general,
the _ONLY_ velocity measurements that are reasonable and understandable
are those relative to a locally-inertial frame. _ALL_ others are bogus,
the only question is: "How bogus?", and that depends on the curvature of
the manifold and how non-inertial the coordinates actually are. For our
everyday lives, assuming the earth's surface is an inertial frame with a
gravitational force is quite adequate. But for tests of GR it is not.

IOW: in physics an important question is always: what are the errors?
What you propose does not introduce unacceptable errors in our everyday
lives, but in analyzing a black hole it does.

 Quote: See http://math.ucr.edu/home/baez/physics/Relativity/SR/clock.html: "[The postulate] tells us that noninertial objects only age and contract by the same gamma factor as that of their MCIF [momentarily comoving inertial frame]. So, any measurements we make in a noninertial frame that use clocks and rods, will be identical to measurements made in our MCIF."

That statement is not Gospel, and it omits important caveats that apply
here. <shrug>

Tom Roberts
Zanket
science forum beginner

Joined: 08 Jul 2006
Posts: 21

Posted: Thu Jul 20, 2006 8:46 am    Post subject: Re: A Flaw of General Relativity, a New Metric and Cosmological Implications

 Quote: See http://math.ucr.edu/home/baez/physics/Relativity/SR/clock.html: "[The postulate] ...

 Quote: That statement is not Gospel, and it omits important caveats that apply here.

Yes, the statement is not gospel, because theories are not gospel. But you
argue against GR. From the link: "General relativity is built on a
foundation that includes the clock postulate." That would explain why Taylor
and Wheeler do not mention your measurement technique for the same scenario.
The postulate directly contradicts you, showing that no such measurement
technique is required. "It says that our measurements of distance and time
are unaffected by any pseudo forces we feel, so that they are identical to
those of our MCIF." What caveats refute that?

And tell me, given that the postulate "has been verified experimentally up
to extraordinarily high accelerations", how would you go about proving your
claim? That is, how would you prove that the noninertial observer's
measurement is bogus, when experiments show it always equal to the
measurement in the MCIF? (Of course if you could prove your claim, GR would
be invalidated. <shrug>)

Your argument is also a red herring. You assume that the particle's velocity
is measured by noninertial observers (those at fixed altitudes). But the
particle can be the measurer. A measurement requires no action on the part
of the measured.
Zanket
science forum beginner

Joined: 08 Jul 2006
Posts: 21

 Posted: Thu Jul 20, 2006 8:46 am    Post subject: Re: A Flaw of General Relativity, a New Metric and Cosmological Implications Shocking
Dirk Van de moortel
science forum Guru

Joined: 01 May 2005
Posts: 3019

Posted: Thu Jul 20, 2006 10:38 am    Post subject: Re: A Flaw of General Relativity, a New Metric and Cosmological Implications

"Zanket" <zanket@gmail.com> wrote in message news:LpHvg.427883\$Fs1.98535@bgtnsc05-news.ops.worldnet.att.net...
 Quote: Shocking

Sorry, it was not meant to be shocking.

Dirk Vdm
Tom Roberts
science forum Guru

Joined: 24 Mar 2005
Posts: 1399

Posted: Fri Jul 21, 2006 4:54 am    Post subject: Re: A Flaw of General Relativity, a New Metric and Cosmological Implications

Zanket wrote:
 Quote: From the link: "General relativity is built on a foundation that includes the clock postulate." That would explain why Taylor and Wheeler do not mention your measurement technique for the same scenario.

The clock postulate describes how a _single_ clock behaves under
acceleration (i.e. it remains in synch with an instantaneously comoving
and collocated inertial clock, but in general that holds for only an
infinitesimal duration for each inertial clock and one needs a
succession of such inertial frames). It says nothing at all about how to
synchronize _multiple_ clocks, which is the issue I addressed in the
measurement technique I described.

 Quote: The postulate directly contradicts you, showing that no such measurement technique is required.

Not true. See above.

 Quote: "It says that our measurements of distance and time are unaffected by any pseudo forces we feel, so that they are identical to those of our MCIF." What caveats refute that?

Look up what they mean by "MCIF" and you'll see that it does NOT include
clocks in an accelerated system separated by a distance large enough to
matter (i.e. introduce errors larger than the measurement resolution).
For the case at hand, any non-infinitesimal distance matters, and a
system at rest relative to the black hole having a finite separation of
clocks is not a MCIF.

For instance, synchronize the clocks, and then make measurements on a
series of identically infalling test particles -- the symmetry of the
situation would lead one to expect those identically falling particles
will have identical speeds. But in fact the measured speeds will NOT be
the same for the different particles; they will be measured to be going
successively slower. This is simply due to the fact that the clocks in
such a frame do not remain synchronized (in _any_ frame of interest).

 Quote: But the particle can be the measurer.

That is plain and simply not true. The measurement of an object's speed
must be relative to a system of coordinates, and the particle itself
cannot do that, it requires assistants at rest in the coordinate system
having clocks synchronized in the coordinate system and rulers of the
coordinate system.

Tom Roberts
Zanket
science forum beginner

Joined: 08 Jul 2006
Posts: 21

Posted: Fri Jul 21, 2006 7:29 am    Post subject: Re: A Flaw of General Relativity, a New Metric and Cosmological Implications

 Quote: The clock postulate describes how a _single_ clock behaves under acceleration (i.e. it remains in synch with an instantaneously comoving and collocated inertial clock, but in general that holds for only an infinitesimal duration for each inertial clock and one needs a succession of such inertial frames). It says nothing at all about how to synchronize _multiple_ clocks, which is the issue I addressed in the measurement technique I described.

Taylor and Wheeler address this issue in their book "Exploring Black Holes",
pg. 3-16. The situation in that section is the same as in my section 2. They
say: "A stone falling radially from rest at infinity [toward a black hole]
has speed dr_shell / dt_shell as measured by observers on shells [at each
altitude] through which the stone plunges". They don't mention your
measurement technique.

They have "eq. [23]" (see definitions in my paper): dt_shell = sqrt(1 - (R /
r)) * dt

A reader asks:

"... Let a firecracker explode at each shell as the stone passes. Clocks on
these different shells "run at different rates" according to that very
equation [23]. How can you possibly combine readings from these two
different-rate clocks to meter the shell time the stone takes between the
two flash emissions?"

Taylor and Wheeler reply:

"... When we measure velocity, however, we employ calculus in the
conventional sense of a limiting process, with dr and dt and dr_shell and
dt_shell all tending to zero. Then the firecrackers go off right next to
each other; the two clocks are-in the limit-on the same shell, so they run
at the same rate at this limit."

 Quote: For the case at hand, any non-infinitesimal distance matters, and a system at rest relative to the black hole having a finite separation of clocks is not a MCIF.

As noted above, the separation is zero in the limit. So your measurement
technique isn't needed.

 Quote: But the particle can be the measurer. That is plain and simply not true. The measurement of an object's speed must be relative to a system of coordinates, and the particle itself cannot do that, it requires assistants at rest in the coordinate system having clocks synchronized in the coordinate system and rulers of the coordinate system.

Given the above, it should now be intuitively clear that the particle can be
the measurer.

Within the particle's frame your requirements can be met. The separation
between "assistants at rest in the coordinate system" can be zero in the
limit, so the particle can be infinitesimally small. The particle measures
the velocity of a shell observer as it passes by.
Google

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