| Topic: |
Science > Physics |
| User: |
"Mike Jr." |
| Date: |
24 Mar 2006 09:39:21 PM |
| Object: |
Towards a new test of general relativity? |
"Scientists funded by the European Space Agency have measured the
gravitational equivalent of a magnetic field for the first time in a
laboratory. Under certain special conditions the effect is much larger
than expected from general relativity and could help physicists to make
a significant step towards the long-sought-after quantum theory of
gravity."
http://www.physorg.com/news12054.html
--Mike Jr.
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| User: "LawsonE" |
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| Title: Re: Towards a new test of general relativity? |
26 Mar 2006 12:21:23 AM |
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"Mike Jr." <n00spam@comcast.net> wrote in message
news:1143257961.475707.161010@u72g2000cwu.googlegroups.com...
"Scientists funded by the European Space Agency have measured the
gravitational equivalent of a magnetic field for the first time in a
laboratory. Under certain special conditions the effect is much larger
than expected from general relativity and could help physicists to make
a significant step towards the long-sought-after quantum theory of
gravity."
http://www.physorg.com/news12054.html
--Mike Jr.
Here's a question: black holes can have spin and charge as well as mass. A
spinning charged black hole should have a magnetic field so...
Is it possible for the aforementioned gravitomagnetic field to be larger
than the mass-gravitational field of a black hole for certain values of
charge, spin and mass?
Sounds kind of wierd, but in my limited understanding of this stuff, the
charge of the black hole could be immensely larger compared to the mass, and
if spinning fast enough, the magnetic field would be huge. Could the
gyroscopic effect combined with the electromagnetic effect become large
enough for the magnetogravitic effect to swamp the mass effect? My intution,
for what its worth, says yes it could, but I don't have the math to work
with the formulas.
Comments?
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| User: "" |
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| Title: Re: Towards a new test of general relativity? |
26 Mar 2006 12:43:14 AM |
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Comments?
Actually, I've been wondering if the 'dark matter' effect (and possibly
even the 'dark energy' effect) can be explained by gravitomagnetism.
To me, dark matter and dark energy are simply ad hoc explanations to
try to explain a theory that will soon be discarded into the 'classic
physics' pile.
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| User: "LawsonE" |
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| Title: Re: Towards a new test of general relativity? |
26 Mar 2006 03:05:07 AM |
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<Starbles@Earthlink.net> wrote in message
news:1143355394.631556.222310@t31g2000cwb.googlegroups.com...
Comments?
Actually, I've been wondering if the 'dark matter' effect (and possibly
even the 'dark energy' effect) can be explained by gravitomagnetism.
Had occured to me also, but some are suggesting that the study is likely
seriously flawed and will be discredited.
To me, dark matter and dark energy are simply ad hoc explanations to
try to explain a theory that will soon be discarded into the 'classic
physics' pile.
All theories are "ad hoc."
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| User: "Mike Jr." |
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| Title: Re: Towards a new test of general relativity? |
26 Mar 2006 06:10:56 AM |
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Mike Jr. wrote:
"Scientists funded by the European Space Agency have measured the
gravitational equivalent of a magnetic field for the first time in a
laboratory. Under certain special conditions the effect is much larger
than expected from general relativity and could help physicists to make
a significant step towards the long-sought-after quantum theory of
gravity."
http://www.physorg.com/news12054.html
--Mike Jr.
If you want more, try the following:
http://arxiv.org/ftp/gr-qc/papers/0603/0603033.pdf
"It is well known that a rotating superconductor produces a magnetic
field
proportional to its angular velocity. The authors conjectured earlier,
that in
addition to this so-called London moment, also a large gravitomagnetic
field
should appear to explain an apparent mass increase of Niobium
Cooper-pairs.
This phenomenon was indeed observed and induced acceleration fields
outside
the superconductor in the order of about 100 =B5g were found. The field
appears
to be directly proportional to the applied angular acceleration of the
superconductor following our theoretical motivations. If confirmed, a
gravitomagnetic field of measurable magnitude was produced for the
first time
in a laboratory environment. These results may open up a new
experimental
window on testing general relativity and its consequences using
coherent
matter."
and
http://arxiv.org/ftp/gr-qc/papers/0603/0603032.pdf
"Abstract
We show that non-zero masses for a spin-1 graviton (called graviphoton)
leads to
considerable gravitomagnetic fields around rotating mass densities,
which are not
observed. The solution to the problem is found by an equivalent
graviphoton mass
which depends on the local mass density to ensure the principle of
equivalence. This
solution, derived from Einstein-Proca equations, has important
consequences such
as a correction term for the Cooper-pair mass anomaly reported by Tate
among
many others. Similar results were obtained for the photon mass which is
then
proportional to the charge density in matter. For the case of coherent
matter the
predicted effects have been experimentally observed by the authors."
--Best regards,
--Mike Ramsey
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| User: "Peter" |
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| Title: Re: Towards a new test of general relativity? |
25 Mar 2006 01:59:15 AM |
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On 24 Mar 2006 19:39:21 -0800, "Mike Jr." <n00spam@comcast.net> wrote:
"Scientists funded by the European Space Agency have measured the
gravitational equivalent of a magnetic field for the first time in a
laboratory. Under certain special conditions the effect is much larger
than expected from general relativity and could help physicists to make
a significant step towards the long-sought-after quantum theory of
gravity."
http://www.physorg.com/news12054.html
Cf
http://www.scieng.flinders.edu.au/cpes/people/cahill_r/processphysics.html
<snip>
A new theory of gravity predicts, however, a second and much larger
`frame-dragging' or vorticity induced spin precession.
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