
	Where results make sense

Topic: Gravitomagnetism

In the News (Sat 26 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	What is Gravitomagnetism?
		Gravitomagnetism, a theoretical idea around since 1918, is a predicted consequence of general relativity, from which it was derived.
		But it is called gravitomagnetism because of the mathematical similarity between the equations that describe this effect and the creation of a magnetic field.
		A difficulty in measuring gravitomagnetism is that the earth's equatorial bulge creates discrepancies in satellite/gyroscope behavior that must be correctly subtracted from other data in order to measure the magnitude of genuine frame-dragging.
	www.wisegeek.com /what-is-gravitomagnetism.htm (671 words)

	In Search of Gravitomagnetism
		Gravitomagnetism is produced by stars and planets when they spin.
		If Einstein's equations are correct and gravitomagnetism is real, the spinning gyroscopes should wobble as they orbit the earth.
		But gravitomagnetism could be powerful in other parts of the Universe--for instance, "near a spinning fl hole or a neutron star," says Will.
	science.nasa.gov /headlines/y2004/19apr_gravitomagnetism.htm (1275 words)

	SciForums.com - Earths Orbit
		Gravitomagnetism is a very well know and recognized analogy to describe the gravitational equivalent of a charge in motion, which has a magnetic moment.
		It is the effect seen by an observer due to mass in relative motion (one type of gravitomagnetism is called frame dragging).
		Gravitomagnetism has nothing to do with electromagnetism, or magnetism.It is the effect seen by an observer due to mass in relative motion (one type of gravitomagnetism is called frame dragging).
	www.sciforums.com /printthread.php?t=32085 (1083 words)

	Gravitomagnetism - Wikipedia, the free encyclopedia
		Gravitomagnetism (sometimes Gravitoelectromagnetism, abbreviated GEM), refers to a set of formal analogies between Maxwell's field equations and an approximation to the Einstein field equations for general relativity, valid under certain conditions.
		The factors 2 and 1/2 arise because the effective gravitomagnetic charge is twice the static gravitational (gravitoelectric) charge, a remnant of the spin-2 character of the gravitational field.
		Gravitomagnetic arguments also predict that a flexible or fluid toroidal mass undergoing minor axis rotation ("smoke ring" rotation) will tend to pull matter preferentially in through one throat and expel it from the other (a case of rotational frame dragging, acting through the throat).
	en.wikipedia.org /wiki/Gravitomagnetism (1253 words)

	Linking Gravitomagnetism to Infrasound
		Gravitomagnetism would then be created from the Earth traveling through the gravitational pull of the Sun as well as gravitational affect from the other planets.
		The explanation given is that the pounding on the iron aligned the magnetic moment of the atoms in the iron to the Earth's magnetic field and rapid cooling froze this pattern in the material.
		That is, calculate the solar system's gravitomagnetic field, then calculate the gravitomagnetic acceleration on the probe, and show that is equal to the observed value.
	forum.physorg.com /Linking-Gravitomagnetism-to-Infrasound_1764.html (14814 words)

	SciForums.com - Gravitomagnetics
		As the planet orbits the Sun, that gravitomagnetic field generates a gravitational field either towards the Sun, or away from the Sun, depending on the direction of the rotation of the planet.
		Gravitomagnetism is the subject of a satelite experiment, Gravity B, which is scheduled to be reported in a few months.
		Gravitomagnetism is a slightly misleading terminology because it is not magnetism like refrigerator magnets and such like.
	www.sciforums.com /printthread.php?t=50598 (2732 words)

	The Nature of Gravitomagnetism
		So why is gravitomagnetism, and its after affect, frame dragging so important for theorist, for one in provides another test to check the validity of GR so that we may learn more about the nature of the universe around us.
		Gravitomagnetism may also give clues as to various other possible behavior which matter and energy may take which are not known to present science.
		It also may not be unreasonable to wage that gravitomagnetism may give some insight into the abundant nature of Dark Energy reported by cosmologist across the larger scale universe and why it appears to be practically non existent on Earth.
	members.tripod.com /da_theoretical1/gravitob.html (1145 words)

	gravitomagnetism, electromagnetism, magnetism, field, electric, unification, unified, relativity, string, theory, ...
		Gravitomagnetism explains the 8 cosmological blunders of the last 85 years, it gives the new Newton law, it defines gravitational waves radiation, it explains the fl hole thermodynamics and the light dynamics thru 100 pages of PDF format.
		It is the only complete gravitomagnetism paper in the world that has become a reference to most of the research centers.
		A central concept in science and the scientific method is that all evidence must be empirical, or empirically based, that is, dependent on evidence that is observable by the senses.
	blackholethermodyn.site.voila.fr /enter.html (540 words)

	Gravitomagnetism
		Since all laws have to be lorentz invariant, all 1/r^2 laws must be accompanied by a velocity-dependent field (the magnetic field for electromagnetism and the gravitomagnetic field for gravity).
		"Gravitomagnetism (sometimes Gravitoelectromagnetism), abbreviated GEM, refers to a set of formal analogies between Maxwell's field equations and an approximate reformulation of the Einstein field equations for general relativity, valid under certain conditions.
		both the electromagnetic and gravitomagnetic forces are pseudo-forces to account (without reference to SR) for an observed reduction in electrostatic or gravitostatic forces.
	www.physicsforums.com /showthread.php?t=98613 (2349 words)

	Physicist disputes speed of gravity claim
		It is analogous to the magnetic field generated by an electric current moving through a wire, though the objects it attracts do not have to contain iron.
		Gravitomagnetism is very difficult to detect because it is an extremely weak force.
		If the axes of the gyroscopes stray while the probe is in space, gravitomagnetism will be the most probable cause.
	news-info.wustl.edu /tips/page/normal/119.html (517 words)

	Posts tagged with gravitomagnetism \| MetaFilter
		An experiment recently performed by the AET RaDAL group shows that the gravitomagnetic field produced by a rapidly-spinning superconductor can cause a 1.117 times increase over the Earth's gravity.
		Gravitomagnetism, a phenomenon predicted by General Relativity, is a poorly understood but promising topic in modern physics.
		Reactionless space propulsion [PDF] is the most apparent use (previously discussed), with the potential applications far-reaching and nearly inconcievable.
	www.metafilter.com /tags/gravitomagnetism (133 words)

	Not PC: Gravity research offers science fiction results
		One of the 'last unknowns' for science is an understanding of gravity sufficient to put that understanding to technological use.
		Research by Austrian scientists has suggested the phenomenon of gravitomagnetism may have more importance than was previously predicted, and it not only calls into question what was previously thought about gravity.
		Let your imagination run riot: a gravitomagnetic device that works by changing the acceleration and orientation of a superconductor would be the basis for a general-purpose force field.
	pc.blogspot.com /2006/11/gravity-research-offers-science.html (1437 words)

	The Search for Frame-Dragging
		Gravitomagnetism has a history that is at least as long as that of general relativity itself.
		Soon after the publication of general relativity (GR), Lense and Thirring calculated the advance of the pericenter and line of nodes of a particle orbiting a rotating mass.
		The gravitomagnetic ``dragging of inertial frames'' by rotating matter has played a part in discussions about the meaning and usefulness of Mach's principle, in astrophysical models of jets near accreting, rotating fl holes, and in proposals for testing alternative theories of gravity.
	www.phys.lsu.edu /mog/mog10/node9.html (1016 words)

	3.7 Other tests of post-Newtonian gravity
		According to GR, moving or rotating matter should produce a contribution to the gravitational field that is the analogue of the magnetic field of a moving charge or a magnetic dipole.
		Although gravitomagnetism plays a role in a variety of measured relativistic effects, it has not been seen to date, isolated from other post-Newtonian effects (for a discussion of the evidence for gravitomagnetism in solar system measurements and the binary pulsar, see [100, 99]).
		Another proposal to look for an effect of gravitomagnetism is to measure the relative precession of the line of nodes of a pair of laser-ranged geodynamics satellites (LAGEOS), ideally with supplementary inclination angles; the inclinations must be supplementary in order to cancel the dominant nodal precession caused by the Earth's Newtonian gravitational multipole moments.
	relativity.livingreviews.org /Articles/lrr-2001-4/node13.html (1150 words)

	Christoph Schmid : Cosmological Vorticity Perturbations, Gravitomagnetism, and Mach's Principle (Site not responding. Last check: 2007-11-03)
		We write the laws of gravitomagnetism in a form showing clearly the close correspondence with Ampere's law of ordinary magnetism.
		For the special case of a homogeneous rotation of cosmological matter inside a given perturbation radius, the dragging of the axis of a gyroscope at the center approaches exact dragging exponentially fast as the perturbation radius increases beyond the Hubble-dot radius.
		For a general vorticity perturbation a gyroscope axis exactly follows the (dr/r)-average of the gravitomagnetic moments of the energy current of cosmological matter with the exponential cutoff at the Hubble-dot radius.
	cfa-www.harvard.edu /tad/events/2002-2003/s_abstracts/3.html (204 words)

	DocBug: European Space Agency measures gravitomagnetism (Site not responding. Last check: 2007-11-03)
		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.
		Small acceleration sensors placed at different locations close to the spinning superconductor, which has to be accelerated for the effect to be noticeable, recorded an acceleration field outside the superconductor that appears to be produced by gravitomagnetism.
		It demonstrates that a superconductive gyroscope is capable of generating a powerful gravitomagnetic field, and is therefore the gravitational counterpart of the magnetic coil.
	docbug.com /blog/archives/000565.html (396 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		Scientists call it "gravitomagnetism." Gravitomagnetism is to gravity as magnetism is to electricity.
		Finding gravitomagnetism by examining the orbits of satellites is difficult, says Will, because other forces--like the pull of Earth's equatorial bulge--can precess the orbits of satellites billions of times more than gravitomagnetism does.
		This effect of the gravitomagnetic field is often referred to a s "frame dragging," or the Lense-Thirring effect.
	spacescience.com /headlines/y2004/images/gpb/story.doc (1465 words)

	ESA Portal - Towards a new test of general relativity?
		They have discovered that this anomaly could be explained by the appearance of a gravitomagnetic field in the spinning superconductor (This effect has been named the Gravitomagnetic London Moment by analogy with its magnetic counterpart).
		Now we are confident about the measurement," says Tajmar, who performed the experiments and hopes that other physicists will conduct their own versions of the experiment in order to verify the findings and rule out a facility induced effect.
		The electromagnetic properties of superconductors are explained in quantum theory by assuming that force-carrying particles, known as photons, gain mass.
	www.esa.int /esaCP/SEM0L6OVGJE_index_0.html (607 words)

	22 over 7 = [aspects + concepts of matter + energy / form flame light space image + imagination]
		Gravity Probe B (I have to assume there was an A) is in orbit around Earth to detect the effects of a force called gravitomagnetism.
		Einstein [told] us that all gravitational forces correspond to a bending of spacetime; the "twist" is gravitomagnetism."
		Anyhow, I only found out about GP B because of a blip about it on Spaceweather.
	nmazca.com /3142857/2005/01/gravity-probe-hit-upside-head-by-solar.htm (271 words)

	In Search of Gravitomagnetism
		NASA's Gravity Probe B spacecraft left Earth Tuesday in search of a force of nature, long suspected but never proven: gravitomagnetism.
		For their study, they used the Laser Geodynamic Satellites, LAGEOS & LAGEOS II, two 60 cm diameter balls studded with mirrors.
		They invented and proved the concept of a drag-free satellite, and most recently some members of the group have pioneered differential use of the Global Positioning System (GPS) to create a highly reliable and precise aircraft landing system."
	www.spacedaily.com /news/gravity-04h.html (962 words)

	Gravitomagnetism (via CobWeb/3.1 planetlab2.cs.umd.edu) (Site not responding. Last check: 2007-11-03)
		Once we better understand gravitomagnetism will we be able to construct a proper GUT.
		The eventual questions concerning AWT directly should be addressed into this forum topic.
		I wrote an exposé about gravitomagnetism, I solved the pioneer anomaly and also other 5 cosmological blunders of the last 85 years, see the summary page 8, new Newton law page 1, www.gravitomagnetism.com
	lofi.forum.physorg.com.cob-web.org:8888 /Gravitomagnetism_7069.html (433 words)

	Random Developments » The Pioneer Anomaly
		Was the constant of cosmology the only blunder that Einstein has ever had in his search for gravitomagnetism or is it an iceberg of the biggest blunder on Einstein equation of gravity?
		How does it come that the old guards of relativity have not yet presented a global, coherent and falsifiable gravitomagnetism theory and at the same time continue considering themselves as experts in relativity?
		The old guards are spending huge amounts of tax payers’ money, do they know what they are looking for or are they just speculating on what might be measured?
	www.netwhatever.com /randomdev/2005/09/27/the-pioneer-anomaly (919 words)

	Einstein and Cosmology by A.K. Lal (Site not responding. Last check: 2007-11-03)
		space and time around it, and how it drags space and time as it rotates - the phenomenon better known as 'gravitomagnetism'.
		Eventual observation of gravitomagnetism will undoubtedly reassure scientists' faith in the validity of the general theory of relativity which is also the modern theory of gravitation.
		The validity of general theory is of great relevance in the study of the cosmos as well.
	www.ufoindia.org /article_einstein.htm (440 words)

	Description of a High-Accuracy Frame-Dragging Experiment Using an Unsupported Gyroscope in a Drag-Free Satellite (Site not responding. Last check: 2007-11-03)
		The PDF papers on this page may be downloaded directly from this website with the Adobe Acrobat Reader.
		Frame-Dragging, also known as the Lense-Thirring effect or gravitomagnetism, is the gravitational analog of magnetism.
		It says that the gravitational field of a spinning body is different from the gravitational field of a non-spinning body, or more generally there is an additional interaction between two bodies in relative motion beyond the interaction when the two bodies have zero relative motion.
	www.dragfreesatellite.com /MG8_fd.html (299 words)

	Speed of Gravity
		Gravitomagnetism and the Speed of Gravity, S. Kopeikin, Int.
		Gravitomagnetism and the Aberration of Gravity in the Gravitational Light-Ray Deflection Experiments, S. Kopeikin and E. Fomalont (gr-qc/0510077)
		Note on the relationship between the speed of light and gravity in the bi-metric theory of gravity, S.
	wugrav.wustl.edu /people/CMW/SpeedofGravity.html (936 words)

	REFERENCE FRAMES AND GRAVITOMAGNETISM
		This book provides an authoritative overview of the developments in gravitomagnetism which have taken place in the last few years.
		In particular, experiments for measuring the Lense—Thirring effect with satellites orbiting the Earth are reviewed, and an updated list of references on gravitomagnetism is included.
		The book also presents diverse research in general relativity and cosmology.
	www.worldscibooks.com /physics/4710.html (205 words)

Try your search on: Qwika (all wikis)