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Frame Dragging


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To quote Wiki:

Albert Einstein's theory of general relativity predicts that rotating bodies drag spacetime around themselves in a phenomenon referred to as frame-dragging. The rotational frame-dragging effect was first derived from the theory of general relativity in 1918 by the Austrian physicists Joseph Lense and Hans Thirring, and is also known as the Lense-Thirring effect.[1][2][3] Lense and Thirring predicted that the rotation of an object would alter space and time, dragging a nearby object out of position compared to the predictions of Newtonian physics. The predicted effect is incredibly small — about one part in a few trillion. In order to detect it, it is necessary to look at a very massive object, or build an instrument that is incredibly sensitive. More generally, the subject of field effects caused by moving matter is known as gravitomagnetism.

 

Different forms of:

Rotational frame-dragging (the Lense-Thirring effect) appears in the general principle of relativity and similar theories in the vicinity of rotating massive objects. Under the Lense-Thirring effect, the frame of reference in which a clock ticks the fastest is one which is rotating around the object as viewed by a distant observer. This also means that light traveling in the direction of rotation of the object will move around the object faster than light moving against the rotation as seen by a distant observer. It is now the best-known effect, partly thanks to the Gravity Probe B experiment.

 

Linear frame dragging is the similarly inevitable result of the general principle of relativity, applied to linear momentum. Although it arguably has equal theoretical legitimacy to the "rotational" effect, the difficulty of obtaining an experimental verification of the effect means that it receives much less discussion and is often omitted from articles on frame-dragging (but see Einstein, 1921).[4]

 

Static mass increase is a third effect noted by Einstein in the same paper.[5] The effect is an increase in inertia of a body when other masses are placed nearby. While not strictly a frame dragging effect (the term frame dragging is not used by Einstein), it is demonstrated by Einstein to derive from the same equation of general relativity. Again, a tiny effect difficult to confirm experimentally.

 

Ok, so my question is whether this effect occurs on a planetary surface as well? What about underground? There is a Gravity Probe experiment underway which involves the launching of satellites into orbit in order to measure the tiny effect with the use of gyroscopes, but this will only measure the effect in near space and not on the surface or underground.

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yes it does occur at groundlevel. the problem with conducting the experiment at ground level is that you can't make a sensitive enough gyroscope without adding in systems that will add error. basically any result you got would have horrible error levels. in microgravity suddenly you can get the errors smaller than the values you are trying to measure.

 

it actually works out cheaper to send up a satellite than build something that has to cope with the vibrations and changing feilds of earth.

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I was wondering how the effect changes in strength as you move through the atmospheer and onto the surface? You see, I always thought that the measured effect would lessen as you come closer to the surface, because you would be entering the inertial frame of the earth. But then if that were the case, that would mean that the frame of the earth is isolated from the surrounding space to some degree, no?

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  • 9 years later...

I believe there is no frame-dragging effect of gravity on mass, only on electromagnetic energy!

Curiously, the Lense-Thirring effect in Gravity Probe B has the same value than the geodetic effect of the Earth around the Sun.

Kinetic energy of a rotating body like Earth will increase gravity but more in the sense of classical force than classical aether!

An interesting experiment!

Understanding Gravity Probe-B experiment without math

Edited by Jose50
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!

Moderator Note

I believe you have warned before on posting your personal theories in mainstream physics. Not to mention in effect thread hijacking. Though this is an extremely old thread. Please reread the modnote of your previous offense.



http://www.scienceforums.net/topic/106230-can-a-black-hole-with-a-high-spin-rate-drag-space-around/?fromsearch=1 Edited by Mordred
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