Questions tagged [frame-dragging]
110 questions
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Has frame dragging been accounted for in galactic rotation curves?
This article explicitly takes frame dragging into account in calculating expected galactic rotation curves in the absence of dark matter, and appears to obtain very close matches to observed curves. Is it true that frame dragging is typically…
S. McGrew
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Is MTW's argument in favor of Mach's principle valid?
Looking at older books, I was surprised to see that the general relativity "bible" by Misner, Thorne, and Wheeler is very strongly in favor of Mach's principle, which is treated in section 21.12.
They begin by quickly dismissing an "enormous…
knzhou
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How does a rotating object cause frame dragging?
Frame dragging is a consequence of general relativity.
But I don't really understand it. Of course I can find metaphors like the "honey metaphor" where stirring a honey can move the specks even if the spoon doesn't touch them. But I'm not satisfied…
Calmarius
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Does the twist of spacetime by a black hole increase over time?
From the Wikipedia page about Ergospheres:
As a black hole rotates, it twists spacetime in the direction of the rotation...
Does this "twisting up spacetime" add up over time in any measurable way? Or do I take a metaphor too literal?
What I mean…
Brotcrunsher
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We know there is no aether, so what is being dragged in frame dragging?
I have read this question:
In stellar frame dragging what is the 'frame'?
There are several questions on this site about frame dragging, all of them take the frame that is being dragged as an axiom, they do not explain what is exactly being…
Árpád Szendrei
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Is this an actual photo of frame dragging?
Is this new image (below) of polarized light surrounding Sagittarius A, showing actual frame dragging being captured by the magnetic field? The image is from this article If not, how would a photo showing frame dragging in the magnetic field look…
foolishmuse
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Can a drop of water be set in rotational motion by rotating mass around it?
We are in empty space and see a spherical drop of water. Around the drop we have placed a massive shell with uniform density. The drop is positioned at the center. Then we set the shell in rotational motion (by small rockets on the side). Will the…
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Does frame dragging apply to linear motion?
Firstly I will admit I do not understand the real cause of rotational frame dragging and some of the math heavy explanations are too complicated for me. To me frame dragging looks like unsubstantiated analogy with friction. So in order to better…
daniel.sedlacek
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Is there linear 'frame dragging'?
Very massive objects cause the so called 'frame dragging' that can increase the speed of a beam of light to a total aggregate speed faster than the speed of light in normal circumstances so my question is: can a very massive fast object drag…
Janko Bradvica
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Gravitational lensing redshift around a Kerr black hole
Light from a source passes by a Kerr black hole on two sides at the equator and converges at the observer. The axis of rotation of the black hole is perpendicular to the direction of light. Two rays of light pass through the spacetime regions of a…
safesphere
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Can rotation be distinguished from frame-dragging?
I am trapped inside the usual elevator and experiencing a comfortable gravitational field of about 1 g. Or perhaps it's an acceleration of 1 g. I cannot tell which.
However, I notice when I drop an object from the ceiling it does not quite drop…
Roger Wood
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How can a black hole rotate if time dilation stops time at the event horizon?
How does a black hole rotate if time is dilated to infinity (e.g. stopped) at the event horizon? Note: this is relevant to this question, but different: How can a singularity in a black hole rotate if it's just a point?
Edit: I am considering this…
Jonathan
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Frame-dragging of a rotating doughnut
Gravitomagnetic arguments also predict that a flexible or fluid toroidal mass undergoing minor axis rotational acceleration (accelerating "smoke ring" rotation) will tend to pull matter through the throat (a case of rotational frame dragging,…
csha
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How is electromagnetic induction analogous to gravitational frame dragging?
This wiki says: https://en.wikipedia.org/wiki/Frame-dragging
Qualitatively, frame-dragging can be viewed as the gravitational
analog of electromagnetic induction.
I was wondering what exactly this means, and the wiki for electromagnetic induction…
Tristan
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Frame dragging Warp drive
Is it possible to use frame dragging to make a warp drive?
For example: a space ship with "frame dragging generators" that constructively interfere between them to let space be dragged in the desired direction of travel.
Of course we should have a…
Geert VS
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