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Questions tagged [frame-dragging]

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Will the spacetime around a rotating spherical massive body change in time or not?

The spacetime around a rotating massive body is distorted (in addition to the distortion caused by the body's gravity) by frame dragging. My question is simple. Is this distortion around a massive ...
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0answers
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Does the frame dragging Schiff Equation imply opposite directions of spin over the pole compared to the equator?

In reviewing the answers to Schiff Equation in a polar orbit, I see that the Schiff Equation for rotation about the z-axis (north-south pole axis) can be written as: This is integrated to give an ...
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1answer
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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. ...
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1answer
75 views

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 ...
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1answer
48 views

Spacetime drag and galaxies' radial velocity mismatch

We know - or theorize - that a spinning black hole drags spacetime in its surroundings, producing measurable effects on the accretion disk (the minimum stable orbit radius). What I cannot grasp is why ...
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0answers
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How much heat energy is generated by the Sun and Moon's gravitational action on the Earth?

How much heat energy is generated by the Sun and Moon's gravitational action on the Earth? It would seem fairly obvious that any spinning body orbiting a massive object will convert its own motion ...
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1answer
25 views

Does mass have a larger frame dragging effect than energy?

A rotating mass will twist spacetime and cause orbiting bodies to precess. My question is whether the mass of the rotating body itself plays a bigger role in the dragging effect than energy and how ...
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1answer
71 views

Does Frame Dragging exert a force?

Can a planet in a stable clockwise orbit slow down into a spiral if orbiting a black hole spinning counter-clockwise?
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What does that mean, a black hole “rotates”? [duplicate]

A black hole has: a mass electrical charge angular momentum? In the inner, there is a singularity, all the mass, collapsed to one point. The event horizon is surrounding that singularity. How can a ...
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0answers
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Effects on Niven Ring Around Kerr Black Hole

Suppose I have a Kerr black hole (rotating, uncharged) and I build a giant ring (a "Niven Ring") around it. I am interested in two related scenarios (I am confused about the second, but am also ...
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1answer
59 views

Frame Dragging by Sag A star

Is frame dragging by the supermassive black hole Sag A responsible for the milky way's rotation? If so would we also be part of time dilation depending on how close we are to Sag A? Is the gravity ...
3
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1answer
171 views

Why Does Spinning Mass Twist Spacetime

Massive spinning objects (such as Kerr black holes) 'twist' spacetime around them, as predicted by Einstein's theory of general relativity. Can someone explain qualitatively why this happens? Is there ...
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1answer
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Atom interferometry,gravity and inertia: What can it measure that light interferometry can't? [closed]

What previously unexplored effects in gravity and inertia can be examined with atom interferometry in ways that hasn't already been done through light interferometry? Can atom interferometry be used ...
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2answers
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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 ...
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2answers
106 views

Do light experience Doppler shift along and against frame dragging?

Imagine 2 photons traveling along the equator in opposite directions, of course I'm not suggesting light goes into orbit I'm just wandering if these photons will be blue and red shifted ever so ...
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1answer
48 views

Can GR effects be verified or measured with balance beam experiment?

I have a question about a gravitational thought experiment. In relation to GR there is some attention paid to the torque exerted on the local space by a spinning mass, although I think only a sphere ...
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3answers
283 views

The physical meaning of the cross-term of Kerr metric

I have been experimenting with different types of metric tensors in General Relativity. I decided to try my hand with the Kerr Metric. When I did, I found an odd term in it: namely, a cross product of ...
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1answer
110 views

Does Earth-spin affect the retrograde orbital motion of artificial satellites?

If frame-dragging is true then how the retrograde satellites orbit in the opposite direction to the earth spin direction?
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1answer
152 views

Geometry of the curvature of spacetime around rotating or spinning revolving objects

What is the geometry of the curvature of spacetime around rotating or spinning revolving objects, or anything that has an angular momentum?
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1answer
101 views

A question about framedragging

Is the spacetime curvature caused by gravito-magnetism constant, or does it change over time, like winding up a spring? I mean, if a heavy spinning mass, for example a neutron star (or the earth, for ...
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1answer
47 views

Forces on a rotating black hole

Could a rotating black hole experience Magnus type forces in the vicinity of a super-massive black-hole (non-rotating)? If it were falling towards the super-massive black-hole would it begin to ...
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2answers
234 views

Is frame drag the magnetic part of gravity? [closed]

Like moving charged mass creates an magnetic field, does moving mass also creates a magnetic field associated with moving (accelerated) mass? And if so, why does the mass have to accelerate, while in ...
2
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0answers
280 views

Frame dragging VS Mach's principle: rotating body in an empty universe

What I understand about Mach's principle VS modern physics: According to classical physics, there are ways to distinguish weather a body is rotating or not. For example if it is rotating, the ...
4
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1answer
89 views

Frame dragging resulting in an orbital plane?

In astrophysics today we talked about spinning black holes, ring singularities, and frame dragging. Is this also (to some degree) the cause of the milky way being as flat as it is? Does the spin of ...
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1answer
936 views

Why do planetary all rings seem to be on the equatorial plane?

Why do planetary all rings seem to be on the equatorial plane? When I first saw a picture of Uranus and its rings, I was surprised by their inclination, 90 degrees from the axis of rotation. This ...
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2answers
492 views

Does a spinning mass follow a straight trajectory in empty space? Or is it curved like a golf ball?

Suppose that we can send to identical satellites (like Voyager 1&2) on identical trajectories. But one spins to the right while the other spins to the left. Would they follow the same trajectory?...
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2answers
635 views

Is there a doppler effect on the images of stars around rotating black holes?

I'm an illustrator working on a project involving rotating black holes like those discussed in "Gravitational Lensing by Spinning Black Holes in Astrophysics, and in the Movie Interstellar" by James, ...
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1answer
533 views

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 ...
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1answer
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Frame-dragging (conservation of angular momentum)

The frame-dragging-effect implies the rotation (in the direction of black hole angular momentum) of every object in the ergosphere. But what about the conservation of angular momentum if the object ...
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0answers
162 views

Is there an absolute accelerated frame of reference?

I know from special relativity and from a little common sense that there is no absolute inertial frame of reference; that is, physics acts the same no matter what velocity you go at. However, that ...
3
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1answer
235 views

Do two bodies spinning about the same axis in the opposite direction repel each other?

I recently read about the GEM equations, which look very much like the Maxwell's equations. Does this mean the behavior of mass is like the the behavior of the electric charge? So for example if you ...
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3answers
2k views

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 ...
2
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0answers
160 views

Forward's frame-dragging accelerator

On 1962, Robert Forward studied the possibility of using General Relativity Frame-Dragging effects to accelerate probes inertially (that is, without feeling any internal G-forces) One of the ideas is ...
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2answers
455 views

Frame dragging around a black hole

If you have one stationary non-rotating black hole, being orbited by a 2 or more black holes just outside each other's event horizons does this alter the size of the central black hole's event horizon?...