Difference between revisions of "Category:Gravitoelectromagnetism (GEM)"
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The name is based on an analogy with '''electromagnetism (EM)''' – where the subject of EM deals (in part) with the effects due to a moving ''electrical'' charge, GEM effects are the analogous behaviours caused by a moving ''gravitational'' charge (a moving mass). | The name is based on an analogy with '''electromagnetism (EM)''' – where the subject of EM deals (in part) with the effects due to a moving ''electrical'' charge, GEM effects are the analogous behaviours caused by a moving ''gravitational'' charge (a moving mass). | ||
| − | The analogy is not exact (electrical charges can be positive or negative, gravitational charges can only be positive), but since both types of field are bound by the same general constraints of classical field theory, and both have a finite propagation speed (defined as "c" for EM, and generally assumed to nominally be "c" for GEM), the two classes of problem can't help but share some basic behaviours. | + | The analogy is not exact (electrical charges can be positive or negative, gravitational charges can only be positive), but since both types of field are bound by the same general constraints of classical field theory, and both have a finite propagation speed (defined as "<math>c</math>" for EM, and generally assumed to nominally be "<math>c</math>" for GEM), the two classes of problem can't help but share some basic behaviours. |
| − | == | + | ==Categories== |
| − | GEM effects cause a deflection of light | + | GEM effects cause a deflection of light and a deflection of the paths of objects passing through a region, and can be modelled as spacetime distortion effects, or as the result of nontraditional gravitational fields. |
| − | + | We can define three main classes of GEM effect: | |
| − | + | <ul> | |
| − | + | <li> '''Rotational GEM''' – creates a radial attraction at right angles to the rotation axis, and also a rotational dragging around the rotation axis, in the direction of rotation. <br> These two effects are "Machian", and appear in C20th GR. </li> | |
| + | <li> '''Accelerational GEM''' – creates a dragging effect around the accelerated body, in the direction of forced acceleration. <br> This effect is "Machian", and appears in C20th GR.</li> | ||
| + | <li style="color: darkred;"> '''Velocity-based GEM''' – creates a dragging effect around a moving body, in the direction of motion. <br> This effect is derivable from the rotational effect or from general gravitational arguments, but is at odds with special relativity. Its status under C20th GR is problematic.</li> | ||
| + | </ul> | ||
==Incompatibilities== | ==Incompatibilities== | ||
Revision as of 14:37, 11 July 2016
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Gravitoelectromagnetism (GEM) |
Gravitoelectromagnetism (GEM) is a rather long and unwieldy name for the effects on spacetime caused by moving masses.
Contents
EM vs GEM
The name is based on an analogy with electromagnetism (EM) – where the subject of EM deals (in part) with the effects due to a moving electrical charge, GEM effects are the analogous behaviours caused by a moving gravitational charge (a moving mass).
The analogy is not exact (electrical charges can be positive or negative, gravitational charges can only be positive), but since both types of field are bound by the same general constraints of classical field theory, and both have a finite propagation speed (defined as "[math]c[/math]" for EM, and generally assumed to nominally be "[math]c[/math]" for GEM), the two classes of problem can't help but share some basic behaviours.
Categories
GEM effects cause a deflection of light and a deflection of the paths of objects passing through a region, and can be modelled as spacetime distortion effects, or as the result of nontraditional gravitational fields.
We can define three main classes of GEM effect:
- Rotational GEM – creates a radial attraction at right angles to the rotation axis, and also a rotational dragging around the rotation axis, in the direction of rotation.
These two effects are "Machian", and appear in C20th GR. - Accelerational GEM – creates a dragging effect around the accelerated body, in the direction of forced acceleration.
This effect is "Machian", and appears in C20th GR. - Velocity-based GEM – creates a dragging effect around a moving body, in the direction of motion.
This effect is derivable from the rotational effect or from general gravitational arguments, but is at odds with special relativity. Its status under C20th GR is problematic.
Incompatibilities
An apparently overwhelming set of mutually-supporting arguments seem to insist that velocity-dependent GEM effects (GEM-v) must exist, and are required to exist by any credible general theory, by continuum theory, and by simple arguments based on projective geometry and domain translation. We can also extrapolate general GEM-v form the special-case velocity-dependent dragging effect around a moving body, posit GEM-v as being the lower-order effect underlying GR's GEM-a effect, and derive it from the stochastic approach to quantum mechanics, from particulate-matter draggign effects, or back-derive it from cosmological horizon behaviour.
On the other hand, if GEM-v effects exist, they lead to a chain or arguments that result in the invalidation of special relativity, which depends on our ability to model the physics of masses with simpel motion as probems involving perfectly flat spacetime. If GEM-v effects exist, then SR is not fundamental phyics, and our current general theory of reativity is wrong for including SR as a perfect physical limiting case.
Then again, GR1960 contains a mass on logical inconsistencies, no longer conforms with the GPoR disagrees with quantum theory and associated general geoemtrical and thermodynioc laws, and fails ot predict medium-scale gravity properly unless we invent dark matter, so perhaps the current general theory needs to be scrapped and rewritten anyway.
Full GEM as the basis of a new General Theory
If we attempt to construct a general theory that conforms to the GPoR even where this disagrees with SR, we obtain the full set of GEM effects, a relativistic acoustic metric rather than the flat Minkowski metric, and apparent agreement with QM.
Pages in category "Gravitoelectromagnetism (GEM)"
The following 6 pages are in this category, out of 6 total.
