Hey mates........^__^
answer this question.......
✔If gravity is not a force , but just deformation of space time caused by mass , why dose travel at the speed of light?
Answers
They are:
1 — is gravity a force?
2 — is gravity the “deformation" of space time? - aka - is gravity the “geometry” of space time?
3 — why does gravity travel at the speed of light?
Based on your question(s) you wish to understand gravity better. Welcome to the club, you are in good company.
In his usual eloquent way; Viktor T. Toth has explained this concisely, however, if you lack the technical acumen his persuasive arguments might go over your head.
Einstein's major break through was not in proving the speed of light, that was a consequence. He put forth a theory that said if our laws of physics hold true, they must hold true regardless of “frame of reference.” To achieve this there must be a maximum speed limit to the universe, an “invariant speed limit.” He then showed how the speed of light, in a vacuum, must propagate through space at this invariant speed limit. He devised some thought experiments. One was how would a beam of light look if it where to travel beside a train? How would the train look from the beam of lights perspective? From these experiments Einstien came to the conclusion that if the speed of light does not change, then the passage of time for the observer must change. This is his theory of “special relativity”
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Explanation:
Your question contains a very important insight, namely that gravitational waves propagate (in theory and consistent with experimental measurements thus far) at the same speed as electromagnetic waves. When two physical quantities have exactly the same value, there is almost certainly a logically compelling reason for it. For example, Einstein’s questioning of the equality of inertial and gravitational masses led to the General Theory of Relativity. More to the point, Maxwell identified light as an electromagnetic wave because of agreement between the two propagation speeds.
The simplest (and therefore most likely) reason that the two different types of waves have the same speed is that they represent similar disturbances of a common medium, which in this case is the vacuum.
If you model the vacuum as an elastic solid, then a gravitational wave would (approximately) distort a small circle in the plane perpendicular to the propagation direction into an ellipse with the same area (a “spin=2” disturbance with angular dependence of radial displacement proportional to [math]\cos{(2[\phi - \phi_0])[/math]). This relative elongation and shortening of perpendicular axes is what is detected by gravitational wave observatories.
In contrast, an electromagnetic wave would presumably move the circle back and forth (a “spin=1” disturbance with angular dependence of radial displacement proportional to [math]\cos{(\phi - \phi_0)[/math]).
Both types of disturbance are forms of incompressible shear waves, and propagate with the same speed. They differ only in their polarizations.
Early theories of light indeed described it as waves in an elastic solid. However, the modern theory of light has not been reconciled with this interpretation. So the above analysis should be viewed as an analogy rather than an explanation of the relationship between gravitational and electromagnetic waves.