**Lorentz Covariant Models**

Henri PoincarĂ© argued in 1904 that a propagation speed of gravity which is greater than *c* would contradict the concept of local time (based on synchronization by light signals) and the principle of relativity. He wrote:

However, in 1905 PoincarĂ© calculated that changes in the gravitational field can propagate with the speed of light if it is presupposed that such a theory is based on the Lorentz transformation. He wrote:

Laplace showed in effect that the propagation is either instantaneous or much faster than that of light. However, Laplace examined the hypothesis of finite propagation velocity ceteris non mutatis; here, on the contrary, this hypothesis is conjoined with many others, and it may be that between them a more or less perfect compensation takes place. The application of the Lorentz transformation has already provided us with numerous examples of this.Similar models were also proposed by Hermann Minkowski (1907) and Arnold Sommerfeld (1910). However, those attempts were quickly superseded by Einstein's theory of general relativity.

Read more about this topic: Speed Of Gravity

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