Spacetime is an "immediate consequence" of Einstein's constant-speed-of-light postulate:

"Special relativity is based on the observation that the speed of light is always the same, independently of who measures it, or how fast the source of the light is moving with respect to the observer. Einstein demonstrated that as an immediate consequence, space and time can no longer be independent, but should rather be considered a new joint entity called "spacetime." http://community.bowdoin.edu/news/20...rs-of-gravity/

This means that, if the speed of light is variable, spacetime does not exist and neither do gravitational waves (ripples in spacetime). LIGO conspirators just fake them.

The speed of light is OBVIOUSLY variable:

Stationary light source, moving observer (receiver):

https://www.youtube.com/watch?v=bg7O4rtlwEE

https://www.einstein-online.info/wp-...ein-Online.gif

"By observing the two indicator lights, you can see for yourself that, once more, there is a blue-shift - the pulse frequency measured at the receiver is somewhat higher than the frequency with which the pulses are sent out. This time, the distances between subsequent pulses are not affected, but still there is a frequency shift." https://www.einstein-online.info/en/spotlight/doppler/

The speed of the light pulses as measured by the stationary source is

c = df

where d is the distance between the pulses and f is the frequency measured by the source. The speed of the pulses as measured by the moving observer is

c'= df' c

where f' f is the frequency measured by the moving observer.

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Pentcho Valev