I Does Space-Time Exist Without Energy?

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If there was no mass/energy would space time still exist? In other words, does on space time only exist because of an interaction between two points of energy?
 
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A spacetime without mass or energy is the one described by special relativity.

Whether such a thing could exist or not (as a real thing rather than a useful approximation) is unverifiable, since we aren't in such a spacetime and have no access to any other, even if they exist. That means it's outside the realm of science, at least at our current level of understanding.
 
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I think a better question is "could there be spacetime w/o energy". The answer is yes according to the field equations. Now, the same is true for EM in that electromagnetic fields can exist without charges but it's less clear they would exist if there were no charges. I guess my point is that the field equations need to be supplemented with reasonable and consistent boundary conditions.
 
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Thread 'Can this experiment break Lorentz symmetry?'

Thread 'Can this experiment break Lorentz symmetry?'

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Does the speed of light change in a gravitational field depending on whether the direction of travel is parallel to the field, or perpendicular to the field? And is it the same in both directions at each orientation? This question could be answered experimentally to some degree of accuracy. Experiment design: Place two identical clocks A and B on the circumference of a wheel at opposite ends of the diameter of length L. The wheel is positioned upright, i.e., perpendicular to the ground...
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Thread 'How can a black hole absorb matter?'

According to the General Theory of Relativity, time does not pass on a black hole, which means that processes they don't work either. As the object becomes heavier, the speed of matter falling on it for an observer on Earth will first increase, and then slow down, due to the effect of time dilation. And then it will stop altogether. As a result, we will not get a black hole, since the critical mass will not be reached. Although the object will continue to attract matter, it will not be a...
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