Looking at the title of this blog, many of you must be wondering when the the physics will appear. I still do spend time on physics, but mostly wrestling with fundamental issues. For example: if, as Einstein indicates in his "Meaning of Relativity" and other writings, that spacetime is really the interval between events, what are the implications of this with regard to the propagation of fields? Does energy/matter curve spacetime, or actually create it it? Is this why spacetime is "denser" near masses?
Why the different signs for space and time; energy and momentum? What is the reason for the the imaginary component of spacetime? How does it relate to velocity vs displacement for rotating bodies?
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