The Substance of Spacetime
Ryan, Andrew Martin
Does Spacetime Exist?
If spacetime does not exist, it certainly does so in a curiously conspicuous way, not at all like other geometric abstractions. Consider this mindbender: spacetime does not exist at all, but it doesn't exist in the void even more than it doesn't exist in the universe. Is that the description of something that does not exist?
Relativity theory treats spacetime as a mathematical abstraction-a four-dimensional coordina...