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- W2005464051 abstract "Our physical intuition usually separates space from time, ignoring the spacetime character of the physical reality. In strongly curved spacetimes this may lead to confusion and paradoxes. I present here two examples: (1) in the non-static cosmological spacetimes with flat space sections, the cosmological expansion of space is a true physical effect. Contrary to what the intuition imagines, it cannot be explained as a motion of matter in a non-expanding flat space. (2) Contrary to intuition, for static spacetimes the mathematically simplest 3+1 split is not given by the direct projection as in the standard ADM scheme. The simplest split is defined by a counter intuitive “optical geometry” that redshifts both space and time by the same conformal factor." @default.
- W2005464051 created "2016-06-24" @default.
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- W2005464051 date "2008-05-01" @default.
- W2005464051 modified "2023-09-27" @default.
- W2005464051 title "Spacetime is not just space and time" @default.
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- W2005464051 doi "https://doi.org/10.1016/j.newar.2008.03.027" @default.
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