Achronal vs. Spacetime

Achronal vs. Spacetime — Is There a Difference?
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Difference Between Achronal and Spacetime

Achronaladjective

(physics) Describing a set of points in a spacetime, no two of which have timelike separation

Spacetimenoun

The four-dimensional continuum of one temporal and three spatial coordinates in which any event or physical object is located.

Spacetimenoun

The four-dimensional continuum of the three spatial dimensions plus time. Category:en:Higher-dimensional geometry

An event is a point in spacetime, specified by the coordinates x, y, z, and t.

Spacetimenoun

(physics) An n-dimensional continuum consisting of dimensions of both space and time. Normally spacetime is considered as having 4 dimensions (x, y, z, t), but higher-dimensional spacetimes are often encountered in theoretical physics, e.g. the 5-dimensional spacetime of Kaluza-Klein theory or the 11 dimensions of spacetime in M-theory.

a Minkowski spacetimea 5-dimensional spacetime

Spacetimenoun

(relativity) A specific region of the universe with mathematically different properties than the surrounding spacetime. Synonymous with "metric" within the context of general relativity.

a Schwarzschild spacetimea Reissner-Nordström spacetime
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