Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective having the properties of
space - adjective physics (of the interval between two events in spacetime) lying outside each other's
light cone , so that noinformation can pass from one to the other - adjective mathematics (of a four-vector) having a space
component of greatermagnitude than itstime component multiplied by thespeed of light
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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The far future of our universe is therefore representable by de Sitter space-time, and in this type of space-time the future timelike boundary is a spacelike hypersurface.
Archive 2009-05-01 Gordon McCabe 2009
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(This 2D surface is at spacelike infinity on the Penrose diagram.)
Matthew Yglesias » Is The Universe a Hologram? Should We Care? 2010
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Now, in an open or flat Friedmann-Robertson-Walker cosmological model with no cosmological constant, whilst the past 'Big-Bang' singularity corresponds to a spacelike hypersurface in the boundary of the conformal compactification, the future timelike infinity corresponds to a single point.
Archive 2009-05-01 Gordon McCabe 2009
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Penrose made the simple observation that the future conformal boundary of such a space-time can therefore be joined to the spacelike initial conformal boundary of a Friedmann-Robertson-Walker model to make a cyclic universe.
Archive 2009-05-01 Gordon McCabe 2009
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The boundary of the conformal compactification contains components which correspond to singularities, and components which correspond to spacelike infinity, timelike infinity, (and null infinity).
Archive 2009-05-01 Gordon McCabe 2009
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The math is almost identical to my example, except that you get a timelike interval instead of a spacelike one.
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The math is almost identical to my example, except that you get a timelike interval instead of a spacelike one.
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However, there is no spacelike singularity we are headed towards — which is good.
Using Gravitational Lensing to Measure Age and Size of Universe | Universe Today 2010
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The result is a nonzero interval, spacelike for two photons emitted simultaneously from a source and timelike between different points on the worldline of a photon bouncing between mirrors.
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One of the reasons I have focused on the light code (null geodesic) in past discussions was from Prenrose statements like … "As far as I can make out, quanglement links are always constrained be the light cones, just as are ordinary information links, but quanglement links have the novel feature that they can zig-zag backwards and forwards in time, so as to achieve an effective 'spacelike propagation'." page 603.
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