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As Always, I'm Confused

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Posted by Luis Hamburgh on September 29, 2001 03:05:47 UTC

Joseph,

If a given volume of spacetime is free of particles, what exactly is there that makes this volume of spacetime exist? *Can* a vacuum, a vacuum wherein nothing exists for more than a temporal minium, exist? Given the notion of the Uncertainty Principle, it's hard for me to consider anything that appears and then disappears within the span of a singular Planck time a 'vacuum.' I'm not looking to correct anyone's definition, I'm just curious if a true vacuum can exist for a substantial time (or would a true vacuum necessitate the absence of time, as space & time are inextricably tied together)?

>>>"gravity as a distortion of spacetime geometry">"causality"

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