- #1
jpescarcega
- 9
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Fellow Nerds,
I'm looking for a quantitative relationship between the gravitational strength of a point on a field and the speed of expansion of space at that point. Given a cosmological constant and a metric, is it possible to pinpoint a certain point of space and ask how quickly that space is expanding?
I'm assuming that space doesn't just rapidly/rigidly begin expanding in a vacuum where "gravity equals zero". In GR, gravity extends forever and never reaches zero, and if the cosmological constant is supposed to represent an antigravity force (dark energy), that would suggest that space expands at different rates, since that force isn't just immediately overtaken -- gravity can be weak enough at a certain point to only counter half of the antigravity force, right?
I'm not asking how to get hubble's constant. The FLRW solution doesn't seem to answer the question, nor do the Friedmann equations. I'm talking about looking at a gravitational field (where the cosmological constant is taken into account in the Einstein Field Equations) and picking a point on that field, (where you know the strength of gravity at that point) and asking: "what is the speed of the expansion of space at that point?" (if it is expanding).
Excited To Read Your Answers,
-JP
I'm looking for a quantitative relationship between the gravitational strength of a point on a field and the speed of expansion of space at that point. Given a cosmological constant and a metric, is it possible to pinpoint a certain point of space and ask how quickly that space is expanding?
I'm assuming that space doesn't just rapidly/rigidly begin expanding in a vacuum where "gravity equals zero". In GR, gravity extends forever and never reaches zero, and if the cosmological constant is supposed to represent an antigravity force (dark energy), that would suggest that space expands at different rates, since that force isn't just immediately overtaken -- gravity can be weak enough at a certain point to only counter half of the antigravity force, right?
I'm not asking how to get hubble's constant. The FLRW solution doesn't seem to answer the question, nor do the Friedmann equations. I'm talking about looking at a gravitational field (where the cosmological constant is taken into account in the Einstein Field Equations) and picking a point on that field, (where you know the strength of gravity at that point) and asking: "what is the speed of the expansion of space at that point?" (if it is expanding).
Excited To Read Your Answers,
-JP