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Discussion and Debate
Discussion and Debate
Physical & Life Sciences
Apologetic value of the acceleration of the expansion of the universe
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<blockquote data-quote="Michael" data-source="post: 74377524" data-attributes="member: 627"><p>With introduction of a non zero constant (not necessarily space expansion however), GR also allows for a static universe. That was Einstein's initial impetus for adding a non zero constant in fact.</p><p></p><p></p><p></p><p>Well, even that premise is not actually 100 certain in GR. It depends on what you think "dark energy" and/or the cause of acceleration might be, and whether you believe that dark energy will continue to remain constant throughout expansion. If you don't make the assumption that dark energy will remain constant indefinitely, it's conceivably possible that the universe could expand and accelerate for awhile, but eventually slow down over time and even conceivably contract again.</p><p></p><p>You can't entirely rule out the potential for later contraction simply based on what's happened in the past. </p><p></p><p>And of course all of these ideas are predicated on one's interpretation of the exact cause of cosmological redshift. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Michael, post: 74377524, member: 627"] With introduction of a non zero constant (not necessarily space expansion however), GR also allows for a static universe. That was Einstein's initial impetus for adding a non zero constant in fact. Well, even that premise is not actually 100 certain in GR. It depends on what you think "dark energy" and/or the cause of acceleration might be, and whether you believe that dark energy will continue to remain constant throughout expansion. If you don't make the assumption that dark energy will remain constant indefinitely, it's conceivably possible that the universe could expand and accelerate for awhile, but eventually slow down over time and even conceivably contract again. You can't entirely rule out the potential for later contraction simply based on what's happened in the past. And of course all of these ideas are predicated on one's interpretation of the exact cause of cosmological redshift. :) [/QUOTE]
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Apologetic value of the acceleration of the expansion of the universe
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