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Old 2019-09-24, 06:37   #23
retina
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Quote:
Originally Posted by xilman View Post
In that case, you are propounding metaphysics, not physics. I thought we were discussing the latter.
If it is affecting our universe then it is part of physics. Just like the balloon analogy with 2D space on the 3D balloon surface there might be something "inside" that is making our space expand.1 If we just ignore it and say "there is nothing there" then we fail to properly explore all the options.

1I notice that the question about what is making our space expand is still to be answered.
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Old 2019-09-24, 06:54   #24
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The fact that the "Observable-Universe" started as an expansion from a singularity point entails that our frame of reference has at some point in history been within the Event-Horizon of any given Black-Hole. What does that tell you about the time elapsed since the Big-Bang?
What time would a hypothetical clock show in/to our frame of reference, which was dropped just outside of the Event-Horizon of any given Black-Hole just as our frame of reference moved away via the expansion of the universe?
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Old 2019-09-24, 07:01   #25
xilman
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Quote:
Originally Posted by retina View Post
If it is affecting our universe then it is part of physics. Just like the balloon analogy with 2D space on the 3D balloon surface there might be something "inside" that is making our space expand.1 If we just ignore it and say "there is nothing there" then we fail to properly explore all the options.

1I notice that the question about what is making our space expand is still to be answered.
What testable predictions does your hypothesis make which disagree from those made by main-stream theory?

The answer to your first is summarized in the phrase "singularity theorems", as proved by Penrose and Hawking in the context of GR. A space-time described by GR is either in a state of unstable equilibrium (a solution for which employs Einstein's cosmological constant) or has at least one singularity.

Last fiddled with by xilman on 2019-09-25 at 08:58 Reason: Add Wikipedia link
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Old 2019-09-25, 08:16   #26
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@LaurV
kudos on starting this interesting thread topic

@xilman
thanks for providing considered answers within this thread
your insight (and humour and in all of its shades) always has content that is worthy of consideration

A challenging subject that requires the perception and attributes exemplified by Fred Hoyle and many others whose courage was tested to increase our awareness.
Battling superstition and convention (a kind of dark energy) is not a trivial task. Evidence has a habit of lingering and its presentation is almost important as its existence.
Unfortunately, sometimes the mavericks of change become the impediments of convention to future change. Like spaghetti, someone is going to fling the right "al dente"
consistency of mathematics at a wall and it will stick (perhaps this is how string theory came to be?) and these runic symbols stuck on that wall will be interpreted in a way that will create some new knowledge from the same ingredients and recipe that everyone was already looking at.

Last fiddled with by jwaltos on 2019-09-25 at 08:41 Reason: more stuff
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