We doan need no steenkin' dark energy
- pakarinen
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We doan need no steenkin' dark energy
Abstract
We show that by allowing our Universe to merge with other universes one is lead (sic) to modified Friedmann equations that explain the present accelerated expansion of our Universe without the need of a cosmological constant.
https://iopscience.iop.org/article/10.1 ... 023/12/011
Man... That's some icky-tasting stuff!
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- hosshead
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Re: We doan need no steenkin' dark energy
how do they propose we disallow merging of universes?
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Re: We doan need no steenkin' dark energy
Scopes; Tiny little Mak-Cass Celestron c90 spotter scope that lets me count the moons of Jupiter and with which I can see Saturns rings in Mickey Mouse phase
Old Meade 1000mm f/11 that was missing the finder scope and ring so I rigged one onto the barrel using duct tape and a bit of cardboard and that actually works and I can count the moons of Jupiter with this one too.
Meade 6" reflector,(really elderly), found at a yard sale, the tube is a bucket of rust and corroded mirror but the mount and tripod will be recoverable so hooray for that.
Cameras; Mamiya medium format 645 with a couple of polaroid backs and a series of wide angle to 50mm lenses
Konica-Minolta 35mm,Sony alpha dslr's, up to the a900 full frame, mostly got them used because I don't have much money.
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Re: We doan need no steenkin' dark energy
If we're in the process of merging with another Universe it's highly likely we'll never know.
Unless it causes a phase transition that wipes us out, but then we would definitely never know!
Graeme
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Re: We doan need no steenkin' dark energy
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Re: We doan need no steenkin' dark energy
Is it? Did you read the whole thing? Somehow, I don't think so, otherwise, you would have realised that this is about the Hubble constant. There is no concrete evidence to suggest that the Hubble constant and dark energy are indeed the same thing. They could be, but we won't know how closely they are related and if they are the same thing until we get the results of the latest full data sets from the most recent experiments, which are still in progress. The authors are quite careful about that.
Ultimately, the Hubble tension is a motivating factor for this paper which attempts to address the issues associated with the two measured values for the Hubble constant by invoking the idea of bombardment by baby iniverses. However, as the authors of the paper state, there are caveats. Some of these are quite important to consider before one states that something is or is not required. For example...
First and perhaps the most difficult one to swallow is the fact that they address a real measured problem in the observable universe with something that is ultimately pure speculation and hypothetical.
As stated, the models used are quite primitive and unrealistic
They apply to late-time evolution and say nothing about the early evolution of the universe, except where the authors speculate that our universe could have been absorbed by a larger universe, thus doing away with the need for an inflation field and associated inflaton. They then go on to say that they have no process for this and it's difficult to say if this is even possible and might not even do away with the need for inflation.
Different model modes are required to deal with the different measured Hubble parameters requiring a best-fit scenario.
These 'possibilities' are all modelled in 'minispace' environments and they are not sure how this would all play out in the real world.
Thus, while it is an interesting idea, and it genuinely is. It merely hints at the possibility of an alternative view that might hold credence, if it were possible to prove that our universe has indeed been bombarded by baby universes.
It does nothing to prove that we don't need dark energy. It shows an expanding universe that doesn't require a Hubble constant. So dark energy is merely replaced with baby universe collisions that squash the Hubble Constant yet still provide expansion. In other words, dark energy is still required to get the universe we live in. Just a different phrasing.
Our current best-fit model still stands, for now.
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Baby Universes Mergers
https://www.space.com/universe-merging- ... -expansion
An interesting theory.
Graeme
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Re: Baby Universes Mergers
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Re: Baby Universes Mergers
The same study is posted here viewtopic.php?t=33431Graeme1858 wrote: ↑Mon Feb 19, 2024 2:28 pm Our universe is merging with 'baby universes', causing it to expand, new theoretical study suggests
https://www.space.com/universe-merging- ... -expansion
An interesting theory.
Graeme
It is an interesting idea but isn't without plenty of caveats. As they say at the end of the article "only observational data can validate their hypothesis" ...It'll be interesting to see what Ethan Siegel and others say about this.
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Re: We doan need no steenkin' dark energy
We can add Ethan's and other's comments here.
Graeme
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- AntennaGuy
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Re: We doan need no steenkin' dark energy
https://www.sciencealert.com/physicist- ... -years-old
which is apparently based on:
https://iopscience.iop.org/article/10.3 ... 357/ad1bc6
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Prof. Barnhardt to Klaatu in The Day the Earth Stood Still: "There are several thousand questions I'd like to ask you.”
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