[HN Gopher] Study suggests a 'dark mirror' universe within ours ...
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Study suggests a 'dark mirror' universe within ours where atoms
failed to form
Author : clockworksoul
Score : 50 points
Date : 2024-02-20 19:48 UTC (3 hours ago)
(HTM) web link (www.livescience.com)
(TXT) w3m dump (www.livescience.com)
| tiagod wrote:
| The paper: https://arxiv.org/abs/2401.12286
| dang wrote:
| Url changed from https://futurism.com/the-byte/dark-matter-
| mirror-universe, which points to this.
| SoftTalker wrote:
| "Dark matter is the mysterious, unknown substance that seems to
| make up the bulk of all the mass in the universe; for every 2
| pounds (1 kilogram) of regular matter, there's roughly 10 pounds
| (5 kg) of dark matter."
|
| ...
|
| "This symmetry would help explain why dark matter and regular
| matter have roughly the same abundances."
|
| So 1 is "roughly the same" as 5, or is this an orders-of-
| magnitude comparison?
| yokaze wrote:
| "Roughly the same abundances" meaning, why we usually (but not
| always) find evidence of dark matter in places, where we see
| regular matter.
| delecti wrote:
| It seems that yes, they're saying that 1 and 5 are roughly the
| same. Basically, why is the matter in the universe ~20% "non-
| dark", and not 1%, or .001%?
| timeagain wrote:
| There's that old joke that computer scientists think any
| numbers within a power of two are equal, physicists think any
| numbers within a power of 10 are equal, and mathematicians
| only distinguish between finite numbers and infinity.
|
| Edit: and engineers are as precise as they are paid to be.
| xjay wrote:
| "The 80/20 rule"/The Pareto principle
|
| > Mathematically, the 80/20 rule is roughly described by a
| power law distribution (also known as a Pareto distribution)
| for a particular set of parameters. Many natural phenomena
| distribute according to power law statistics. It is an adage
| of business management that "80% of sales come from 20% of
| clients." [1][2]
|
| [1] https://en.wikipedia.org/wiki/Pareto_principle
|
| [2] https://en.wikipedia.org/wiki/Power_law
| labster wrote:
| In astronomy and cosmology, 1 and 5 are the same number. Only
| the orders of magnitude matter when talking about large things.
| At atomic scales and in photon length the precise numbers do
| matter.
| PaulHoule wrote:
| ... if dark matter is something totally different from light
| matter there might be 1000x more of it.
| neltnerb wrote:
| They're describing relative mass, which is related to
| gravitational attraction and inertia, whether there is
| "more" is not something they measured.
|
| What is "more"?
| PaulHoule wrote:
| Total mass as measured by gravitation effect.
| BurningFrog wrote:
| Also in astronomy, all elements other than hydrogen and helium
| are considered "metals":
| https://public.nrao.edu/blogs/astronomy-is-metal/
|
| It's really not an exact science...
| shrimp_emoji wrote:
| Well, at astronomical scales, everything's mostly just
| hydrogen with tiny bits of hard stuff mixed in. :p
| ClassyJacket wrote:
| >It's really not an exact science...
|
| I think this is the first time I've ever heard someone use
| this phrase in reference to an actual science
| woah wrote:
| Waiting for the sci fi movie
| tanvach wrote:
| Curious about conservation of charge - if all dark protons were
| to decay then there must be also an abundance of dark positrons?
| ars wrote:
| You misread the article, it was not saying there are dark
| protons. It was using proton decay as an analogy.
|
| But to answer your question anyway, if a proton did decay then
| yes, it would be to a positron plus something else.
| shrimp_emoji wrote:
| So that's where we go when we die?
| bemusedthrow75 wrote:
| And now it's a sci-fi _horror_ movie.
| amriksohata wrote:
| Unrelated, but somewhat interesting in Hindu cosmology and
| ancient scriptures the edges of the bubble of the universe store
| everything happening, that has happened and is to happen.
| bookofjoe wrote:
| "The past, present and future are only illusions, even if
| stubborn ones." -- Albert Einstein in a letter to a friend
| CyanBird wrote:
| Same in actual cosmology, it is called the holographic
| principle. The concept is that 3D bodies can be losslessly
| represented on a distant 2D plane which envelops them or
| alongside the spherical perimeter of a black hole if they are
| squished to it
|
| It is not all that applicable, but it is interesting to think
| about and there are people studying it
| ChrisClark wrote:
| I have joked before about the apparent lack of life in the
| universe, that we are just living in unencrypted 'plain text'
| mode. But all the developed aliens have moved to encrypted space.
| ;)
| disadvantage wrote:
| Humans have went dark considerably over the years. I don't know
| the exact date when encrypted comms became the norm, but we
| rarely transmit plaintext out into the Universe anymore. We
| still leak plaintext, but the vast majority is encrypted now.
| zer00eyz wrote:
| Maybe were stuck here cause were made out of meat...
|
| https://www.mit.edu/people/dpolicar/writing/prose/text/think...
|
| https://www.youtube.com/watch?v=T6JFTmQCFHg
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