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Recent observations suggesting that dark energy may actually be weakening have led to a new proposal: an unknown dimension called the “Dark Dimension,” offered as a possible key to the mystery. Under this hypothesis, the dimension arises from the interaction between dark matter and dark energy, an idea derived from superstring theory. On the 5ch Science News+ thread, serious debate over the universe’s breakdown of mass and energy mixed with jokes — parodies centered on Saint Seiya special-attack names topped the list — while some posters questioned how far the theory could ever be tested by observation.
What is the “Dark Dimension” that might link the universe’s two great mysteries, dark matter and dark energy?
Recent research has raised the possibility that dark energy is weakening. As debate continues over why, an unknown dimension called the “Dark Dimension” — arising from interaction with dark matter — may hold the key to the mystery.
For those who see the world as a dark place, it seems the universe is a dark place too.
Source: wired.jp / Read the original article here
What people said
Can we reclaim our billion-yen "delicious life" from the wonder-loving darkness?
Haven't seen her around lately, but I bet Hanako Yamada (comedian/tarento) is hiding in there.
Medaka Ikeno, bro… lol (veteran comedian known for his catchphrases)
Currently observed atoms make up 15% of the universe's mass, so together that's supposed to add up to 100%, apparently
It's confirmed that dark matter has mass in space, so it's using up energy.
Dark matter generates mass because it has drag/friction in the universe, so of course dark energy would arise too
25% of the total when you count mass and energy together,
versus 85% when you look at mass alone
The atoms currently observed generate 15% of the universe's mass
If we only count the atoms we can observe, energy consumption in space would be low, meaning that — for just those observed atoms — faster-than-light travel would become possible
If you pass only through the spots where our observable atoms are, you could move at high speed, but with no friction you'd go off course. Though if you collide with dark matter above a certain speed, maybe dark matter's mass could let you steer your course?
It's a contradiction: dark matter slows the universe's expansion, yet dark energy is what's supposedly accelerating it
Dark matter is only 25% of the whole universe, so isn't something off here?
Shouldn't we need more precise observations of whether the universe's expansion is faster or slower than the speed of light?
>>By studying the light arriving from supernovas like these, we can learn about the rate of the universe's expansion. This is the flash of light visible in the lower right of the Hubble Space Telescope image.
>>What we normally perceive are three spatial dimensions plus one time dimension. But string theory posits six or seven additional dimensions on top of those. All of these extra dimensions are thought to be as small as physically possible, close to the Planck length (10⁻³⁵m). However, researchers have proposed that the dark dimension could be far larger than the other dimensions — on the order of 1 micrometer (10⁻⁶m).
If spiritual beings exist, the only place left for them to exist would be as dark matter.
Maybe we're entering an era where it gets proven whether "spiritual beings" are just a psychic-scam sales pitch (a nod to Japan's "reikan shōhō" spiritual-goods scams)
Currently observed atoms: 15% of the universe's mass
※Together that's supposed to add up to 100% mass
In the universe, dark matter is 25%
Currently observed atoms are 75%
※Together that's supposed to add up to 100%
Regarding the universe's expansion
Dark energy is 70%
Energy whose source is currently 100% confirmed is 30%
※Together that's supposed to add up to 100%
Given all that, isn't something off?
It's beyond doubt that UFOs travel along a route that avoids dark matter, but as proven in Re: #14, merely moving faster than light doesn't stop it from being 100% observable by telescopes
Every single one of those UFO teleportation videos must be fake
Maybe the trick to high-speed travel in the universe is: use dark matter as a cushion — "building up the route" — and supply energy so the currently observed atoms can move faster than light?
Currently observed atoms make up 15% of the universe's mass, so you'd need to calculate the mass along the route from point A to point B
Maybe you'd need to fix the dark matter in place along a circular route between A and B, like a racetrack, so the energy can't escape?
But there's a phenomenon where galaxy mergers blow dark matter away, so maybe that whole setup is impossible?
You can't observe the inside of a black hole, but it's still there, right?
Under this hypothesis, dark matter interacts through nothing but gravity
Which means, if that's right, the WIMP and axion theories are both wrong, and the WIMP and axion search experiments would end up empty-handed
Of course, the fact that existing dark matter detection experiments haven't found anything doesn't prove this hypothesis is correct either
Also, there's apparently a prediction that Newton's gravity equation breaks down at the micron scale,
so I guess the question is whether that can be tested going forward
September 20, 2026, 11:10 PM
https://gigazine.net/news/20260920-supernova-cosmic-acceleration-questioned/
Conventional wisdom has held that "the universe keeps expanding, and its pace is increasing," but a research team from India's Tata Institute of Fundamental Research and the UK's University of Oxford used a catalog of observational data from more than 1,700 supernovae to test whether the evidence actually backs up "accelerating expansion" — and found there's a possibility that expansion isn't accelerating after all.
(omitted)
Going forward, the team says it wants to verify these results using data from the Vera C. Rubin Observatory's wide-field survey program, the "Legacy Survey of Space and Time." That survey is expected to observe several hundred thousand supernovae.
So the "Dark Dimension" shows up, huh — next up must be "Dark Angel"
Background and Talking Points on This Topic
Under the current standard model of cosmology, the universe’s energy/mass breakdown is roughly 68% dark energy, 27% dark matter, and 5% observable ordinary matter. In the thread, several different ratios were thrown around — “85% dark matter, 15% ordinary matter,” “25% dark matter, 75% ordinary matter,” and so on — leading to some talking-past-each-other moments; this appears to stem from conflating mass-based ratios with total-energy-based ratios, and it’s worth noting these figures differ from the standard ones. Also, the “Dark Dimension” is, at the end of the day, just one hypothesis derived from superstring theory — it could potentially be tested in the future through deviations in Newtonian gravity at the micron scale, but it has not been demonstrated at this point. The thread also touched on a reanalysis of supernova data (per a Gigazine article) that questions the universe’s accelerating expansion itself — that’s a separate line of research questioning the existence of dark energy altogether, and shouldn’t be conflated with the above.
※This article is compiled from excerpts and a summary of the 5ch (Science News+) thread “[Cosmology] What is the “Dark Dimension” that might link the universe’s two great mysteries, dark matter and dark energy?“.
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