Mapping historical changes in dark matter

February 13, 2019, Kavli Institute for the Physics and Mathematics of the Universe
(Left) The 3-dimensional dark matter map of the universe inferred from one of the six HSC observation areas is shown in the background with various shades of blue (brighter areas have more dark matter). The map was inferred from the distortions of shapes of galaxies in the HSC data which are indicated by white sticks. The stick lengths represent the amount of distortion and the angle of the stick corresponds to the direction of the distortion. (Right) The measurements are enabled by the light from distant galaxies that travels through the universe and gets deflected by matter at different epochs in the universe, before reaching the Subaru telescope. Credit: HSC Project/UTokyo

Combining Einstein's theory of relativity with one of the most powerful telescopes in the world has helped an international team of researchers measure where and how dark matter structures grow in the universe. Their analysis suggests cosmic structures might be evolving more slowly than previously predicted.

A team led by the Kavli Institute for the Physics and Mathematics of the Universe constructed a map of throughout the history of the universe by analysing images of more than ten million galaxies. The results appear to challenge current understanding of the fundamental laws of physics.

"If further data shows we're definitely right, then it suggests something is missing from our current understanding of the Standard Model and the general theory of relativity," says physicist Chiaki Hikage.

According to Einstein's , gravity warps space and time. To date, this theory has successfully predicted the expansion of the universe, the existence of black holes, and the bending of light from distant stellar objects. If cosmologists confirm that the observed universe is evolving more slowly than the theory predicts, it would mean an entire branch of physics has not yet been discovered.

Dark matter is responsible for the formation of galaxies, and is responsible for accelerating the ongoing expansion of the universe. Together, they make up 95 percent of the universe. Mapping the density of dark matter in today's universe and reconstructing historical maps of dark matter going back 13 billion years could help study changes in dark matter over time. Such a comparison could also elucidate how dark energy has influenced dark matter's growth in the universe.

A still shot from the short "HSC Mass Map" video from Kavli IMPU showing a 3D map of how mass, including dark matter, is distributed throughout the universe. Like this still shot shows, the areas with more mass are represented by brighter red and yellow colours, and less mass represented by blue and black. Credit: HSC Project

Dark matter is not visible, but its effects can be seen on the shape of galaxies. Since the gravity of all matter, including invisible dark matter, bends the path of light, far away galaxies appear distorted to observers on Earth. Researchers can calculate how the dark matter is distributed in the universe through the distortions of galaxies.

Hikage and his team analysed images of ten million galaxies from the Hyper Suprime-Cam (HSC) Survey. This 870 , attached to the 8.2 metre Subaru telescope at the summit of Maunakea, Hawaii, surveys the sky, drawing a detailed map of the universe. It is enabling researchers to study galaxies billions of from Earth. These existed billions of years ago, but their light is only reaching Earth today, making it possible for researchers to study the universe from its infancy.

Using the information from these images, the researchers were able to make the most detailed three-dimensional map of dark in the universe to date. The map was consistent with past studies. However, it also suggests cosmic structures might be evolving more slowly than predicted by other research teams.

Credit: Kavli Institute for the Physics and Mathematics of the Universe

Hikage explains that more data is needed. "With a little more work, if we can get better accuracy, we might be able to find something concrete. This is a big motivating factor for me."

The researchers will continue to analyse more HSC Survey data, bringing them closer to discovering whether science needs to rewrite its rules about the .

Explore further: Astronomers find that dark matter dominates across cosmic time

Provided by: Kavli Institute for the Physics and Mathematics of the Universe

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cantdrive85
2.2 / 5 (10) Feb 13, 2019
. If cosmologists confirm that the observed universe is evolving more slowly than the theory predicts, it would mean an entire branch of physics has not yet been discovered.

We'll call it dark something or other. Couldn't possibly be that the standard guesswork is wrong.
MrBojangles
4.2 / 5 (10) Feb 13, 2019
We'll call it dark something or other. Couldn't possibly be that the standard guesswork is wrong.


Better yet, we can stop doing science and chalk everything up to electricity and plasmoids.
theredpill
1.5 / 5 (8) Feb 13, 2019
"Better yet, we can stop doing science "

When you say "we" I know you don't mean you....LMAO...what is that little equation you have to show the pressure based heating of matter in the Corona again? What is that relationship again? Between pressure and temperature...in the corona? I hope you still have me on ignore Kittykat....two days in a row of you exposing your level of understanding and literacy could land you in an asylum.
Joe1963
1 / 5 (4) Feb 13, 2019
I would like to offer my explanation for dark matter and dark energy; it also deals with the odd behavior of Oumuamua. It is a modified gravity hypothesis. I paste an abstract here along with a link to my reddit article on this:
ABSTRACT
Galactic rotation rates, the distribution of matter in the early universe shown by the scale of anisotropies in the CMB, and cosmological expansion present problems that current theory attempts to resolve by positing dark matter and dark energy. This paper posits that gravitational force is a dampened wave function dependent upon mass and distance. Therefore gravity reverses at regular dampened intervals. This reversal would also be in effect at smaller scales such as our own solar system, implying that current theory may have overlooked evidence of this in the data from various probes that have been launched.
LINK: https://redd.it/ao8vfo
Bob West
1 / 5 (2) Feb 13, 2019
Dark matter is a supersolid that fills 'empty' space, strongly interacts with ordinary matter and is displaced by ordinary matter. What is referred to geometrically as curved spacetime physically exists in nature as the state of displacement of the supersolid dark matter. The state of displacement of the supersolid dark matter is gravity.

The supersolid dark matter displaced by a galaxy pushes back, causing the stars in the outer arms of the galaxy to orbit the galactic center at the rate in which they do.

Displaced supersolid dark matter is curved spacetime.

In the Bullet Cluster collision the dark matter has not separated from the ordinary matter. The collision is analogous to two boats that collide, the boats slow down and their bow waves continue to propagate. The water has not separated from the boats, the bow waves have. In the Bullet Cluster collision the galaxy's dark matter displacement waves have separated from the colliding galaxies, causing the light to lense.
valeriy_polulyakh
1 / 5 (1) Feb 13, 2019
Recently two papers have been published. The first one deals with the measurement of the speed of rotation of galaxies and, in our view, closes the issue of the existence of dark matter. The second one argues that the expansion of the universe is not accelerating. However, this fact does not answer the question as to what in general is the cause of the universe's expansion and does not address the widespread opinion that 70% of the universe consists of dark energy.
https://www.acade...k_Energy
BobSage
2.3 / 5 (3) Feb 13, 2019
Seems like the standard theory is getting rickety. How much more can be glommed onto it before it collapses?
rrwillsj
5 / 5 (2) Feb 13, 2019
Well Bob, when you come up
with a mathematically sustained theory?
That results in a working non-nuclear reaction to the same scale of fission-fusion energy as SR/GR/QM Theories?

Then maybe you wooloons could gain some professional attention? Besides the Mental Health specialists.

Right now? None of you have any credibility because you are incapable of inventing any working device that proves your claims.

While using the very technology, computers, cell phones, internet, video-game controllers based on the scientific research you deny & disparage as inferior to your fabulist vaporware.
cantdrive85
2.1 / 5 (7) Feb 14, 2019
While using the very technology, computers, cell phones, internet, video-game controllers based on the scientific research you deny & disparage as inferior to your fabulist vaporware.

Please point to the working devices that are due to GR or SR. Good luck!
Da Schneib
3.9 / 5 (7) Feb 14, 2019
Please point to the working devices that are due to GR or SR. Good luck!


GPS satellites. Nuclear weapons. Television. Radar guns. Satellite TV.

Next?
jonesdave
3.7 / 5 (6) Feb 14, 2019
While using the very technology, computers, cell phones, internet, video-game controllers based on the scientific research you deny & disparage as inferior to your fabulist vaporware.

Please point to the working devices that are due to GR or SR. Good luck!


Due to? WTF? If, however, you fail to take account of those, then your GPS is useless.
cantdrive85
2.6 / 5 (5) Feb 14, 2019
GPS satellites. Nuclear weapons. Television. Radar guns. Satellite TV.

GPS satellites may or may not use GR, but it is not necessary. The rest of your examples, not even close.
jonesdave
3 / 5 (4) Feb 14, 2019
GPS satellites may or may not use GR, but it is not necessary.


Yes it is. As proven decades ago. Stop lying.
torbjorn_b_g_larsson
5 / 5 (3) Feb 14, 2019
If one reads the accepted paper [ https://arxiv.org...9148.pdf , https://www.scien...rd-model ] it is easy to see that the press release is playing up what is not in their paper. Re: " it suggests something is missing from our current understanding".

The paper itself tests the LCDM well and find no significant tension. On the contrary with all the data it gets constant dark energy as best model and it lowers LCDM uncertainties - it agrees with the Planck Hubble parameter and lowers the significance in the tension against the local supernova Hubble estimate. The earlier slight DES deviation of slow structure growth [ https://www.scien...k-matter ] is neither improved nor decreased.

In other words, the usual LCDM win that we are so used to read with most every new cosmological data survey.

- tbctd-
torbjorn_b_g_larsson
4 / 5 (4) Feb 14, 2019
- ctd -

To sum up the result, to no one's surprise this result goes against the expected trolls.

They were too lazy to retrieve the paper and read it. And their seriously flawed comments speak for them.
torbjorn_b_g_larsson
5 / 5 (3) Feb 14, 2019
Please point to the working devices that are due to GR or SR. Good luck!


GPS satellites. Nuclear weapons. Television. Radar guns. Satellite TV.


Actually modern field theory, electronics, optics, and chemistry has a century of SR. You cannot understand these areas on modern levels if you do not include it. For a simple example, magnetism is an SR effect (though classically they did not know that), so old fashioned relays are due to SR.
rrwillsj
3 / 5 (2) Feb 14, 2019
Well cant, I cant offer anymore of a reply to your cant. Than the sane commentators have already replied to your gibberish.

Until the middle of the night. When I will suddenly wake-up, yelling "Stochastic Evolution!"

Oh, that reminds me.
Uh, fellows? Please do not blow uo my city.
Appreciate your interest in the subject but I'd as soon do without. Thanks guys.

Another thing I'd as soon do without?

cant round up your cliche clown posse of frauds & remove yourselves from the premises. The stench of woolunacy is a miasma of poor mental hygiene.
rrwillsj
1 / 5 (1) Feb 17, 2019
I just had a wonderment.
There do seem to be a steady stream of fulsome flaring from smaller than Sol-mass stars?

Is this because they are more available for observation?
Or. perhaps observed more often than Sol-type stars?

Or. are there possibly other reasons for the apparent abundance of small sub-Sol dwarf star flaring so much?

A speculation here...
Are the smaller stars lacking the mass to stabilize their energy output?
For instance, if a sub-par star goes through not-so-subtle cycles of building up excess energy, releasing as a flare?
Then going through an exhausted period to recuperate before flaring again.?
& over tens & hundreds of billions of years, these stars being so small,
lack the gravity-well to retain the material & energy vomited?

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