A warm dark matter search using XMASS: Editors' suggestion of Physical Review Letters

October 7, 2014, The Kavli Foundation
A warm dark matter search using XMASS: Editors' suggestion of Physical Review Letters
Construction of XMASS-Ⅰ detector (2010/Feb./25) (C) Kamioka Observatory, ICRR(Institute for Cosmic Ray Research), The University of Tokyo

The XMASS collaboration, led by Yoichiro Suzuki at the Kavli IPMU, has reported its latest results on the search for warm dark matter. Their results rule out the possibility that super-weakly interacting massive bosonic particles (bosonic super-WIMPs) constitute all dark matter in the universe. This result was published in the September 19th issue of the Physical Review Letters as an Editors' Suggestion.

The universe is considered to be filled with , which cannot be observed by ordinary light. Although much evidence supports the existence of dark matter, it has yet to be directly detected and its nature is not understood.

Various theoretical models have been proposed to explain the nature of dark matter. Some models extend the standard model of particle physics, such as super-symmetry, and suggest that weakly interacting massive particles (WIMPs) are . These models have motivated most experimental research on dark matter. In discussions on the large-scale structure formation of the universe, these WIMPs fit the (CDM) paradigm.

On the other hand, some simulations based on the CDM scenario predict a much richer structure of the universe on galactic scales than those observed. Furthermore, high-energy collider experiments have yet to provide evidence of super-symmetric particles. These facts have increased the interest in lighter and further weakly interacting particles such as bosonic super-WIMPs as dark matter. Super-WIMPs with masses greater than a twentieth of an electron (more than 3 keV) do not conflict with the structure formation of the universe.

"Bosonic super-WIMPs are experimentally attractive since if they are absorbed in ordinary material, they would deposit energy essentially equivalent to the super-WIMP's rest mass," Suzuki says. "And only ultra-low background detectors like XMASS can detect the signal."

The XMASS experiment was conducted to directly search for such bosonic super-WIMPS, especially in the mass range between a tenth and a third that of an electron (between 40 and 120 keV). XMASS is a cryogenic detector using about 1 ton of liquid xenon as the target material. Using 165.9 days of data, a significant excess above the background is not observed in the fiducial mass of 41 kg. The absence of such a signal excludes the possibility that bosonic super-WIMPs constitute all dark matter in the universe.

"Light super-WIMPs are a good candidate of dark matter on galactic scales," Professor Naoki Yoshida, a cosmologist at the School of Science, the University of Tokyo and a Project Professor at the Kavli IPMU says. "The XMASS team derived an important constraint on the possibility of such light dark models for a broad range of particle masses."

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4.3 / 5 (6) Oct 08, 2014
no fate wrote, "...when you can't register a mass reaction and you are dealing with tolerances which are fractions of an electron mass, and you are still going to adhere to the insane theory that most of the matter in the universe is like this, you deserve the dunce cap."

Oh, come on. Nobody knows what dark matter is, and that includes you. So they're looking. That's reasonable to do.

The only dunce caps that need to be awarded are for those who are *sure* they know what the answer is, despite absolutely no evidence for it, and the answer is (insert fringe tinfoil hat non-peer-reviewed explanation here).

Dark matter might turn out not to be a particle at all. But the way to find out is to look.

You are trolling working scientists to make yourself look smart. Hint: it's not working.
Oct 08, 2014
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3 / 5 (4) Oct 08, 2014
More unicorn hunters trying to violate General Relativity.. Gaming fools to fund nonsense.
3 / 5 (4) Oct 08, 2014
Gravity is a vector under GR and Newton, but in fake physics Gravity is a scalar. How stupid.
Captain Stumpy
4.2 / 5 (5) Oct 08, 2014
How stupid.
Of course, you will also note that the poster telic (who is actually Zephir) also said this
prediction of scalar waves is tightly connected with dense aether model
as well as
which shows that the person in question is not logical nor firmly grounded in reality, given that this philosophy was debunked with real physics like this:
or with this study:

so he is one of those "unicorn hunters" you were speaking of in the first post.
Don't mind him... this is his religion, so he is proselytizing

3 / 5 (4) Oct 08, 2014
Zephyr, you ignorant slut.
1 / 5 (2) Oct 08, 2014
The leading theories under the scientific method from Newton and Einstein only work where Gravity is a vector. No colloquy can change these laws of gravity.
1 / 5 (3) Oct 08, 2014
Dark matter is eliminated entirely by adding a little trig to account for the spiral nature of our galaxy to General Relativity and solving.
5 / 5 (2) Oct 09, 2014
Or we can go the logical route and say, "since it doesn't interact in the EM spectrum at all...how can it have mass?"

Is that an actual question or an argument from incredulity?
Da Schneib
5 / 5 (3) Oct 22, 2014
Oh, look there, Zeph has a new sockpuppet: telic.

Good article. Constraining dark matter will eventually lead to finding out what dark matter is, by eliminating all the things it cannot be.

Meanwhile, SuperCDMS, LZ, and the axion search all are funded and continuing. We should hear from them in the next few years.

not rated yet Oct 27, 2014
You notice the term "considered to be filled with dark matter" and "models" and "not observed". This is just a lot of horse pucky gueses. Until you can actually prove any of this exists it is all horse pucky. A far simplier explanation is the observations are wrong, the estimated mass is to small, the things effecting the galaxies are not gravity from dark matter or regular matter. I give you plasma current and the resulting magnetic fields as a possible example which does not require a lot of wimps, large, small or regular.

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