18/02/10 00:37:34.22 CAP_USER.net
Cosmic x-rays may provide clues to the nature of dark matter
According to common theory, dark matter must exist because otherwise stars would not continue to rotate around the center of their galaxies as they in fact do. Among the particularly favored candidates for dark matter are so-called weakly interacting massive particles,
or WIMPs. Researchers are searching for these in the Italian Gran Sasso underground laboratory, for example.
But recent scientific publications in the field of astroparticle physics are increasingly taking the view that WIMPs are unlikely to be viable prospects when it comes to dark matter.
"We, too, are currently actively on the search for possible alternatives," said Professor Joachim Kopp of Mainz University.
The physicist, together with his colleagues Vedran Brdar, Jia Liu, and Xiao-Ping Want, took a closer look at the results of observations undertaken by several independent groups in 2014.
The groups reported the presence of a previously undetected spectral line, with an energy of 3.5 kiloelectron volts (keV), in x-ray light from distant galaxies and galaxy clusters.
This unusual x-ray radiation might offer a clue to the nature of dark matter.
It has been previously pointed out that dark matter particles might decay, thereby emitting x-rays.
However, Joachim Kopp's team at the Mainz-based Cluster of Excellence on Precision Physics, Fundamental Interactions and Structure of Matter (PRISMA) is taking another approach.
X-Ray Lines from Dark Matter Annihilation at the keV Scale.
URLﾘﾝｸ(journals.aps.org)
URLﾘﾝｸ(www.sciencedaily.com)
2:虫くん ★
18/02/10 00:37:52.18 CAP_USER.net
つづき
X-ray radiation produced by the annihilation of dark matter
The PRISMA researchers propose a scenario in which two dark matter particles collide, resulting in their mutual annihilation.
This is analogous to what happens, for instance, when an electron meets with its antiparticle, a positron.
"It has long been assumed that it would not be possible to observe such annihilation of dark matter if it were made of particles that light," explained Kopp.
"We have subjected our new model to scrutiny and have compared it with experimental data, and it all fits together much better than in the case of older models."
According to Kopp's model, dark matter particles would be fermions with a mass of only a few kiloelectron volts, frequently called sterile neutrinos.
Such lightweight dark matter is usually considered problematic because it makes it difficult to explain how galaxies could have been formed.
"So far, we have been able to deal with these concerns," explained Kopp.
"Our model provides an elegant way out." The supposition that the annihilation of dark matter is a two-step process is of crucial importance in this context: during the initial stage of the process, an intermediate state is formed, which later disintegrates into the observed x-ray photons.
"The results of our calculations show that the resulting x-ray signature correlates closely with the observations and thus offers a novel explanation for these," added Kopp.
At the same time, the new model itself is so general that it will offer an interesting starting point for the search for dark matter even if it turns out that the spectral line discovered in 2014 has a different origin.
Theoretical and experimental physicists at JGU are currently working on the proposed ESA mission e-ASTROGRAM, which aims at analyzing astrophysical x-ray radiation with previously unachieved accuracy.
3:名無しのひみつ
18/02/10 00:40:46.76 6oNg7LMe.net
Is the set of new particles really necessary?
4:名無しのひみつ
18/02/10 00:42:16.94 wSZYT3lp.net
日本語で桶
5:名無しのひみつ
18/02/10 00:43:39.61 PlmLsVgT.net
kpopまで読んだ
6:名無しのひみつ
18/02/10 00:52:25.92 Z5qGYuyF.net
エックスレイ、ラディエーション プロデュースド バイ ザ アニヒレーション オブ ダークマター
ふむふむ。
7:名無しのひみつ
18/02/10 00:53:40.44 4lIDfbHm.net
ニュートリノは電子に対応する電子ニュートリノ、ミュー粒子に対応するミューニュートリノ、タウ粒子に対応するタウニュートリノ3種類で決まりだったはずじゃなかったのか？
それに対応してクォークの種類は6種類になるはずと。
もしニュートリノにそれ以上の種類があるとすればそれに対応して電磁力を司る電子族もそれ以上の種類があるはずだということになるし、
かつクォークも6種類では留まらないということになるのでは。
8:名無しのひみつ
18/02/10 01:04:20.60 BrnMBTgV.net
ステライルニュートリノはモンゲチッタ理論で証明できなかったろ？
ドゥマイニースコスコからピュッサルまで質量がヌリセラルGsなんだからよ
9:名無しのひみつ
18/02/10 01:58:42.28 Lb79mV2z.net
いつまでダークマターとか妄想で固めるんだろ、
重力計算の時間パラメータすら脳内補完でまともに捉えられない奴だらけの中で、
10:名無しのひみつ
18/02/10 02:05:16.82 NqQPTR9Y.net
日本語で
11:名無しのひみつ
18/02/10 02:12:25.76 9hlHFvUY.net
たとえ日本語で書かれても判らない俺に、誰かサザエさんで例えてくれ！
12:名無しのひみつ
18/02/10 02:32:11.45 nyzOOznM.net
SIMP云々？
13:名無しのひみつ
18/02/10 08:34:11.80 qrjQOnrw.net
イオンコイルを創れば、即解決するから、どーでもいいやｗ
14:名無しのひみつ
18/02/10 08:45:14.00 oMBTUypS.net
標準理論なんてインチキだからね。
破綻しまくりで意味がなくなってる。
今は廃墟に屋上屋を重ねている段階。
なんだ、超対称性粒子ってｗ
都合のいいものを出してくるな！
15:名無しのひみつ
18/02/10 08:52:13.94 1hAZ/f7M.net
銀河団からの3.5keVのX線がダークマターの崩壊ではなく
２段階でダークマターが対消滅する事で上手く説明できるモデルができたよー
ダークマターは軽いフェルミオン（ステライルニュートリノ？）で
軽いと上手く説明出来ない部分もこれなら大丈夫、って言ってるのかな
標準模型はニュートリノの質量をはじめ色々説明出来ないからなあ
16:名無しのひみつ
18/02/10 08:53:01.44 w31JknYZ.net
スレタイで解説してくれてありがとう
だが、翻訳は自分でしなければならない
17:名無しのひみつ
18/02/10 08:56:27.82 DYgYn1lU.net
グーグル翻訳で翻訳したら卵の数が・・・