Comments on: More Hints of Dark Matter

By: The Status of Dark Matter [Starts With A Bang] | Digital Brain ; Science and Technology News

Fri, 21 Oct 2011 20:46:40 +0000

[...] (Image credit: G. Angloher et al., retrieved from Sean.) [...]

By: Dunkel-Materie-Detektion im Keller: Es steht 3:2 … « Skyweek Zwei Punkt Null

Thu, 15 Sep 2011 15:26:24 +0000

[...] Verständnis der Störquellen und signifikantere Signale … Paper von Angloher & al. 4., Cosmic Variance 5., DLF 6., New Scientist, BBC 7., Physics World 8., KosmoLogs 9., Science News 12., Nature News [...]

By: Tissa Perera

Tissa Perera — Wed, 14 Sep 2011 14:59:22 +0000

The GHOST PARTCLE
But Dark Matter is more illusive than Ghosts
Some people some times have seen ghosts, but not this stuff with a big qualification…”so far”.
Dark Matter is most cosmologists play putty. It can be invoked if and when necessary and molded conveniently to accommodate and rectify the observed seemingly abnormal behavior of real matter in order to save Newton’s law of gravity. To explain Dark Matter, certain obvious properties are assigned.
It must be made of some kind of particles not resembling any of the known particles, more akin to neutrinos, but unlike neutrinos, it must have significant mass(hence gravity), must move slow(cold) and hardly interact physically with each other or with real matter(weakly interacting) except via gravity. I do not know why they had to attribute even a weak interaction with real matter, may be they hoped to physically detect it one day like they did with neutrinos. After so many years this stuff still remains to be detected.
The problem with such tenuous matter properties is that it cannot congregate into any significant structure except by gravity, and gravity is already a very weak force. Computer simulations have produced vast web structures of this stuff where real matter is supposed to gravitate at the web nodes. But the visible composite structures(Galaxies etc) are moving in space at tremendous speeds. I do not see how the dark matter web nodes flow with the real matter at these speeds without separation.
Nature may not be that way, how about modifying gravity? I have a different theory of the universe in which an extra cosmic size bounded 4th spatial dimension naturally modifies Newton’s law of gravity at cosmic scales to reproduce and modify the now famous empirical MOND theory. Dark energy becomes a natural consequence of this theory and dark matter is not necessary. This theory basically shows that the so called dark matter is a natural consequence of the bounded curvature of the 4th space where real matter by itself is the cause of so called dark matter. Only gravity can venture into the 4th dimension which I call the dark space. After all, MOND is on the right track and MOND becomes a legitimate theory under this hypothesis.

By: forester

forester — Sun, 11 Sep 2011 04:54:03 +0000

If this is some non-dark matter physical process that CRESST, CoGENT, and DAMA are detecting, then why are both XENON and CDMS not seeing evidence of the same physical process?

I suspect that there is some background affecting the CRESST etc experiments that the XENON and CDMS teams have been able to block out. The problem with this interpretation is that CRESST, CoGENT, and DAMA teams are run by different people and use different equipment and yet they each seem to be pointing to a new particle in a mass-range that’s compatible with one another. In other words, it is not like DAMA sees evidence of a particle at 300 Gev, CRESST sees evidence at 1 mg, and CoGENT at 100 Gev. They all seem to be more or less compatible with one another from a “mass of particle standpoint.”

By: True_Q

True_Q — Fri, 09 Sep 2011 05:20:13 +0000

You’re a Time Lord? The Doctor would be happy to meet You

By: Liten notering om det senaste mörk materia-resultatet | Stjärnstoft och kugghjul

Fri, 09 Sep 2011 04:38:05 +0000

[...] som vill läsa mer redan nu kan börja till exempel med inlägget på Cosmic Variance. Like this:GillaBli först att gilla denna [...]

By: Al

Al — Fri, 09 Sep 2011 02:22:27 +0000

Xenon100 doubles down with a new preprint and new analysis (arxiv, 9/8/11).

They cast considerable doubt on any “WIMP” sightings.

No one really believes the CRESST-II “weak signal amid substantial background noise”.

Nature is not “messing with us”, but some very misguided theoretical physicists might be.

By: Brian137

Brian137 — Thu, 08 Sep 2011 00:53:07 +0000

There might be several types of DM particles.

By: Research shines more light on dark matter

Research shines more light on dark matter — Wed, 07 Sep 2011 21:04:08 +0000

[...] the CRESST experiment suggests dark matter may actually have a lower mass than previous theories.Discover Magazine’s Sean Carroll sums up the current situation best: “either the universe is really messing with us by making [...]

By: Ben

Ben — Tue, 06 Sep 2011 19:53:39 +0000

A fable to read (or re-read) for the CRESST people: “The Boy Who Cried Wolf” by Aesop (620-564 BCE)

By: gameshowhost

gameshowhost — Tue, 06 Sep 2011 17:56:18 +0000

I hear the Tea Party is already staging a protest.

By: Greg Campbell

Greg Campbell — Tue, 06 Sep 2011 17:19:01 +0000

If WIMP mass is 20-40 GeV/c^2, the choice collision detector for selectivity, total active mass on the cheap, and sensitivity is Juan Collar’s supercritical bubble chamber (arxiv:1008.3518) loaded with CCl_3F, (bp 23.7 C, d 1.49 g/cm^3. Boiling point increases with depth given hydrostatic pressure. Large area somewhat shallow containers will also afford directional information vs. time of day and Earth’s orbital direction. Begin synthesis with natural gas for no C-14, half-life 5715 years. Chlorine from salt dome NaCl for no Cl-36, half-life 3×10^5 years versus 150 million years age, 500 half-lives.

Collision energy transfer is maximum when the two bodies have equal mass, as in Newton’s cradle. If physics knows where to look, why doesn’t physics look there?

By: Hebben ze bij CRESST-II aanwijzingen voor donkere materie gevonden?

Hebben ze bij CRESST-II aanwijzingen voor donkere materie gevonden? — Tue, 06 Sep 2011 15:30:58 +0000

[...] DAMA-LIBRA. Zouden toch collega’s moeten zijn, nietwaar? Concullega’s wellicht? Bron: Cosmic Variance. Noot:1 pb=10−36 cm2. [↩]Op indirecte wijze is donkere materie al lang gedetecteerd, o.a. [...]

By: Marc

Marc — Tue, 06 Sep 2011 09:55:15 +0000

So, of CRESST, DAMA, COGENT and CDMSII, we can see that at least two of them must be wrong. DAMA and COGENT are inconsistent, CDMSII and CRESST are inconsistent. And if XENON is right, then all four of those are wrong. Sigh….

By: Lab Lemming

Lab Lemming — Tue, 06 Sep 2011 09:47:51 +0000

What is so special about CaWO4, that makes it a good dark matter detector?

By: Al

Al — Tue, 06 Sep 2011 03:19:50 +0000

Haven’t we been through this about 343 times before?