Survey Finds No Hint of Dark Matter Near Solar System

Eponymous Hero writes "Does dark matter exist or doesn't it? It seems these results don't shed as much light as we'd hoped. 'Moni Bidin says he's not sure whether dark matter exists or not. But he says that his team's survey (PDF) is the most comprehensive of its type ever done, and the puzzling results must be reckoned with. "We don't have a good comprehension of what is going on," he says.' This has the smell of a Neutrinogate scandal, but at least we've been warned about the shoulder shrugging. 'As an example, Newberg notes that the researchers assumed that the group of stars they examined were smoothly distributed above and below the plane of the Milky Way. But if the distribution turns out to be lumpier, as is the case for stars in the outer parts of the galaxy, then the resulting calculations of dark matter density could be incorrect. Flynn agrees that there are a number of ways that the method employed by Moni Bidin and his co-authors "could get it wrong."'"

Comments

Re:Of course it exists

[wisnoskij]

We have seen its effect on the solar system but I don't think we have any really evidence for what exactly Dark Matter is?
Is it matter? is it particles?
We have theories on what Dark Matter is, but those theories could be completely wrong.

So dark matter, as we know it, might not exist, all we know is that something is causing the effects that we see.

Re:Of course it exists

[rainmouse]

We have so much evidence about the existence of the dark matter that's not even funny: https://en.wikipedia.org/wiki/Dark_matter#Observational_evidence

All indirect evidence. Personally the idea of an invisible, intangible, ethereal magical material that helps peoples sums add up is dubious at best. There are plenty of other good theories out there that do not include this populistic hypothesis.
such as http://www.springerlink.com/content/g332701735121773/

It's depressing...

[StevenMaurer]

...to see so many ignorant posts following up yours, clearly having not even read the article, being modded up - while your reference is stuck at a "1". Just to correct rainmouse's claim of mere "indirect" evidence, here is a quote from the link you provided:

The most direct observational evidence to date for dark matter is in a system known as the Bullet Cluster. In most regions of the universe, dark matter and visible material are found together,[33] as expected because of their mutual gravitational attraction. In the Bullet Cluster, a collision between two galaxy clusters appears to have caused a separation of dark matter and baryonic matter. X-ray observations show that much of the baryonic matter (in the form of 107–108 Kelvin[34] gas, or plasma) in the system is concentrated in the center of the system. Electromagnetic interactions between passing gas particles caused them to slow down and settle near the point of impact. However, weak gravitational lensing observations of the same system show that much of the mass resides outside of the central region of baryonic gas.

In other words, gravitational lensing of light waves - which is 100% direct evidence of matter - shows a region where there is matter that is clearly non-baryonic (i.e. does not interact with the electromagnetic field, a.k.a. "dark"). This is not subject to dispute. The question of what, exactly, is dark matter - is indeed still a subject of scientific research. There are, however, a number of super-symmetric theories which posit super-partners for well known particles, the most stable of which turn out to have the exact characteristics we're noting observationally. It is important to note that these theories were not tailored to account for the dark matter, but seem to fit the observational evidence quite well so far. As with all science however, theories are subject to falsification at any times as soon as new evidence comes on the scene.