What is Dark matter is it of a 3 dimensional world or what?

Question

Dark matter is one of the universes newest phenomenom is it something or in the realm of nothingness which in itself is another question. What is nothingness no time no space no matter no nothing think about it it boggles and eludes the mind doesnt it?

Answer 1

Okay, the reason dark matter is called that is because we know for a fact that it does not interact with any of the forces with the exception of gravity (ie: it doesn't interact with E/M so no light can "shine" on it). We're not entirely sure what it is after that. There are a few candidates, and a couple of them include contributions from some pretty wild (super-symmetry and such) sources, but some people think it may be concentrated in matter we can't readily see (brown dwarfs).

It is *not* a common anti-particle.

In general it's divided into two regimes (both of which are theoretically contended): cold and hot dark matter. The "temperature" just refers to whether or not they move at relativisitic speeds. All these factors have an effect on galactic formation and evolution, as well as the expansion of the universe.

Answer 2

Dark matter could be anything but it is generally believed to be matter which neither reflects light or transmits light of its own. The only thing it appears to react to, or generates, is gravity. Theory abounds with what it could actually be.....from WIMPs (Weakly Interactive Massive Particles), MACHOS (Massive Astronomically Compact Halo Objects), Neutrinos, and a raft of other stuff. Including exotic manifestations such as "shadow matter" or matter in a different dimension close by our own.

Although it could even be that we may have to modify our laws of physics to account for the observations that have been made which show its presence. An example of this is MOND or Modified Newtonian Dynamics and its relativistic equivalents such as TeVeS (Tensor Vector Scalar). Therefore it is possible that what we are calling "Dark Matter" is nothing more than gravity working under conditions which are a modification of what we see as being normal, and needs a modified law to explain its operation under those conditions. In the case of galaxies and dark matter, a non discrete source of gravitation and low acceleration vectors.

Answer 3

The best explanation that I have heard for dark matter was given by Dr. Micheal Turner at Purdue's Centennial Grande Finale Symposium in 2005. In his lecture he first showed two slides that gave two current theories that could explain Dark Matter and and Dark Energy. Then he showed a third slide. It was a picture drawn by his young daughter (or was it a son). He had asked his kid to draw what she thought dark matter was. Then he said all three theories were equally possible. The point he was making was that we really don't know what dark matter and dark energy are. We just know that the universe is expanding in a way that we can not explain.

Just so you know Turner is the guy her coined the phrase "Dark Matter".

Also Dark Matter is not anit-matter.

Answer 4

I believe that dark energy and dark matter may constitute other
dimensions within our own known universe..
It is to one of these supposed 11 other dimensions that photons
disappear to when they are in wave form..
As gravity dimenishes as a result of our own universes natural
expansion, the gravity pressure is reduced allowing energy from
the dark side ( waited a long time to use that term ! ) to bleed over from the other dimensions which is filling empty space and pushing matter from our universe apart..
This dark matter may or may not turn out to be anti-matter.

Answer 5

hi Honesty. Iam leaning on your thinking. besides the undeniable fact that I wont fake to understand the length situation as its all somewhat complicated and that i became never good at maths. i'm of the perception that in case you communicate approximately string thought (which i do no longer totally understand ) there ought to in basic terms be 3-5 Parallel universes - i'm uncertain what number dimensions that should create. So your asserting what the "something" dark matter is in fact the different dimensions definite to me this is clever. i'm of the thinking that dark matter is the different of light -each little thing has an opposite top ? in keeping with possibility then using that equation theres in basic terms 2.5 Parallel universes the different 2.5 being the different or destructive universes to our Universe in step with a max of 5 Parallel universes. in keeping with possibility theres in basic terms 3 universes a million useful (ours) and one destructive (opposite) universes and the 0.33 is the lacking link between the two that different length exist ? (dark matter) this is all conjecture as i do no longer pocess the mathematical ability to make this right into a creditable equation. i think of its good for guy-style to think of outdoors the field because it have been to think of the unthinkable.

Answer 6

There are many reasons to believe that the universe is full of "dark matter", matter that influences the evolution of the universe gravitationally, but is not seen directly in our present observations.



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FIGURE: Superposed on an optical picture of a group of galaxies is an X-ray image taken by ROSAT. The image shows hot gas (which produces X-rays) highlighted in false red color (Ref). The presence of this confined gas indicates that the gravity in groups and clusters of galaxies is larger than that expected from the matter that we can observe in those galaxies.
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The adjacent image exhibits one recent piece of evidence for undetected matter: the hot gas seen in the X-ray spectrum would have dispersed if it were held in place only the by gravity of the mass that is producing light in this image (the so-called "luminous mass"). The nature of this dark matter, and the associated "missing mass problem", is one of the fundamental cosmological issues of modern astrophysics.

Hot Dark Matter and Cold Dark Matter
Discussions of dark matter typically consider two extremes
Hot Dark Matter
Cold Dark Matter
Hot dark matter is composed of particles that have zero or near-zero mass (the neutrinos are a prime example). The Special Theory of Relativity requires that massless particles move at the speed of light and that nearly massless particles move at nearly the speed of light. Thus, such very low mass particles must move at very high velocities and thus form (by the kinetic theory of gases) very hot gases.
On the other hand, cold dark matter is composed of objects sufficiently massive that they move at sub-relativistic velocities. They thus form much colder gases. The difference between cold dark matter and hot dark matter is significant in the formation of structure, because the high velocities of hot dark matter cause it to wipe out structure on small scales.


Tutorial on Current Status of Dark Matter
The following is a brief tutorial on this issue (Source):
If inflation is correct the density of the Universe should be exactly the closure density. Luminous stars and galaxies contribute only about 0.5% of the closure density, so 99% of the Universe is in the form of dark matter. We may speculate on what particles could make up this dark matter.

The known neutrinoes have problems as candidates for dark matter because they are relativistic (hot dark matter) and therefore they erase fluctuations on small scales. Thus, relativistic neutrinos could form large structures like superclusters, but would have trouble forming smaller structures like galaxies. These arguments might be at least partially invalidated if one of the types of neutrinos (the tau neutrino is the obvious candidate) is considerably more massive than the electron or muon neutrino.

On smaller scales such as galaxies and clusters of galaxies, dynamical estimates of the mass based on rotation curves or velocity dispersions of galaxies indicate that 90% (not 99%) of the total mass is not seen ("sub-luminous"). This implies that the mass density of the Universe is 10% of the closure density. In this case, the sub-luminous mass could be normal (baryonic) and be locked up in stellar remnants (white dwarfs, neutron stars, black holes) or just in very dim stars called "Brown Dwarfs". There is recent evidence for possible observation of one of these very dim Brown Dwarfs.

Although inflation demands that the Universe have a density equal to its critical density (and inflation is necessary to solve certain problems of the standard big bang model like the horizon problem) there has never been any observational evidence to support this high of mass density. Most dynamical studies suggest values of 10-20% of closure density. These studies are based on large scale deviations from Hubble expansion velocities (peculiar velocities).

Large scale structure (e.g. the distribution of galaxies) is very hard to understand, particularly in light of the relatively smooth microwave background as measured by the COBE satellite. One way to accomodate this is to go to a mixed dark matter model in which you have some hot dark matter (for the large scale) and some cold dark matter to act as a seed for galaxy formation. None of those models, however, fit the data using the critical density. The best models to date suggest mixed dark matter and an overall cosmological mass density of 20-30% of closure. Hence, to retain inflation, with its inescapable prediction that the Universe must be flat, requires re-invoking Einstein's cosmological constant - meaning the universe has vacuum energy (negative pressure) and is currently accelerating. This makes our cosmology complicated but much data is pointing this way.

Supernova 1987a neutrino time of flight studies as well as the Solar Neutrino experiment are consistent with the neutrino having a mass, but a very small mass, not one that can cosmologically dominate. We cannot currently test for various supersymmetric particles which would only be created at very high energy (e.g. the early universe) - so there remain many viable potential particles that are consistent with the Standard Model of particle physics, that would remain unnoticed in any accelerator experiments.

Answer 7

anti-matter

Answer 8

it is the oposite of regular matter, everything is oposite, charges, everything