What is dark matter and how did it form?

Answer 1

A black hole doesn't cause anything. It is a gravity trap - a place where gravity has gotten so strong nothing can escape (excluding Hawking radiation at the event horizon.) What happens is a star (or stars) is (are) so heavy after burning much of their hydrogen into helium that the star(s) start to collapse in on itself. If there is a certain amount of mass at a certain distance (critical mass) then even light can't escape the gravitational pull and now it is a black hole. Because energy can't just disappear and Hawking radiation exists, after enough time a black hole can expend itself - burned so much matter to energy that it 'dies' - that is it expends the last of it's energy in a humongous burst of radiation - an explosion of light if you will and all that's left are those echoes of it's death.

Answer 2

Personally I believe that dark matter cannot be created or destroyed. Dark matter is, (in theory), an invisible form of matter which makes up around 25% of gravity. To prove that dark matter cannot be created just imagine the ever expanding universe. Even though scientist and physicist say there is nothing beyond the universe, there has to be something for the universe to expand upon, (i.e. open space or a material). Just imagine a road that is expanding. For a road to expand there has to be land for it to expand upon. So in theory there has to be some type of building block for expansion to occur. One such building block could possibly be dark matter. Although other scientists have unproven theories stating dark matter is created by particles, they are just theories.

Answer 3

From disturbances of the dark energy field. Energy = mass (matter) multiplied twice by the speed of light 'c'. Einstein said; "the particle can only appear as a limited region in space in which the field strength or the energy density are particularly high" It seems he was right. What propagates the high density concentration isn't accepted yet, but it's certainly likely to include particles of mass rushing through the field. (look up the quantum clouds of free action particles, growing with motion, in colliders). They can then disappear (be annihilated or 'condense') back into the field, as energy. Their purpose is confidential, but may be announced soon, and some of this is cutting edge stuff a physics masters textbooks probably won't cover anyway!

Answer 4

Theoretically, the physical laws of the universe are such at, immediately following the Big Bang, mass/energy condensed into various forms of matter. Some of that matter is baryonic matter, the stuff that we can see. Most of it, however, is stuff we cannot detect: dark matter.
However due to a lack of empirical evidence, there is are no theoretical conjectures for the formation of dark matter as part of the Big Bang event.
Other Opinion: From an alternate perspective, dark energy is thought to be the original medium of a pre-Big Bang universe. Consequently the Big Bang creation event, via an unfolding of its condition from singularity, introduce the intrusion of our existence: a reality of positive density matter within a traditional fourth dimensional SpaceTime continuum. Considering a pre-Big Bang universe as zero density matter, the intrusion of positive density matter simultaneously provided for introduction of negative density matter (or dark matter). The resulting effect of bringing the universe back into the more ordered condition consistent with its pre-Big Bang persistence is the expanding of the positive density matter within our fourth dimensional universe.

Answer 5

It was pressumably formed during the first few seconds of the Big Bang, together with normal matter. However, very little is really know about dark matter - it is known to exist, due to its gravity, but that's about it.

Answer 6

Dark matter is the term used to describe the hypothetical type of non-baryonic matter rationalized to account for discrepancies between the mass of large astronomical objects, determined from their gravitational effects, and the mass calculated from the "luminous matter" that they contain: i.e. stars, gas and dust. Since there are no empirical evidence to support dark matter, by process of elimination, based in part on the calculations consistent with general relativity, dark matter is estimated to constitute 84.5% of the total matter in the universe. According to the Planck mission team, and based on the standard model of cosmology, the total mass–energy of the universe contains 4.9% ordinary matter, 26.8% dark matter and 68.3% dark energy.

Although the existence of dark matter is generally accepted by the mainstream scientific community, there is no generally agreed direct detection of it. Other theories including MOND and TeVeS, are some alternative theories of gravity proposed to try to explain the anomalies for which dark matter is intended to account. Due to a lack of empirical evidence, there is are no theoretical conjectures for the formation of dark matteras part ofthe Big Bang event.

Other Opinion: From an alternate perspective, dark energy is thought to be the original medium of a pre-Big Bang universe. Consequently the Big Bang creation event, via an unfolding of its condition from singularity, introduce the intrusion of our existence: a reality of positive density matter within a traditional fourth dimensional SpaceTime continuum. Considering a pre-Big Bang universe as zero density matter, the intrusion of positive density matter simultaneously provided for introduction of negative density matter (or dark matter). The resulting effect of bringing the universe back into the more ordered condition consistent with its pre-Big Bang persistence is the expanding of the positive density matter within our fourth dimensional universe.

Answer 7

A black hole is actually a star that has collapsed.

Answer 8

Dark Matter hasnt yet been found, it is only a theoretical construct at the moment.