Dark Matter

The absence of diagrams, the computer you are sitting in, the air you breathe, and even the distant stars are made up of proton electrons and neutrons. For a long time, this general substance, or physicist, likes to weigh the substance, but it is considered to be the main component of the universe. However, evidence has been accumulated over the past two decades Indeed, the universe is ever more strange than it has ever been made up of things that we can hardly see.

The details of this process vary depending on the amount and type of substance in the universe, but cold dark matter, warm dark matter, hot dark matter, baryon substance are divided into 4 types. However, the lambda cold dark matter model (Lambda - CDM), in which the dark matter particles move more slowly than the light velocity, is considered to be the standard model of the big bang cosmology because it is most suitable for existing data. In this model, it is estimated that cold dark matter accounts for about 23% of the material / energy of the universe and baryon material accounts for about 4.6%. Lambda refers to the theory originally proposed by Albert Einstein trying to prove that the balance of the cosmological constant, the mass energy of the universe is static. In this case it relates to the dark energy which helps to accelerate the expansion of the universe and keep its large scale structure roughly uniform.

Familiar substances of the universe called baryon substances are composed of protons, neutrons, and electrons. Dark matter may be composed of baryon or nonbalance. In order to summarize the elements of the universe, dark matter must account for about 80% of the substance. Missing substances are more difficult to detect and may consist of traditional baryon materials. Potential candidates include light brown dwarfs, white dwarfs and neutrinos. Ultra large mass black holes may also be part of the difference. However, these hard to find objects need to play a more important role than what scientists have observed to compensate for the missing mass. On the other hand, other factors suggest that dark matter is more exotic.

In recent years, this problem is controversial. In 2016 - 2017, the idea that heavy dark matter or dark matter is a black hole (including the original black hole) appears again after gravity wave detection results. Although these were excluded again in December 2017, research and theory based on these continue until 2018, and it is not solved including the method of cooling dark matter. Dark matter can be divided into cold, hot and hot. These categories represent the speed rather than the actual temperature and indicate how far the corresponding object has moved away by the random motion of the early universe before it decelerates due to the expansion of the universe.