Are black holes and neutrinos dark matter?

Hello: Dark matter: In cosmology, dark matter refers to a substance that does not emit electromagnetic radiation on its own and does not interact with electromagnetic waves.

The part we currently know is only about 4% of the universe, dark matter accounts for 23% of the universe, and 73% is dark energy.

1 Neutrino: Also translated as neutrino, it is one of the most basic particles that make up nature, not dark matter, moving at nearly the speed of light.

2 Black hole: A massive object in the universe predicted by modern general relativity.

Black holes and neutrinos both belong to the generalized understanding of natural matter, and the encounter between dark matter and generalized natural matter will belong to the collision of energy and anti-energy.

It doesn't belong. A black hole is a super-dense, super-gravitational celestial body that evolves into a massive star after aging, and it cannot be seen directly because any matter and radiation cannot escape its gravitational pull, so it is called a black hole. Neutrinos can be detected by reacting with matter that we can see, and now it can be measured.

For the study of dark matter, due to the anomalies in the universe, according to the gravitational force and the continuous cooling of the universe in the process of continuous expansion, it is logical that the expansion of the universe is constantly decelerating, but the actual observation shows that the expansion of the universe has been accelerating. Therefore, there must be something that we are completely unaware of that is sustaining the accelerated expansion of the universe, that is, dark matter and dark energy. Black holes are gravitational, neutrinos do not interact with other matter, and therefore, they do not fit the definition of dark matter.

Some people think that dark matter may be dense objects (machos, such as black holes, white dwarfs, m-dwarfs, etc.), while others (particle physics theory) think that they are "massive and weakly acting particles". This particle has not been caught yet. What exactly dark matter is, I don't know.

While the vast majority of scientists believe that dark matter exists, it is not absolute. There may also be problems with the structure of the universe (metric, I don't know how to translate it).

A black hole is a region of space-time that exhibits a very strong gravitational effect, making it impossible for any particle and electromagnetic radiation, such as photons, to escape from the black hole。According to the generalized theory of relativity, a sufficiently dense mass can bend time and space, thus forming an inevitable regional boundary, which is known as event vision. Simply put, this is the end of the message, and you can't convey the message.

There is no direct evidence of black holes, but we can start by affecting the time and space around them to find indirect evidence of black holes. For example, when a black hole affects surrounding stars, due to the strong gravitational pull of the black hole, the star's material falls into the black hole, and an air coil forms between the black hole and the star. In this process, the material of the star is heated and the energy (X-rays) radiated is observed by us.

What needs to be known here is that no black holes have actually been discovered yet, only candidates for similar black holes have been discovered. A black hole is a massive star above a critical value that "dies" and later forms a star, such as the Sun, that relies on hydrogen fusion to sustain energy.

Then the hydrogen runs out, and due to the pressure of gravity, the core environment turns into helium and begins to fuse. Higher-quality stars fuse nuclei into heavier elements, right down to iron. According to the theory, if the core mass of a star is greater than or equal to that when the mass of the Sun doubles, there is no energy (repulsion) that can resist its own gravity.

Gravity begins to collapse infinitely toward the center, and then forms a "black hole", which is often a singularity at the center. Because a black hole is formed by a large amount of matter squeezed into a small space (called high density in the language of physics), it can generate a huge gravitational force that attracts everything that comes close to it.

The pull it creates is so strong that if you get too close to it, or even try your best to pass it quickly, you will inevitably be sucked over. This is called the surface of a black hole by astronauts, and once it falls on the surface of a black hole, there is no way to escape. The reason why a black hole is called a black hole is because if we take a picture of the black hole, we can't see anything on it, and no light can escape from the black hole, and the principle of the camera is to record the light, and you can only see a black ring around the black hole.

There is no dark matter in the universe that aggregates to form dark matter black holes. Because there is no evidence that dark matter really exists.

Matter becomes invisible once it enters a black hole, but that doesn't mean its impact can't be measured. Black holes still have a gravitational effect due to their mass, just like all other massive objects in the universe. From this we can actually discover and measure the mass of a black hole by observing the effects of surrounding matter on it.

For example, a supermassive black hole at the center of the Milky Way has a strong gravitational pull that causes stars close to its orbit to orbit at high speeds. Based on this fact and the equation that describes the orbit of the star, we can estimate the mass of the black hole.

I think that the words in the universe are also dark matter black holes formed by the aggregation of dark matter, but we do not have a certain understanding of his words.