Shulou(Shulou.com)11/24 Report--

The recent news that a black hole is a source of dark energy has attracted a lot of attention, saying that astronomers have found evidence that the source of dark energy is a black hole for the first time based on observational data. Two related papers have been published in the February 2023 issue of Astrophysical Journal and Astrophysical Journal KuaiBao.

When it comes to dark energy, isn't Euclid's mission to find dark matter and dark energy? so I specifically asked @ _ Yuzheng _ who was involved in the project to see what their industry thinks of it.

We've talked about dark energy before, so I'm not going to repeat it here. To put it simply, we found that the expansion of the universe was accelerating in our observations, so we had no choice but to add an "unknown term" to the original equation to balance the equation. Because we don't know what it is, we call it "dark" energy for the time being.

We know very little about dark energy at present. At least we can see it indirectly through the gravitational effect and infer where it is, but dark energy is really like a ghost hidden in the universe, and we know from all sorts of signs that there should be such a thing, but we have no idea where it is or what it is.

Dark matter simulations this time, the researchers think they may have found the ghost's hideout, a black hole. The theory also became the first theory to explain the origin of dark energy without introducing additional new physics.

It needs to be emphasized that the theory is not based on the results of theoretical calculation, but on the reverse conjecture based on solid observational evidence. Does this mean that this is really a reliable discovery? That depends on what the study says.

We know that black holes can be divided into constant star black holes (SBH) with tens of times solar mass, intermediate mass black holes (IMBH) with hundreds or even tens of thousands of times solar mass, and supermassive black holes (SMBH) that can reach billions of times of solar mass. One of these black holes is still puzzling: supermassive black holes located at the center of galaxies.

Whether they are constant star black holes or medium mass black holes, their growth usually depends mainly on the accretion of matter or the annexation of other black holes.

Constant black holes accrete companion stars, but for black holes at the center of galaxies, especially supermassive black holes with billions of times the mass of the sun in giant elliptical galaxies, they are so big that 13.8 billion years from the birth of the universe to the present is not enough to form such a big black hole.

Pictures of M87 central black holes have been troubling astronomers for the problem that the size of supermassive black holes is growing too fast. For this reason, many people have put forward various speculations: some say that the predecessor of this kind of black hole may be a supermassive star (some people call it a "black hole star"). It is also said that it is formed by the collective collapse of a supermassive star cluster of millions of stars, and even that it may have evolved from the seeds of a black hole formed by dark matter. There were different opinions for a time.

Anyway, there is no final conclusion, so we might as well guess: does the rapid growth of supermassive black holes have anything to do with the accelerated expansion of the universe?

So the researchers started with the problem, first abandoning the current traditional black hole model. This kind of black hole is not a perfect model because of its singularity. They chose some singularity-free black hole models whose mass can vary with expansion and time (similar to cosmological redshift), so that the growth of black holes does not depend solely on accretion and merging. They call this model the "cosmological coupling" model.

Then they tested the cosmological coupled black hole model. They're in z.

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