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Core hints :Editor's note: legendary physicist freeman Dyson proposed the " Dyson sphere" theory as early as 1960. now the research of particle physicist Dan Hooper adds new variables to this theory. perhaps highly developed civilization can resist the

Release date:2018-07-14

Browse number:477

Editor's note: legendary physicist freeman Dyson proposed the " Dyson sphere" theory as early as 1960. now the research of particle physicist Dan Hooper adds new variables to this theory. perhaps highly developed civilization can resist the accelerating expansion of the universe.
When talking about threats to human existence, some of them are bound to be more urgent than others. Disease, nuclear war, famine, asteroid impact: in today's era, everything seems likely to destroy society. These threats have created fear in many people's hearts and minds. this is right.
Among all threats, the last threat is the accelerating expansion of the universe. In fact, so far it has not been explicitly considered a threat.
But today, the situation has changed, at least a little, thanks to the research results of Dan Hooper, a particle physicist at the fermi national accelerator laboratory in Batavia, Illinois. Dan Hooper pointed out that we cannot study, influence, or communicate with things outside the universe's horizon, because that is beyond the maximum distance light can reach between the time when the universe was formed and now.
There may be many things outside the horizon of the universe - stars, galaxies, and even other civilizations. But because the light they emit will never reach the earth, we cannot touch or see them.
But the cosmic horizon is changing. Hooper has studied how this will affect our group in the universe - astronomers call it the " local cluster". This is an aggregate of about 50 nearby galaxies that are bound by gravity in the milky way galaxy and will collide to form a super galaxy at some point in the next trillion years.
Therefore, in the foreseeable future, the " local cluster" may become the home of mankind. In one billion years, we can even develop it into a colony of human beings. human beings hope to transfer from one galaxy to another so as to continuously utilize the energy of the sun in this process.
However, the accelerating expansion of the universe is causing it to launch galaxies at a gradually increasing frequency. Hooper said: " therefore, in the next 100 billion years or so, all stars outside the" local cluster " will surpass the horizon of the universe and not only cannot be observed, but also cannot enter at all. "
This is a question of whether a more developed civilization can be created, because it limits the number of new stars that can continue to be used.
Therefore, Hooper's question is whether advanced civilization can do anything to mitigate the impact of this accelerating expansion of the universe. The answer is: yes.
First of all, we should know some background knowledge. As early as the 1960s, legendary physicist freeman Dyson put forward the " Dyson sphere" theory. he believed that the energy contained in a planet like earth is very limited and is not sufficient to support the development of its civilization to a more developed stage. In a star-planet system, most of the energy from stars is wasted. He speculates that advanced civilizations will try to collect as much energy as possible from their sun. The most obvious method is to completely surround the star with a sphere that can capture all the light, then the energy generated by the star can be used, and the waste heat will radiate into space, like submillimeter wave or infrared light. only in this way can we support this civilization for a long time and make it develop to a sufficient height.
The so-called " Dyson sphere" theory has reached the status of fanaticism. Science fiction writers have written many books about this theory.
More importantly, astronomers have been looking for unique radiation signals that " Dyson sphere" must produce, but so far no corresponding signals have been found.
Hooper's research results add new variables to the story. His idea is that a sufficiently developed civilization should be able to build a sphere that can emit waste radiation in a specific direction. This radiation will accelerate the acceleration of the sphere and the stars it contains in the opposite direction.
With the passage of time, this highly developed civilization can use this technology to collect stars as a source of energy, thus keeping them within the horizon of the universe when it expands.
An important question here is what kind of stars are suitable for this job. Hooper said that large stars often form earlier and are older, so they are more likely to run out of energy when being manipulated. But on the other hand, very small stars produce very little energy, and they cannot accelerate quickly. None of these stars has the ability to move quickly enough to stay within the horizon.
Hooper concluded that stars of the same mass as the sun may be most suitable for such intergalactic transport. He said that gathering stars in this way would increase the energy available to a civilization several thousand times. And this may make their civilization last longer.
Hooper's work has a measurable forecast. If a sufficiently developed civilization has already begun the star collection process, astronomers should be able to observe it. He concluded: " such a civilization may appear in a region surrounded by' Dyson sphere' with a radius of tens of megabytes. most or all of the stars are lighter than' the mass of the two suns'. "
There is no doubt that astronomers are eager to find such signals.
However, Hooper's work depends on two assumptions. First, an advanced civilization will try to maximize the energy it can consume. This is actually not certain. perhaps this advanced civilization can learn how to effectively use what they have at present. But the earth definitely needs it.
The second hypothesis is based on the cosmologist's view that the expansion of the universe is accelerating. In the same way, this is uncertain.
Many researchers are skeptical about the idea that the universe will expand forever, while they are even more disagreeable about the idea that the universe will expand and accelerate. Perhaps the reason why they disagree with the most consideration is that this acceleration violates the principle of conservation of energy, which is the cornerstone of modern physics.
A highly developed civilization is likely to solve this problem. Therefore, in Hooper's assumption, the absence of " Dyson sphere" may only be that our cosmologists have not found the correct evidence.

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