February 27, 2021

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There may actually be small black holes on the outside, and the neutron swallows the stars from the inside

Small, everything but undetectable primitive Black holes May be one of the mysterious sources of the contributing mass The dark thing. Their lifespan in the open has significant limitations, but in recent years, astronomers have asked: What if these black holes were at the center of neutron stars?

Gradually, such black holes attach to the neutron star and swallow it from the inside. These hypothetical systems have not yet been verified, but a new advance sheet, Published on arXiv Has not yet been reviewed and has calculated how long this will take to swallow.

It can be used to analyze the current neutron star population, which controls the nature of black holes that are thought to be candidates for a dark object – although they are primitive, The Big Bang, Or black holes formed within neutron stars.

Although we do not know what the dark matter is, it is very fundamental to our understanding of the universe: the ordinary thing that we can directly detect due to all gravity – the ordinary thing – does not exist. In fact, gravity is about 75 to 80 percent of what scientists have calculated.

There are many candidate particles that can be dark matter. The primitive black holes that formed after the Big Bang were not one of the leading candidates because we would have noticed them now if they had been over a certain mass; But, below that mass, they would have evaporated through the emission Hawking radiation Not so long ago now.

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However, black holes are an attractive candidate for dark matter: they are too Very difficult to find If they were hanging in space doing nothing. So astronomers are constantly looking for them.

An idea recently explored is the endoprosthetic black hole. There are two scenarios for this. For one, primitive black holes were captured by neutron stars and sank in the center. Another, particles of dark matter are trapped within the neutron star; If conditions are favorable, these may come together and fall into the black hole.

These black holes are small, but they are not. From their comfortable position, if the neutron enters the star, these tiny black holes will parasite their host.

A team of physicists from Bodoin College and the University of Illinois at Urbana-Champaign calculated the accumulation rate – that is, the rate at which a black hole swallows a neutron star – for orders of magnitude smaller than the neutron star host.

Neutron stars have a theoretical upper mass limit 2.3 times the mass of the sunTherefore, black hole masses expand across the range of dwarf planets.

For the non-rotating black hole host to the rotating neutron star, the aggregation sphere would be. In the calculated accumulation rates of the team, small holes like 10-21 The mass of the Sun will fully connect a neutron star to the lifetime of the universe.

This suggests that primitive black holes, from the beginning of the universe, are now fully connected to their host neutron stars. These time scales are in direct conflict with the ages of older neutron star populations, the researchers said.

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“As an important application, our results confirm the arguments that use the current existence of neutron star populations to limit the contribution of primitive black holes to the dark matter content of the universe, or to the formation of dark particles’ black centers after capture,” They wrote in their paper.

So the result is another blow to primitive black holes; But it does not completely rule out endoprosthetic black holes. If particles of dark matter float there in space and blunt into neutron stars, they can collapse into black holes and turn neutron stars into black hole objects.

That’s awesome.

The team paper has been published arXiv.