Physicist Tiny looking for dark matter in dark black holes


On the night of November 23, 2014, a powerful telescope on Mauna Kea in Hawaii was carrying out esoteric movements of a black hole trying to travel from space. In the seven hours since the telescope attacked the universe, it may have caught one, as a structure about the size of Earth has eclipsed a star about 2.5 million light years away in our nearest galactic neighbor, Andromeda. Among the 188 relatively blurred images taken in the galaxy that night, the candidate black hole event was the literal moment of light.

“When along the line of sight, light bends around [the black hole]. Not only do the rays of light point to being with you, but also those that go past your past, ”Alexander Kusenko, astrophysicist at UCLA and the Kavali Institute for the Physics and Mathematics of the Universe, says in a video. “This will make the star look great for a second. It’s a bit upside down.”

Kusenko is the lead author of a paper recently discussing this incident Published in the journal Physical Review Letters In October. Research suggests that some and all of the dark matter between the universe can be interpreted by primordial black holes – presumed petty and very ancient versions of the classic cosmic character that were just First time imaged directly In 2019. All black holes, regardless of their size, are celestial bodies that exert so much gravitational force that nothing, even light, can escape them.

One idea is that, early in the universe, slight density fluctuations in an incredibly condensed universe would have been sufficient to propagate black holes out of pre-stellar plasma, especially if accompanied by massive particles through an unknown force chit chat. (Run-of-the-mill, known black holes are usually formed by the breaking of stars.)

“If you take a spoonful of primordial plasma, it’s almost a black hole,” Kusenko said, referring to the initial density of the universe. “Squeeze it a little, and the light won’t escape.”

Some of these theoretical black holes will be of some significant size, according to Einstein’s theory of gravitation, considered as a constant expansion for an observer within the black hole – while remaining a constant size for the outer observer. This idea may give rise to perceptions of the “Baby Universe” within us, but keep in mind that primordial black holes themselves are only theoretical for the time being.

And that is the immediate concern of Kusenko’s team: proving their existence. The primordial black hole must have been numerous for some amount of the universe’s dark matter – the mysterious stuff that makes up about 27% of the universe – but is too small to detect, as do their athletic counterparts.

Shortly after the Big Bang, the conception of the artists of the Bal universe ceased.

Shortly after the Big Bang, the conception of the artists of the Bal universe ceased.
The image: Kavli Institute for Physics and Mathematics of the Universe

Kusenko and his colleagues (the October paper included researchers from UCLA and Kavli IPMU) are laying a wide net for black hole candidates using hyper superim-cams, a nearly 6-foot-long lens barrel attached to a 30-foot mirror. Subaru Telescope on Mauna Kea. The camera is capable of imaging the entire Andromeda galaxy every few minutes. Since a seven-hour tour of the Cosmos in 2014 excluded a candidate for a primary black hole, Kusenko hopes future observations will be able to gather more events to unpack.

The 2014 overview was not easy to find in all data. That team narrowed down a list of more than 15,000 candidate stars to check for light combat, and in the process found, among other things, about 50 “impatient” incidents caused by bright stars. An impulse was also due to a passing asteroid. But after sorting too many stars, one candidate seemed aloud.

If more candidate events are identified, the team will have more runway for the theory of accounting for many small black holes Extreme gravity Measured in many galaxies (it is this extra gravity that drove scientists away from the existence of dark matter in the 1970s). To put things in perspective, the smallest known black holes are within the radius of 5 solar masses (that is, five times the size of the Sun). The recent candidate black hole was just the size of our planet.

If an Earth-sized black hole seems hard to believe, well, it’s not even the smallest proposed black hole. Last year, physicists suggested a Bowling ball shaped black hole To explain an imaginary object in our solar system known as Planet Nine.

Kusenko’s team made another round of comments at Mauna Kea in late 2020 and they must now do the laborious task of transferring through data. We can know at the end of this year if they have found a possible black hole-And our fingers cross firmly for good news.

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