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All rights reserved. Black holes are points in space that are so dense they create deep gravity sinks. Beyond a certain region, not even light can escape the powerful tug of a black hole's gravity. And anything that ventures too close—be it star, planet, or spacecraft—will be stretched and compressed like putty in a theoretical process aptly known as spaghettification. There are four types of black holes : stellar, intermediate, supermassive, and miniature. The most commonly known way a black hole forms is by stellar death. As stars reach the ends of their lives, most will inflate, lose mass, and then cool to form white dwarfs. But the largest of these fiery bodies, those at least 10 to 20 times as massive as our own sun, are destined to become either super-dense neutron stars or so-called stellar-mass black holes. In their final stages, enormous stars go out with a bang in massive explosions known as supernovae. Such a burst flings star matter out into space but leaves behind the stellar core.
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Maybe a black hole leads to a white hole

Most of the matter in the Universe is dark, and its composition remains a mystery. The idea is not new, but it has seen a huge resurgence with the recent gravitational-wave observations of black holes. Support among cosmologists for the black-holes-as-dark-matter hypothesis has been mixed, with some researchers seeing black holes as the cure for a number of outstanding issues in cosmology and others pointing to astronomical observations that constrain black hole numbers. The ongoing debate between these two sides, regardless of its outcome, is pushing researchers to more carefully examine the available data. However, searches for these particles continue to come up empty, opening the door to alternative possibilities. To account for the dark matter, cosmologists need a separate population of black holes that formed long before stars. Things changed in , when the LIGO-Virgo collaboration reported the first detection of gravitational waves, and the source was a binary black hole merger see 11 February Viewpoint. The sizes of these black holes around 30 solar masses were slightly larger—and their rotation rates were slower—than expected from stellar models, so many theorists began considering a primordial origin. The basic recipe for making primordial black holes is actually pretty simple: all you need is a region in the very early Universe with a density that is roughly twice the average density, and gravity will do the rest. The problem is making the overdense region in the first place: the early Universe appears to have been very uniform—at least on the large scales that astronomers can see by observing the cosmic microwave background CMB.

Most of the matter in the Universe is dark, and its composition remains a mystery. The idea is not new, but it has seen a huge resurgence with the recent gravitational-wave observations of black holes. Support among cosmologists for the black-holes-as-dark-matter hypothesis has been mixed, with some researchers seeing black holes as the cure for a number of outstanding issues in cosmology and others pointing to astronomical observations that constrain black hole numbers.

The ongoing debate between these two sides, regardless of its outcome, is pushing researchers to more carefully examine the available data. However, searches for these particles continue to come up empty, opening the door to alternative possibilities. To account for the dark matter, cosmologists need a separate population of black holes that formed long before stars. Things changed in , when the LIGO-Virgo collaboration reported the first detection of gravitational waves, and the source was a binary black hole merger see 11 February Viewpoint.

The sizes of these black holes around 30 solar masses were slightly larger—and their rotation rates were slower—than expected from stellar models, so many theorists began considering a primordial origin. The basic recipe for making primordial black holes is actually pretty simple: all you need is a region in the very early Universe with a density that is roughly twice the average density, and gravity will do the rest. The problem is making the overdense region in the first place: the early Universe appears to have been very uniform—at least on the large scales that astronomers can see by observing the cosmic microwave background CMB.

However, theorists have devised models of the early Universe that can generate large density fluctuations at small scales, while still matching CMB observations. It predicts that the early Universe spat out large numbers of primordial black holes with a wide range of masses.

For example, the merging of some of these primordial black holes might explain the high numbers of supermassive black holes observed at large distances in x-ray studies. Primordial black holes might also play a role in generating the fluctuations measured in the cosmic infrared background [ 2 ].

But of course, the most exciting possibility is that primordial black holes are numerous enough to account for the dark matter.

But he adds that the separations are so large that the probability of a black hole coming near our Solar System is very small. Still, these black holes should occasionally run into things, in particular, each other.

The LIGO-Virgo detections of black hole mergers—five so far—are evidence of a large population of black holes in the 10 solar-mass range. But whether or not this population could be large enough to constitute the dark matter is still under debate. Recent calculations have shown that if dark matter were made up of black holes weighing between 10 and solar masses, then LIGO should have detected hundreds more mergers in its first run [ 3 ].

One of these caveats relates to clustering. He believes that gravitational perturbations within these groups would lower the overall merger rate, but the full effect of clustering is still a domain of active research [ 4 ].

But there are other reasons to question whether black holes are viable contenders for the mantle of dark matter. Researchers have set bounds on how much of the dark matter could be in black holes based on a variety of data, such as CMB observations [ 5 ] and stellar density profiles of dwarf galaxies [ 6 ].

One of the earliest constraints came from surveys that searched for the temporary brightening of stars that occurs when a black hole passes between a star and Earth—a so-called gravitational lensing effect. A new study of lensing of supernovae claims to rule out black holes weighing more than 0. Many other researchers have come down on one side or the other of that fence. In fact, the answer may be something in between, with black holes providing some portion of the dark matter and the rest being accounted for by some sort of new particle, he says.

Ten years of observations from the IceCube detector show that researchers are closing in on identifying the astrophysical sources of high-energy neutrinos. Following recent gravitational-wave detections, black holes have emerged as a possible, though contentious, dark matter candidate.

Cosmology Astrophysics. Astrophysics Synopsis: Possible Neutrino Sources Peek out of IceCube Data February 6, Ten years of observations from the IceCube detector show that researchers are closing in on identifying the astrophysical sources of high-energy neutrinos.

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