The hypothetical planet Nine, thought to be lurking somewhere on the outskirts of our solar system, may not be a planet at all. A new study, released on Sept. 24 on the arXiv pre-print server, suggests that the mysterious and still undiscovered object may be the original black hole.
Primordial Black Holes (PBHs) are old and relatively small black holes that appear shortly after the Big Bang. They are thought to have formed as a result of the fluctuations in density in the very early universe. It is estimated that the lowest PBHs have probably evaporated. However, those with larger masses can still exist, evaporating in the current era ̵
Astronomers Jakub Scholz of the University of Durham and James Unwin of the University of Illinois at Chicago assume that PBHs can reside even closer to us than we think. In a recent article, they consider the possibility of the elusive planet Nine, theoretically moving in the orbit of the sun at a distance of between 300 and 1000 AU, to be such an old and compact black hole.
Explaining their intriguing hypothesis, the researchers focus on two unresolved gravitational anomalies of similar mass: anomalous orbits of trans-neptune objects (TNOs) and an excess of microsensing events. The interesting thing is that both events are due to objects with mass calculated between 0.5 and 20 earth masses.
The anomalies of the orbits of the TNO are supposed to be caused by a new gravitational source in the outer solar system. Although it is widely accepted that this source may be a floating free-floating planet, Scholtz and Unwin argue that the PBH scenario is not unreasonable and should be taken into account.
"Capturing a free-floating planet is the leading explanation for the origin of planet nine, and we show that the probability of capturing PBH is instead comparable," astronomers write in the article.
However, it can be difficult to confirmed this theory, since such a hypothetical PBH, with a mass of about five earth masses and a radius of about five centimeters, would have a Hawking temperature of approximately 0.004 K, which would make it colder than the cosmic microwave background (CMB). , radiated only by a typical PBH, is small which h
To overcome this obstacle, the authors of the article propose to look for signals of destruction of dark matter by a microwave around PHB. It is believed that such a halo of dark matter, if destroyed, can provide a powerful signal that astronomers therefore offer dedicated searches for moving sources in X-rays, gamma rays, and other high-energy cosmic rays, which could provide more evidence to support the PHB hypothesis.
Theory proposes that the black holes LIGO / Virgo originate from a first-order phase transition
Jacob Scholz, James Unwin. What if Planet 9 is a primary black hole? arXiv: 1909.11090v1 [hep-ph]: arxiv.org/abs/1909.11090
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Planet Nine may be a primary black hole, new research suggests (2019, September 30)
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