A new study explores the lethal potential of primordial black holes, theoretical objects from the early universe.
In 1974, science fiction author Larry Niven wrote a murder mystery with an intriguing premise: could you kill a man with a miniature black hole? I won't spoil the story, although I'm willing to wager most people would argue the answer is undeniably yes. Intense gravity, tidal forces, and the event horizon would undoubtedly lead to a gruesome end. On one hand, it's evident that a sufficiently large black hole could prove fatal.
On the other hand, a black hole with the mass of a single hydrogen atom is clearly too diminutive to be noticeable. The real question lies in the critical mass. At what minimum size would a black hole become lethal? This is the focal point of a recent study published in The Astrophysical Journal. The study investigates primordial black holes, theoretical entities that might have formed in the universe's earliest moments and would be significantly smaller than stellar-mass black holes, ranging from the mass of an atom to several times the mass of Earth. While astronomers haven't discovered any primordial black holes yet, observations do eliminate several mass ranges. For instance, any primordial black hole smaller than 10 kilograms would gravitationally lens stars in the Milky Way. Since we haven't detected these lensing effects, they must be exceedingly rare, if they exist at all. Therefore, the study concentrates on this mass range and examines two effects: tidal forces and shock waves. Tidal forces arise because the closer you get to a mass, the stronger its gravitational pull. This means a black hole exerts a differential force on you as you approach it. The question is whether this force differential is strong enough to tear flesh apart. Asteroid-mass black holes are less than a micrometer across, so even the tidal forces would affect a minuscule area. If one passed through your torso or a limb, there might be some localized damage, but nothing fatal. It would be akin to a needle piercing you. However, if the black hole traversed your head, that would be a different scenario. Tidal forces could rip apart brain cells, which would be far more serious. Since brain cells are delicate, even a force differential of 10 – 100 nanonewtons might prove lethal. But that would require a black hole at the upper end of our mass range. Shockwaves would pose a significantly greater danger. As a black hole entered your body, it would create a density wave that would propagate through you. These shockwaves would physically damage cells and transfer heat energy, causing further harm. To generate a shockwave of energy comparable to that of a 22-caliber bullet, the black hole would only need a mass of 1.4 x 10^-18 kilograms.So, yes, a primordial black hole could theoretically kill you. While this makes for a captivating narrative, it's highly improbable in real life. Even if asteroid-mass primordial black holes exist, the sheer number of them compared to the vastness of space means the likelihood of encountering one in your lifetime is less than one in 10 trillion
BLACK HOLES PRIMORDIAL BLACK HOLES GRAVITY TIDEAL FORCES SHOCK WAVES
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