How long do black holes last
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Lifespan of Black Holes: An Overview
Quantum Effects and Black Hole Evaporation
Black holes, despite their seemingly eternal nature, do have a finite lifespan. Quantum gravitational effects, although typically negligible in the formation and evolution of black holes, can accumulate over time to produce significant effects. These effects lead to the emission of particles such as neutrinos and photons, a process known as Hawking radiation. As a black hole emits this thermal radiation, it loses mass, which in turn increases the rate of emission. This feedback loop results in a finite lifespan for black holes, estimated to be around (10^{71} (M_{\odot}/M)^{-3}) seconds for a black hole of solar mass, which is much longer than the current age of the Universe .
Relativistic Lifetimes of Spinning Black Holes
The lifespan of black holes is also influenced by their mass and spinning velocity. According to a model proposed by Stephen Hawking, the relativistic lifetime of spinning black holes can be expressed as (\Gamma = 2.098 (M/M_{\odot})^3 \times 10^{67}) years. This indicates that more massive and faster-spinning black holes have significantly longer lifetimes .
Primordial Black Holes and Their Longevity
Primordial black holes (PBHs), which are hypothesized to have formed in the early Universe, present another interesting case. PBHs with masses less than (10^{15}) grams would have already evaporated by now due to Hawking radiation. However, those with larger masses could last much longer. In an ever-expanding universe dominated by dark energy, PBHs with solar surface temperatures could serve as steady power sources for up to (10^{32}) years, making them potential candidates for sustaining long-lived living systems .
Conclusion
In summary, the lifespan of black holes varies significantly based on their mass, spin, and formation conditions. While stellar-mass black holes can last far longer than the current age of the Universe, smaller primordial black holes may have already evaporated. The interplay of quantum effects and relativistic factors plays a crucial role in determining the ultimate fate of these enigmatic cosmic objects.
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Primordial black holes as heat sources for living systems with longest possible lifetimes
Primordial black holes, with solar surface temperatures, could provide a steady power source for long-lived living systems in an expanding universe, potentially enabling exobiological life.
A star in a 15.2-year orbit around the supermassive black hole at the centre of the Milky Way
The star closest to Sagittarius A* is on a bound, highly elliptical orbit around the Milky Way's supermassive black hole, supporting the existence of a central mass composed of (3.7 1.5) 106 solar masses.
Probing planetary-mass primordial black holes with continuous gravitational waves
Primordial black hole binaries in our galaxy may produce detectable gravitational waves, potentially constraining the fraction of dark matter they compose with current detectors and improving with the Einstein Telescope.
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