Most notably, we find that, under no circumstances, the black holes would reach the (hazardous) regime of Bondi accretion.
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Also note that the evaporation rate grows with M faster than the accretion rate, which implies that the black hole cannot accrete indeﬁnitely.
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The ﬁrst important result is that the black hole decays instantly (i.e., the decay time is shorter than 10^−10 sec) after being created for 0 < β < 1 and 1.25 ≲ β
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First, we found that tidal black holes would evaporate (almost) instantly, except for 1 < β ≲ 1.25. (The particular case with β = 1 was studied in Ref. [14].) Two distinct regimes were then taken into consideration inside this range: large initial momentum, and small initial momentum. Numerical data for the regime with large initial momentum are presented in Tables II and III, and show that the black holes with a large value of the initial momentum would cross the Earth in a matter of seconds and come out with velocities much larger than the Earth’s escape velocity. Their mass, after crossing the Earth, is of the order of 10^−22 kg, after which accretion turns oﬀ, and the black holes just evaporate. If the black holes are created with a small initial momentum, it is possible that they are trapped inside the Earth. However, Table I shows that the maximum mass decreases for decreasing initial momentum. Therefore, the absolute maximum mass is reached for the maximum initial momentum which is still small enough to allow for trapping. Tables IV and V then show that, for black holes trapped inside the Earth, after a time comparable with the age of the present Universe, the mass is on the order of 10^−14 kg, which is still negligibly small.