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12.14. Taking the age of the universe to be ~ 2 1010y, what would have be the initial mass of a primordial black hole (a minihole)-formed from fluctı ations soon after the big bang-for it to explode today? [Answer:10-19 Mo 1014 g.] Astromomers have looked for minihole explosions but found no eviden< of their existence.

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life time os bleckhole is givent, So) 2 X lo , ヲ 10

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