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Curious layman

Did Astronomers Just Discover Black Holes from the Big Bang?

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Gravitational waves attributed to the collision of two neutron stars could have been produced by something much stranger....

https://www.scientificamerican.com/article/did-astronomers-just-discover-black-holes-from-the-big-bang/?utm_source=quora&utm_medium=referral

 

IMG_3105.PNG.9aa47ae914b8cdc63be77bd149c17ff5.PNG

Snapshot from the central region of a numerical simulation of two merging neutron stars. It shows the stars stretched out by tidal forces just before their collision. Credit: CoRe/Jena FSU

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Interesting, but...

The premise of Primordial Black Holes being responsible for the detected Gravitational waves, is that they can range in size from "a thousand times less massive than the sun to a billion times larger, they could make up all of the universe’s dark matter".

However, PBHs much smaller than a solar mass have definite lifetimes. The smallest would have already evaporated after 13.7 billion years; and certain specific sizes would be evaporating at this time.
When you combine this with the fact that we can look' back' through time at the precedent billions of years by looking billions of light years away, one has to wonder how come we don't see any evidence o PBH evaporation, and the final, tell-tale gamma ray burst, as they 'pop' out of their event horizon in their final moments.

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