Trying to understand Primordial Black holes

[justinater22]

I understand that these black holes would be smaller and would have little effect even going through the Earth. I am curious why it would not effect Earth very much and yet leave a mark if passing through a star. Also I am curious about different ideas of how they were formed (if they even do exist). From my understanding is that they are not normal black holes from supernovae but from higher density at certain points towards the begining of the universe. If they do exist what would it mean for us? Would it help prove string theory?

 

Thanks

[ACG52]

If they originally existed, they have long since dissipated due to Hawking radiation. The smaller the BH the higher the 'temperature' and the more rapidly it dissippates.

[justinater22]

But is it possible that it was big enough to still be lasting today? Very small but could it be possible?

[ACG52]

It's unlikely, but I suppose possible. But again, the smaller the hole, the faster it dissapates.

[justinater22]

I thought once it gets smaller it takes even more time to disapate.

[ACG52]

I thought once it gets smaller it takes even more time to disapate.

 

Nope, the smaller the BH, the higher the temp and the faster it dissapates.

[imatfaal]

 

Nope, the smaller the BH, the higher the temp and the faster it dissapates.

 

Exactly - and, of course, thats a positive feedback system.

 

Here is a lovely black hole size/radiation/age calculator

 

http://xaonon.dyndns.org/hawking/

[justinater22]

 

Nope, the smaller the BH, the higher the temp and the faster it dissapates.

 

Oh thanks for clearing that up.