[ExI] Fermi Paradox and GRB bursts

[Anders Sandberg]

BillK <pharos at gmail.com> , 6/10/2014 12:26 PM:

Beam angle is important and there appears to be quite a wide 
variation, though mostly seem to be concentrated around 4 degrees. 
I took that into account. Power-law distributed beam angles fitted to the data in the paper I quoted, with a range set by when the fluence is equal to 100 kJ/m^2. 
If you reduce the area of the sky you irradiate from all of it to a fraction f, then your range of deadliness (or just detectability) scales as 1/sqrt(f). And the total volume scales as sqrt(f) - the more narrow bursts cover fewer stars despite their huge range.


Anders Sandberg, Future of Humanity Institute Philosophy Faculty of Oxford University
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