[ExI] Fermi Paradox and GRB bursts

[Tomaz Kristan]

I think that those, who are arguing for a relative low impact of GRBs may
be biased toward championing the common life in the Universe.

Even if a fish in Mariana trench actually survives, there is not enough
time to repopulate the planet, before the central star is either too hot or
too cold.

All the metals we see around are signs of possible GRBs in the past.

Had been no metals around us, GRBs would be rare.

And life also.

You can't live with GRBs and you can't live with them. Almost can't.

On Thu, Oct 2, 2014 at 11:06 AM, Anders Sandberg <anders at aleph.se> wrote:

> Yes, I have read the paper and still remain unconvinced. Destroy the ozone
> layer and the land biosphere is in trouble. But do you really think that
> will wipe out fish all the way to the bottom of the Marianas trench? Their
> conclusion is not compatible with other papers on GRB damage I have read.
>
>
> Anders Sandberg, Future of Humanity Institute Philosophy Faculty of Oxford
> University
>
>
> BillK <pharos at gmail.com> , 2/10/2014 12:25 AM:
>
> On Wed, Oct 1, 2014 at 10:59 PM, Anders Sandberg wrote:
> > I am sceptical of their conclusion. While a GRB no doubt can cause mass
> > extinctions they do not remove biospheres: a few cm of water or rock
> > protects against the radiation in their paper.
> >
> > The GRB rate is also low enough that it cannot cause effective
> > synchronization of advanced life a la the Annis/Cirkovic scenario.
> >
>
>
> The full paper is available as a pdf file here:
> <http://arxiv.org/pdf/1409.2506v1>
>
> I am not a GRB expert, but their paper seems to be thorough. They
> consider the different types and strengths of GRBs and the frequency
> of each type, They say that the main damage is caused by the
> destruction of the ozone layer. Even if the GRB only destroyed higher
> lifeforms, that would be sufficient to leave only bacteria on nearby
> planets.
>
> BillK
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