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On 2016-02-11 17:50, spike wrote:<br>
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<span style="color:#1F497D">Anders, cool, but we need to know
how GW energy would interact with matter before we conclude
that it would nuke biomes.</span><br>
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<br>
OK, I was using the normal style of energy estimates used in
supernova xrisk considerations.<br>
<br>
Now, for gravitational waves being lethal, the strain must
presumably be large enough to cause induction of forces that are
damaging. To a ~1 m object like a human, you probably need a strain
on the order of more than 1/100 to induce damage (1/10 seems really
likely to do it). The strain scales as 1/r, so given that the
detected strain here was on the order of 10^-19, we get dangerous
strain when 10^17 times closer to the source (which is at around 410
Mpc). That is, we get dangerous strain within <span class="cwcot"
id="cwos">126,526 kilometers. <br>
<br>
So I would not worry about gravity waves. <br>
<br>
<a class="moz-txt-link-freetext" href="http://arxiv.org/abs/0911.3889">http://arxiv.org/abs/0911.3889</a> has some estimates for EM effects,
which look like they are 10^-13 times the gravity waves. So that
looks pretty safe: about a year of solar energy output per solar
mass radiated away as gravity waves. Presumably this could scale
up if the EM environment near the holes was stronger. <br>
</span><br>
<br>
<pre class="moz-signature" cols="72">--
Anders Sandberg
Future of Humanity Institute
Oxford Martin School
Oxford University</pre>
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