[ExI] Gravitational Waves Detected By LIGO!
anders at aleph.se
Thu Feb 11 23:28:55 UTC 2016
On 2016-02-11 17:50, spike wrote:
> Anders, cool, but we need to know how GW energy would interact with
> matter before we conclude that it would nuke biomes.
OK, I was using the normal style of energy estimates used in supernova
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 126,526 kilometers.
So I would not worry about gravity waves.
http://arxiv.org/abs/0911.3889 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.
Future of Humanity Institute
Oxford Martin School
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