[ExI] Gravitational Waves Detected By LIGO!

[Tomaz Kristan]

> If they've
​
already collided
​ then it's too late for any detector to see them.​

Yes. But the rate of colliding is at least as big right now. But we fail to
detect them.

Your explanation may be good. But if it isn't, we saw a fluke and there
will no next "Wows". Be patient, as you have suggested, to the end of this
summer.

Stay around, everybody!


On Sun, Feb 14, 2016 at 11:48 PM, John Clark <johnkclark at gmail.com> wrote:

> On Sun, Feb 14, 2016 at 1:56 PM, Tomaz Kristan <protokol2020 at gmail.com>
> wrote:
>
>> > How did you calculate that "
>> at least one every second
>> ​" figure?​
>>
>>
>> ​> ​
>>> 10^11 galaxies with a supermassive black hole.
>>
>>
> ​When a supermassive black hole of millions or billions of solar masses
> forms and goes through it's ring down phase it produces enormously powerful
> gravitational waves but the frequency of the waves is very low, less than a
> tenth a cycle a second, but LIGO is most sensitive when the frequency is
> several hundred cycles a second. So if the black holes is larger than a few
> hundred solar masses LIGO is not going to see it. And even when the source
> produces the right frequency it can't see everything in the observable
> universe, LIGO won't see it if it's too far away.
>
> In a decade or 2 the space based eLISA observatory could detect
> gravitational waves from supermassive black holes, but not LIGO.
>
>
>
>> ​> ​
>> This is about several*10^17 small black holes already collided.
>>
>
> If they've
> ​
> already collided
> ​ then it's too late for any detector to see them.​
>
> ​ John K Clark​
>
>
>
>
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