[ExI] Has the mystery of Dark Matter been solved?

[Tomaz Kristan]

> our seeing a black hole merger just a few days after turning on LIGO was
one hell of a stroke of luck.

As I said before. Black holes are raining down to black holes all the time.

Why?

We have at least one billion supermassive black holes around. Each has
already swallowed many million to billion of stars (black holes) just to be
as massive as it is.

It's less than 10^18 seconds since the Big Bang. So one such event per 1000
or there about seconds on average.

It's a question for me however, if there was a detection by LIGO, at all. I
am quite certain that those colliding events are frequent. Much less
certain that we observed one.

On Fri, May 27, 2016 at 7:04 AM, spike <spike66 at att.net> wrote:

>
> >... On Behalf Of BillK
> Subject: Re: [ExI] Has the mystery of Dark Matter been solved?
>
> On 25 May 2016 at 09:33, Anders wrote:
> >>... Likely just to annoy John, there is a recent paper (
> > http://arxiv.org/abs/1603.08522 ) arguing the early supermassive holes
> > could be due to direct collapse of gas clouds. I cannot judge the
> > likelihood of this, but it will be interesting to see how it turns out.
> >
> >
>
> >...Ethan Siegel discusses why black holes = dark matter is unlikely.
> <
> http://www.forbes.com/sites/startswithabang/2016/05/26/black-holes-as-dark-matter-heres-why-the-idea-falls-apart/#687e2a006d7b
> >
>
> ...BillK
>
> _______________________________________________
>
>
> Ja, however... the best way to look at physics theories is to think of
> them as analogous to software.  Many or most of us here have written
> software and gotten it working, then later found it has something in it
> that isn't working right, some subtle remains bug somewhere, and good luck
> finding it.  I must allow the possibility that our current theories on the
> early universe might still have some subtle bug in there somewhere.
>
> Otherwise, our seeing a black hole merger just a few days after turning on
> LIGO was one hell of a stroke of luck.
>
> Unless I misunderstood, LIGO has run a total of 18 days so far, and never
> with full instrumentation (it was a test synchronization with only partial
> capability running last September.)  LIGO isn't going on line at full
> capacity for a few months yet.  So... before I can assume our current model
> is completely correct, I want to wait for at least a couple years of data
> to come in.  My understanding of the abundance of black holes suggests we
> wouldn't be likely to see another event like that again very soon.  So what
> if we turn the thing on and see a merger like that one every couple
> months?  We will be reviewing our notions on early black hole formation.
>
> spike
>
>
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