<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_extra"><div class="gmail_quote">On Wed, May 25, 2016 at 4:33 AM, Anders <span dir="ltr"><<a href="mailto:anders@aleph.se" target="_blank">anders@aleph.se</a>></span> wrote:</div><div class="gmail_quote"><br></div><div class="gmail_quote"><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
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<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">> </div>Likely just to annoy John, there is a recent paper (
<a href="http://arxiv.org/abs/1603.08522" target="_blank">http://arxiv.org/abs/1603.08522</a> ) 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.</div></blockquote><div><br></div><div><div class="gmail_extra" style="font-size:12.8px"><div class="gmail_quote"><span class="im"><div><br></div></span><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"><font size="4">Maybe early gas clouds did collapse to form Black Holes, but those types of Black Holes can't be Dark matter because those gas clouds were made of </font></div><font size="4">baryonic matter<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> and we know from </div>nucleosynthesis<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> that there was never nearly enough </div>baryonic matter<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> to account for Dark Matter. And it's hard for me to believe that </div>baryonic matter<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> can account for the Black Hole pair that LIGO found either.</div></font></div><div><p><font size="4"></font></p><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"><font size="4">A</font></div><font size="4"> <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">Black Hole pair like the one LIGO found has</div> existed for 13.8 billion years<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">,</div> but it only made enough noise for LIGO to hear it for a fifth of a second, and yet LIGO managed to hear such a pair after just a few weeks of listening. And it had not even reached it's full sensitivity yet. Either the LIGO people were extraordinarily lucky or there are one hell of a lot of Black Holes out there, perhaps enough to account for Dark Matter. LIGO goes back online in September <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">(and will be joined by VIRGO) </div>so we should <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">be able to straighten out what's going on</div> before the end of the year.</font><p></p><p></p><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"><font size="4">John K Clark </font></div><br><p></p><p></p><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div></div></div></div></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div bgcolor="#FFFFFF" text="#000000"><div><div class="h5"><br></div></div></div></blockquote></div></div></div>