<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jan 23, 2020 at 4:41 PM Stuart LaForge via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a>> wrote:</div>
<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><i>
<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">> </span>I don't see how an isotropic gravitational collapse could cause <br>
gravitational waves. I thought the generation of gravitational waves <br>
required a dipole or quadripole or some kind of asymmetry.</i></blockquote><div><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="4">True, the collapse would have to be very asymmetrical , and I admit that seems a bit unlikely.</font></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><i>
<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">> </span>But if it wasn't a failed supernova, then I have no idea what could <br>
have caused such a short powerful burst of gravitational waves. Very <br>
mysterious indeed.</i></blockquote><div><br></div><div class="gmail_default" style=""><font face="arial, helvetica, sans-serif"></font><font size="4">I was thinking maybe 2 sub solar mass Black Holes coalescing. That would be really cool if true. Black Holes that small would pretty much have to be primordial, I can't think of anything except the Big Bang itself that would have conditions extreme enough to produce them.</font></div><div class="gmail_default" style=""><font size="4"><br></font></div><div class="gmail_default" style=""><font size="4"> John K Clark</font></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
</blockquote></div></div>