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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> extropy-chat [mailto:extropy-chat-bounces@lists.extropy.org] <b>On Behalf Of </b>John Clark<br><b>Sent:</b> Thursday, November 10, 2016 8:01 PM<br><b>To:</b> ExI chat list <extropy-chat@lists.extropy.org><br><b>Subject:</b> Re: [ExI] LIGO: RE: Hey, look on the bright side<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif'>On Wed, Nov 9, 2016 at 3:13 PM, spike <<a href="mailto:spike66@att.net" target="_blank">spike66@att.net</a>> wrote:<o:p></o:p></span></p></div><div><div><div><p class=MsoNormal> <o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><div><div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif'>> >…</span>if black hole mergers can make this signal, then neutron binaries can too,<span style='font-family:"Arial",sans-serif'><o:p></o:p></span></p></div></div></div></div></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif'>…</span><o:p></o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal><span style='font-family:"Arial",sans-serif'>>…</span><span style='font-size:13.5pt;font-family:"Arial",sans-serif'>Or maybe they were formed even before the first stars, before any element formed, before even a proton could form when everything was a mega-hot mega-dense quark gluon plasma. Computer simulations say if they exist primordial Black Holes should have more elliptical orbits than stellar Black Holes, so once we have more mergers for statistical analysis (a thousand a year should do the trick) we might be able to recognize that there are indeed 2 clear cut populations of orbiting Black Holes. </span><span style='font-family:"Arial",sans-serif'>…</span><span style='font-size:13.5pt;font-family:"Arial",sans-serif'>John K Clark </span><span style='font-family:"Arial",sans-serif'><o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><span style='font-size:16.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri",sans-serif'>I wasn’t aware until I went to his recent memorial service that Lee Corbin was working on black hole stuff for some time. About three years ago, we went to breakfast and I shared what I was thinking about at the time.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri",sans-serif'>Imagine a neutron star of less than Chandrasekhar’s limit, but big. I think two solar masses works for this thought experiment. Now imagine you are a photon and you originate very nearby, perhaps from a neutron decay or something. You head outbound, you get way red-shifted, but go on your way. Now imagine two such neutron stars orbiting each other at some distance. If you originate between the two and head outbound along an axis perpendicular to the line connecting the two (like the axle on your bike tire with the two neutron stars on the rim) then you still get away, but even more red shift.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri",sans-serif'>OK now imagine bringing the two neutron stars closer together until eventually an event horizon envelopes the both of them. Now if you are a photon which forms between them, you are out of luck, you are staying home.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri",sans-serif'>So far so good? OK now imagine those two big sub-Chandrasekhar neutron stars in an elliptic orbit about each other. When they get close during perihelion (peri-neutrion?) they are temporarily close enough to form an area between the two masses where you (the photon) cannot escape. Afterwards the neutron stars move apart toward aphelion, at which time that region between opens back up to proton escape.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri",sans-serif'>I am not sure it works that way, or if I am incorrectly mixing Newtonian and Einstein models, but this blipping in and out of existence the photon-stay-home region would cause the orbits of the neutron stars to decay quickly, causing that ringdown.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri",sans-serif'>Anyway, Lee Corbin and I discussed this, and I think he went off and worked on it but we didn’t discuss the matter further.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri",sans-serif'>spike <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal><o:p> </o:p></p></blockquote></div><p class=MsoNormal><o:p> </o:p></p></div></div></div></body></html>