[ExI] LIGO: RE: Hey, look on the bright side

spike spike66 at att.net
Fri Nov 11 04:28:49 UTC 2016


 

 

From: extropy-chat [mailto:extropy-chat-bounces at lists.extropy.org] On Behalf Of John Clark
Sent: Thursday, November 10, 2016 8:01 PM
To: ExI chat list <extropy-chat at lists.extropy.org>
Subject: Re: [ExI] LIGO: RE: Hey, look on the bright side

 

On Wed, Nov 9, 2016 at 3:13 PM, spike <spike66 at att.net <mailto:spike66 at att.net> > wrote:

 

​> >…if black hole mergers can make this signal, then neutron binaries can too,

 

​…

 

​>…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. …John K Clark 

 

 

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.

 

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.

 

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.

 

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.

 

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.

 

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.

 

spike 

 

 

 

 

 

 

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