Robittybob1

Said on the 4th of March ... what was that about now? Is echolocation a learned skill in bats? Do the parents show their young bats how to do it?

There were only a few waves so there was only half that number of orbits so it would be real easy for me to set up a macro that would take the mass loss into account and follow the BHs right into the merger, but if I do that it will be next month.

I used those polarity formulas because they looked do-able and Strange said they would tell me what the 3D structure of the GW would be like. It has been a bit of a diversion, but an interesting one, for I played around with the formulas and got a feeling for what is happening during the inspiral and ringdown phases. We couldn't see the 3D structure as the equations were simplified and only worked where R is much larger than the wavelength.

No one liked Roy Kerr's spinning black holes to start with either. It is a learning curve for everyone.

If we took a 30 solar mass BH and worked out its Sr from that radius we could work out the surface area, and divide the kgs by the square meters so we'd get its kg/m^2 value. Has that mass per square meter got a density? Does it have a depth?

there are a lot of types of these crab spiders. They never seem to produce webs. Whether they can wrap their prey in silk I'm not sure. I saw one holding onto a fly the other day but I think it had picked up a dead fly. [They often crawl around bench tops. If you look at them they behave as if they know you are looking at them as they turn and will be looking at you, which seems to make them appear very intelligent. They seem to predict your movements they can only walk or jump but they always move in the right direction to get away.] They look very much like the fossil. In this video the crab spider appears to be suspended by a thread at 1:00 minute mark

Who was the scientist who first proposed this type of BH?

Was there anything drastically wrong with what I said: I notice the frequency stays around the same, whereas the amplitude during the ringdown is exponentially decreasing. there didn't seem to be the expression of time for combining of the two BHs settling into one spherical shape in Strange's post. Even though what he says is in some of the animations, where the two EH instantly combine to become a larger one.

Worth thinking about. CoM rather than actual mass.

That reminded me of what I call crab spiders. They too don't produce a web. http://ednieuw.home.xs4all.nl/australian/thomisidae/crabspiders.html

What computer language is that?

You can't instantly go from two spheres to one enlarged sphere. But the more they overlap the less mass is orbiting, and that could be the ringdown? You would get less GW with time and because the amount of "orbiting" (wobbling) mass is decreasing the frequency is largely stable. The enlarged BH continues to radiate GWs until the whole thing is a symmetrical spinning shape again. It does NOT go into the ringdown phase. How about answering the bolded question. There must be a change over from h+ to hx at various angles so is it possible e.g. at 45 degrees inclination to be the addition of both types of strain? Have I got that right?

Does the event horizon have no thickness? Is it a surface with no or only very small depth. Has it got a depth dimension? Is it a physical object and not just a distance? Wikipedia on Event horizon: .They make the event horizon sound more like a distance rather than a physical object.

If the mass is inside the BH or even at the EH how does gravity get out? Light can't but gravity can, there seems to be a difference. OK I might be behind the times but are you saying we should never use the word "singularity" ever when describing a BH? Seems to be used extensively in Wikipedia still . All those equations for the amplitude of the gravitational wave were based on the the CoM of the BH not the event horizon http://www.scienceforums.net/topic/94060-what-is-the-best-3d-description-of-gravitational-waves/page-3#entry913453. You guys have got me lost. You seem to know something I don't. How can we do calculations from the center of a BH if we can't know about it?

That is just a whole lot more questions and answers.

This article describes ringdown as I think ATM. https://www.quora.com/What-is-black-hole-merger-ringdown . So from that description ringdown starts when the event horizons first touch ( except in an highly elliptical orbit I could imagine it being intermittent to begin with). The part that contacts is no longer orbiting interesting! With the two equations for strain should we be adding the strains produced at a certain time together? They both can't be producing a strain of full intensity at the same time.

if the definition says it is a sphere I'm never going to use the word Schwarzschild radius ever again in relation to orbiting BHs, we'll just have to call it something else that allows it to change shape. "Event horizon" maybe Wikipedia event horizon:

If the mass was not situated at the singularity, that is fine by me but how do you get that mass to orbit at different speeds and stay together as a BH? You must be dealing with new physics if that can happen. If the center of a BH about to contact another BH is going at 0.5c how fast is the mass going on the non-contacting side? Can you have mass at that distance at that speed and maintain an orbit?

No not really because it now appears that the event horizon which was used synonymously with the Sr is now no longer always a sphere.

Gravity gets out through the event horizon agreed? Do gravitons have mass? Does gravitational waves have energy hence a type of mass equivalence? Are you using the word "warped" in the sense of the singularity no longer in the center of a sphere? That is based on what research? (See if you can quote a paragraph that says something to that effect.)

Wikipedia: Where does the mass of a BH reside? The definition says it is a sphere. Did Schwarzschild ever envision a BH moving at half the speed of light? If gravity moves at the SoL but the singularity is moving at half the speed of light.

each bubble might be compared to a mini version of the Miller Urey experiment.

It would be one observer on one of the binary BHs looking across to the other. I've got no idea how we would apply relativity to that. There was that guy David Waite who would sort out problems like that just for fun. He was on Physforum but Physforum is shut down for maintenance at the moment.

if I had the time I would like to go through the whole paper. but they gave us the value of the strain and we compared that with what they got at LIGO strain = 1.0E-21 I've given up on it at the moment. I'll still be looking for evidence of relativistic effects on a fast moving event horizon.

[latex]\hbar = \frac{h}{2 \pi} .[/latex] [latex]E = \hbar \omega [/latex] [latex]E_0 = \hbar^1/2,[/latex] Doesn't seem to make sense.