leaving black holes
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From: Omega on 3 Oct 2009 21:37 eric gisse wrote: > Omega wrote: > [...] > >>> >>> Ok, people whose knowledge of physics consists of terminology >>> grokked from doctor who have no right to contribute. >> >> As the "direction" of the big bang is in to our past, the direction >> of the singularity of our local black hole is to our >> future. ( That is, is not so much where, as when. And to account for >> the Hubble Constant and the negative deceleration paramenter as >> being due to its tidal force, its minimum mass is ~3.18619 x 10^53 >> kg). >> >> Better? > > No. You are confident that the universe ends in a singularity when > actual physicists are not, and you use 5 significant figures to > describe the mass of the universe when you don't even know if you are > within a factor of 10,000 of the real answer. I used 6 significant figures, not 5. But you are correct. I'd thought that the least number of significant digits of the parameters that I used had six. But one has only 2. The figure (say ~3.1 x 10^53 kg) that I derive is a MINIMUM. The model that I espouse is an idealized version and I used a classical approximation. If your estimate of my error based on the estimated mass of the universe (which is not one of the parameters that I used), then that it is only 4 orders of magnitude out of 53 is excellent. Thank you.
From: Jonah Thomas on 3 Oct 2009 21:12 eric gisse <jowr.pi.nospam(a)gmail.com> wrote: > Jonah Thomas wrote: > > eric gisse <jowr.pi.nospam(a)gmail.com> wrote: > >> Omega wrote: > > > >> > - The direction to the singularity of the black hole in which we > >> > live is the past. > >> > - The direction to the singularity of a black hole is the future. > >> > > >> > ? > >> > >> We don't live in a black hole. Do catch up. > > > > "The righteous man is like a frog that lives at the bottom of a > > well. To him the sky looks like a small round hole." > > > > Seriously, is there a reason our universe couldn't be a black hole > > ah, extruded from some other universe? > > You mean OTHER than the reason I JUST GAVE which neither of you > understand? I didn't even notice you doing it. Would you mind explaining it again maybe in more detail or simpler or more explicitly?
From: eric gisse on 3 Oct 2009 21:33 Jonah Thomas wrote: > eric gisse <jowr.pi.nospam(a)gmail.com> wrote: >> Jonah Thomas wrote: >> > eric gisse <jowr.pi.nospam(a)gmail.com> wrote: >> >> Omega wrote: >> > >> >> > - The direction to the singularity of the black hole in which we >> >> > live is the past. >> >> > - The direction to the singularity of a black hole is the future. >> >> > >> >> > ? >> >> >> >> We don't live in a black hole. Do catch up. >> > >> > "The righteous man is like a frog that lives at the bottom of a >> > well. To him the sky looks like a small round hole." >> > >> > Seriously, is there a reason our universe couldn't be a black hole >> > ah, extruded from some other universe? >> >> You mean OTHER than the reason I JUST GAVE which neither of you >> understand? > > I didn't even notice you doing it. Would you mind explaining it again > maybe in more detail or simpler or more explicitly? A black hole has the unique feature of swapping the role of time and space inside the event horizon. A freely moving observer marches - unstoppably - towards the singularity, just as a freely moving observer marches towards the future in Minkowski spacetime. The observable universe is not like this. We are not in a black hole.
From: YKhan on 5 Oct 2009 02:20 On Oct 3, 5:10 pm, eric gisse <jowr.pi.nos...(a)gmail.com> wrote: > Yousuf Khan wrote: > > eric gisse wrote: > >> bz wrote: > >>> If I remember correctly, "someone" has calculated that the amount of > >>> matter is "close" to the amount that would be needed for a black hole > >>> the size of the known universe. > > >>> Perhaps we live inside a black hole. > > >> Which direction is the singularity? > > > Towards the past. :) > > An unexpectedly correct answer. > > Now which direction is the singularity in a black hole? > > The future. A black hole inside another black hole reverses its direction of time. Yousuf Khan
From: YKhan on 5 Oct 2009 02:22
On Oct 3, 6:08 pm, eric gisse <jowr.pi.nos...(a)gmail.com> wrote: > We don't live in a black hole. Do catch up. And how can you prove that? Yousuf Khan |