Recent content by Stonius

Right, so It's not true to say that all the four forces were united into one force. More that the temperature was so great that even particles could not form for long enough to even exhibit the strong or weak force. Once things had cooled enough to form particles, baryons, etc, there was matter...

Thanks Drakkith! Why don't the normal Solutions of GR apply in the early universe? What I mean is that the assumptions of the Schwarzild solution are already partially incorrect as spacetime is not flat, but accelerating & expanding, right? - yet GR still holds. How much expansion is...

Thanks Mordred Is there a simple reason why all four forces were united into one primordial force before the plank era? From what I read it's supposed to be temperature related. So I guess if you get enough matter/energy in the one place the fundamental forces stop working? But *why? Also...

Hope this isn't too simplistic, but; Type 1a supernovae tell us gravity is constant for as far as we can observe Type 1a also provide evidence that the rate of cosmic expansion is accelerating Wouldn't the early universe have at some point been below the density required by the...

That's what I don't get. Two virtual particles form near a black hole. Being virtual particles, one of them will have negative mass (unlike normal particles or anti particles). The sum of the two, as you mention is zero. If the choice of which particle fall in is completely random, there is no...

Thanks, MFB Right. He's saying that hawking radiation is proportional to the size of the black hole. I am asking if the radiations of wavelengths longer than the size of the black hole is another way of visualising what is a highly abstract mathematical concept. But wait... if true...

Thanks, yes I see that now. Rest is arbitrary, but inertia is not. :-)

I thought the mechanism (when simplified) essentially came down to the capturing of virtual particles produced at the boundary? I know it's more complicated than that, but every explanation I have ever read on the subject seems to say that it's a highly mathematical concept. The closest real...

Is this not generally true? I thought that the gamut of interactions at different energies ran from extremely high energy gamma rays that can break apart atoms, and even form matter from energy if two extremely energetic photons intereact, through longer wavelengths that cause the photoelectric...

Yes, of course you're right. I was looking at a minkowski diagram where the planes of simultaneity seem an first glance to show same age at reunion. But yes, the traveling twin ages less in relation to the stationary one. Thanks.

I was under the impression that one of the ways of representing a black body (for explaining the ultraviolet catastrophe) is as a 'resonant box'. Frequencies lower than the dimensions of the box cannot be contained within and the black body is thus 'transparent' to those frequencies of light...

Thanks Peter, I appreciate it. All makes sense now. Re those animations; I don't suppose there's an easily digestible account of those Schwarzschild bubbles anywhere? Cheers Markus

Thanks for the replies. I suppose my presumptions of what is 'at rest' stem from the solution to the twin paradox and the equivalence principle. I thought that the equivalence principle meant that inertia from acceleration and G forces from gravity were equivalent, which is why it is the...

Basic question I'm sure, but here goes; If the following is correct; An object may be considered to be 'at rest' when there are no inertial forces acting upon it (ie; it is not accelerating). A satellite is at rest because it is in freefall. A person standing still on the Earth's...

Okay Charles, I think i get an inkling of what you're talking about. I've heard of holes being discussed in (IIRC) semiconductor physics. Its an interesting theory, but I may have it wrong, so I'll repeat what I understand to check I'm not garbling it. Essentially the universe is full of holes...