On Sunday, January 19, 2020 at 12:18:54 AM UTC-7, Brent wrote: > > > > On 1/18/2020 10:56 PM, Alan Grayson wrote: > > I don't claim anything except that GR has solutions for a cosmos in which >> space is flat and, in that solution, space is infinite and empirically it >> appears that space is flat. >> > > *Measurements don't establish it's flat, as I previously argued. And, as > you previously stated, the sign of k, the parameter in GR intimately > associated with curvature, is folded into the initial conditions. But since > the initial conditions are really unknown, or are speculative, you can > assume initial conditions which satisfy your bias, in this case FLAT. AG * > > > No. It's not an assumption. Empirically the universe appears flat, which > (assuming the FLRW model) implies it was always flat. It is not a > question of assuming an initial condition, it is inferring the initial > condition from present measurements of k. > > Brent >
*If, say, you have a sphere with the diameter of a light year, how far would its measured curvature deviate from zero? I'm suggesting that the deviations from zero might be the same as for a flat universe. But I am still stuck with an spatially infinite start, which most models incorporate IIUC. AG * -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/e058b68d-f10a-47de-b305-77264c5d3653%40googlegroups.com.
