Re: [Phys-L] Big Bang

[Jeffrey Schnick <JSchnick@Anselm.Edu>]

> -----Original Message-----
> From: Phys-l [mailto:phys-l-bounces@phys-l.org] On Behalf Of Jeffrey
> Schnick
> Sent: Thursday, March 14, 2013 10:53 AM
> To: Phys-L@Phys-L.org
> Subject: Re: [Phys-L] Big Bang
>
> This is a side issue, but I think that in arriving at the size of the universe at the
> time of the big bang, based on the essentially infinite density of the universe
> at that time, one assumes that the universe is currently a sphere of diameter

radius 14 billion light years (not diameter)

> 14 billion light years with us at the center.  I think that the size that they are
> actually talking about is the size of that portion of the universe which is visible
> to us and that they should refer to it as such.
>
> I think that in arriving at the size of the universe one assumes that there is a
> finite amount of mass in the universe in which case infinite density implies
> infinitesimal diameter.  I don't think we have evidence that the mass of the
> universe is finite.  I don't think we can rule out infinite density and infinite
> diameter at the time of the big bang.