home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!dziuxsolim.rutgers.edu!ruhets.rutgers.edu!bweiner
- From: bweiner@ruhets.rutgers.edu (Benjamin Weiner)
- Newsgroups: sci.physics
- Subject: Re: How old is the universe?
- Message-ID: <Sep.15.15.57.43.1992.13699@ruhets.rutgers.edu>
- Date: 15 Sep 92 19:57:43 GMT
- References: <92255.094948DOCTORJ@SLACVM.SLAC.STANFORD.EDU> <Sep.14.17.21.17.1992.29178@ruhets.rutgers.edu> <193dkgINNdrl@agate.berkeley.edu>
- Organization: Rutgers Univ., New Brunswick, N.J.
- Lines: 19
-
- ted@physics.Berkeley.EDU (Emory F. Bunn) writes:
- > ... However, if you look into things
- >a little bit more closely, all inflation says is that Omega should be
- >very very close to 1. (The argument actually says that during the
- >inflationary period, Omega(t) approaches 1 very rapidly from whatever
- >its initial value was.) So if inflation is right, it's perfectly
- >possible that Omega is 0.9999999....99999, or that it's
- >1.000000000000....00001. In the first case, the Universe will
- >expand forever, while in the second case it will eventually recollapse
- >(although not for an extremely long time).
-
- Yup, in my limited understanding, inflation "blows up" the universe so
- much that we can see only a tiny little portion of it, which
- naturally looks very flat - but the whole shmeer could actually be
- either open or closed, as you said. Still, the turnaround time is
- so vast that it's essentially meaningless (I have enough trouble
- trying to conceive of a megaparsec). I was trying to emphasize that
- the "open vs. closed" issue which used to dominate popular accounts
- of cosmology is, for the moment, a non-issue.
-