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-- George L. Murphy firstname.lastname@example.org http://web.raex.com/~gmurphy/
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Return-Path: <email@example.com> Received: from hotmail.com (f88.hotmail.com [126.96.36.199]) by vectura.raex.com (8.8.8/8.8.7) with SMTP id EAA00973 for <firstname.lastname@example.org>; Wed, 30 Dec 1998 04:22:12 -0500 (EST) Received: (qmail 4704 invoked by uid 0); 30 Dec 1998 09:21:41 -0000 Message-ID: <email@example.com> Received: from 188.8.131.52 by www.hotmail.com with HTTP; Wed, 30 Dec 1998 01:21:40 PST X-Originating-IP: [184.108.40.206] From: "Adam Crowl" <firstname.lastname@example.org> To: email@example.com Subject: Re: Accelerating Expansion of the Universe Date: Wed, 30 Dec 1998 01:21:40 PST Mime-Version: 1.0 Content-Type: text/plain X-UIDL: 7c6f9a55fea42f51ea5bb83769eda8d4 Status: U X-Mozilla-Status: 0011
So will the Universe become a scattering of dust, or an Omega Point? That's the $6.4*10^4 dollar question...
>Date: Tue, 29 Dec 1998 07:58:01 -0500 >From: George Murphy <firstname.lastname@example.org> >To: RDehaan237@aol.com >CC: email@example.com, firstname.lastname@example.org, email@example.com >Subject: Re: Accelerating Expansion of the Universe > >RDehaan237@aol.com wrote: > .................. >> "A positive cosmological constant it seems, though this finding is in >> conflict with other lines of evidence. Frank Tipler pointed me to >> studies which suggest that until we measure distances accurately out to >> ~ z = 3, then local motions will probably distort the apparent value of >> Hubble's "constant". That'll take some doing yet." > > A little hermeneutic of suspicion: The announced result, _if_ it holds up, >would wreck Tipler's "physics of immortality". > Hence why I ask him for his opinion. Still there are other lines of evidence that cast doubt on a non-zero lambda. Specifically, studies that have gotten different results for Omega, placing it close to 1. Ned Wright mentions one at his Cosmology Web-site, and I've read others over time. Non-cosmological motions of galaxies could be the culprit masking the real value of Omega. The "kink" in the super-novae plots seems rather sharp to me, a bit peculiar...
> >> "What does it mean for the Universe, is more to the point? Never ending >> expansion and separation of all non-bound systems... a very lonely >> Universe in the distant future. All non-bound masses will disappear over >> each other's c-boundary. Maybe. That's if the lambda factor is >> well-behaved. In the far future it may reverse and bring it all back to >> a Big Crunch. There's no theoretical way of knowing what the long term >> behaviour of lambda will be. It's a vacuum energy phenomenon and that's >> something physics still has a poor grasp on." > > Lambda may be entirely a vacuum energy phenomenon - if you come at the issue >from a particle physicist/quantum field theorist position. If you approach it from >the geometrically-minded general relativist's position, lambda may be a fundamental >feature of the laws of physics - e.g., to _define_ a metric in terms of curvature in the >sort of affine theory which Schroedinger explored. > Any Web-references for that? I'd have to dig it up from my friendly [but far away] University library otherwise. IMO the Universe is a rather perverse mix of Platonic forms and rascally matter, so geometric arguments may be more sirens of the mind than sure guides to truth.
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