Article View: sci.physics.cond-matter
Article #46Re: Neutrino Masses
From: Gordon D. Pusch
Date: Wed, 18 Jul 2001 01:08
Date: Wed, 18 Jul 2001 01:08
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2705 bytes
Matt Carey <matt.carey@ieee.org> writes: > here's a question, since these initial neutrinos took off at the > speed of light (or slightly under if they have any mass), would > we ever see them? Since there is no reason for them to ever turn > around, aren't they at the edge of the expanding universe? The > neutrinos we see would then, likely, be relative newcommers. > > I could be wrong here, but that is what my intuition says. You are making the false assumption that the Big Bang happened at a single point in euclidean space, and expanded outward from it. However, according to GR, the Big Bang ``happened'' at _EVERY_ point of space, all at once, at the beginning of time, and it is _SPACE ITSELF_ that is expanding --- there is no ``center,'' no ``privileged'' point that the Universe expands ``outward'' from. And since the Universe has no ``privileged'' center, _EVERY_ region of the Universe is equally permeated by the fluxes of primordial photons and neutrinos (modulo statistical fluctuations). For further discussion, see Ned Wright's Cosmology FAQ and Tutorial: <http://www.astro.ucla.edu/~wright/cosmology_faq.html> <http://www.astro.ucla.edu/~wright/cosmo_01.htm> -- Gordon D. Pusch perl -e '$_ = "gdpusch\@NO.xnet.SPAM.com\n"; s/NO\.//; s/SPAM\.//; print;'
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1141dc,f4dfcde22ee4c9c6 X-Google-Attributes: gid1141dc,public X-Google-Thread: 104752,f4dfcde22ee4c9c6 X-Google-Attributes: gid104752,public X-Google-Thread: 100065,f4dfcde22ee4c9c6 X-Google-Attributes: gid100065,public X-Google-Thread: 106ae0,f4dfcde22ee4c9c6 X-Google-Attributes: gid106ae0,public X-Google-ArrivalTime: 2001-07-17 18:09:33 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!news.xnet.com!not-for-mail From: gdpusch@NO.xnet.SPAM.com (Gordon D. Pusch) Newsgroups: sci.physics.cond-matter,sci.materials,sci.mech.fluids,fj.sci.matter Subject: Re: Neutrino Masses Date: 17 Jul 2001 20:08:45 -0500 Organization: XNet Information Systems (Winstar) Lines: 27 Sender: pusch@pusch.xnet.com Message-ID: <m23d7vniw2.fsf@pusch.xnet.com> References: <a786eec.0107151054.5e5c867b@posting.google.com> <3B51F2D9.CEB79A8B@hate.spam.net> <3B5390E4.6056173A@ieee.org> <3B54A1A6.BE529082@grc.nasa.gov> <m266crnrcy.fsf@pusch.xnet.com> <3B54DCA5.CCB64198@ieee.org> NNTP-Posting-Host: pusch.xnet.com X-Trace: flood.xnet.com 995418572 22116 204.248.57.211 (18 Jul 2001 01:09:32 GMT) X-Complaints-To: abuse@xnet.com NNTP-Posting-Date: Wed, 18 Jul 2001 01:09:32 +0000 (UTC) Cc: matt.carey@ieee.org X-Newsreader: Gnus v5.7/Emacs 20.5