Article View: sci.physics.cond-matter
Article #44Re: Neutrino Masses
From: Matt Carey
Date: Wed, 18 Jul 2001 00:47
Date: Wed, 18 Jul 2001 00:47
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2681 bytes
"Gordon D. Pusch" wrote: > > The majority of the neutrinos left over from the Big Bang *were* in > thermal equilibrium at the time they decoupled, i.e., at the time the > Universe became essentially ``transparent'' to neutrinos ca. 1 sec > after the Big Bang (``ABB'' :-); however, since then cosmic expansion > has ``cooled'' them in the same sense that photons have ``cooled,'' > and like photons, most of them are not in thermal equilbrium with > _ANYTHING_ anymore, since the average neutrino (or BB photon!) now has > a negligible probability of EVER interacting with ANYTHING ever again... > (Unless, of course, the ``Accelerating Universe'' claims turn out > to be wrong, and the Universe re-collapses after all!). Hello, 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. Matt
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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 17:54:28 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!newsfeed.google.com!sn-xit-03!supernews.com!newsfeed.wirehub.nl!news.maxwell.syr.edu!news-was.dfn.de!znr.news.ans.net!news.chips.ibm.com!newsfeed.btv.ibm.com!news.btv.ibm.com!not-for-mail From: Matt Carey <matt.carey@ieee.org> Newsgroups: sci.physics.cond-matter,sci.materials,sci.mech.fluids,fj.sci.matter Subject: Re: Neutrino Masses Date: Tue, 17 Jul 2001 17:47:33 -0700 Organization: IBM Global Services North -- Burlington, Vermont, USA Lines: 26 Message-ID: <3B54DCA5.CCB64198@ieee.org> 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> Reply-To: matt.carey@ieee.org NNTP-Posting-Host: carey1.almaden.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Trace: news.btv.ibm.com 995417081 19192 9.1.18.139 (18 Jul 2001 00:44:41 GMT) X-Complaints-To: news@btv.ibm.com NNTP-Posting-Date: 18 Jul 2001 00:44:41 GMT X-Mailer: Mozilla 4.72 [en] (Windows NT 5.0; U) X-Accept-Language: en