Article View: sci.physics.cond-matter
Article #45Re: Neutrino Masses
From: Matt Carey
Date: Wed, 18 Jul 2001 00:41
Date: Wed, 18 Jul 2001 00:41
29 lines
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2456 bytes
"Joseph.D.Warner" wrote: > > Matt Carey wrote: > > > <snip> > > 2) What is the "Room Temperature" of the universe? The bright > > boys at Bell Labs measured the background radiation of the universe > > at about 3K (2.77K?) as I recall. About 0.01 what we consider > > room temperature. kbT is about 1/40 eV at RT, so the background > > "temperature" of the universe would be about 1/4000 eV. Hardly > > enough to make a neutrino relativistic. > > No one, as I understand, has said that neutrinos are in thermal equalibrium > with rest of the universe I just found the concept of a "room temperature" neutrino humorous. "Every neutrino would be relativistic (kinetic energy exceeds rest mass) near room temp" This would imply that neutrinos are somehow in equilibrium with someone's room. Not only is it a silly notion, they would be barely relativistic at room temperature. (kinetic~0.5*rest mass) 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: 106ae0,f4dfcde22ee4c9c6 X-Google-Attributes: gid106ae0,public X-Google-Thread: 100065,f4dfcde22ee4c9c6 X-Google-Attributes: gid100065,public X-Google-ArrivalTime: 2001-07-17 17:57:31 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-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 17:41:57 -0700 Organization: IBM Global Services North -- Burlington, Vermont, USA Lines: 29 Message-ID: <3B54DB55.4F633BDA@ieee.org> References: <a786eec.0107151054.5e5c867b@posting.google.com> <3B51F2D9.CEB79A8B@hate.spam.net> <3B5390E4.6056173A@ieee.org> <3B54A1A6.BE529082@grc.nasa.gov> 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 995416745 18964 9.1.18.139 (18 Jul 2001 00:39:05 GMT) X-Complaints-To: news@btv.ibm.com NNTP-Posting-Date: 18 Jul 2001 00:39:05 GMT X-Mailer: Mozilla 4.72 [en] (Windows NT 5.0; U) X-Accept-Language: en