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Path: ...!feeder1.cambriumusenet.nl!feed.tweak.nl!217.73.144.44.MISMATCH!feeder.ecngs.de!ecngs!feeder2.ecngs.de!168.119.53.7.MISMATCH!weretis.net!feeder8.news.weretis.net!pasdenom.info!from-devjntp Message-ID: <uyw_Rf4humImAnQkqrxv9suxxf0@jntp> JNTP-Route: news2.nemoweb.net JNTP-DataType: Article Subject: Re: Proper time differences References: <time-20240708154438@ram.dialup.fu-berlin.de> Newsgroups: sci.physics.relativity JNTP-HashClient: BDKFblFS6XWxt0Y8o4pEdOZIhTM JNTP-ThreadID: time-20240708154438@ram.dialup.fu-berlin.de JNTP-Uri: http://news2.nemoweb.net/?DataID=uyw_Rf4humImAnQkqrxv9suxxf0@jntp User-Agent: Nemo/0.999a JNTP-OriginServer: news2.nemoweb.net Date: Mon, 08 Jul 24 15:33:58 +0000 Organization: Nemoweb JNTP-Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 Injection-Info: news2.nemoweb.net; posting-host="e8cbf2474b472b9bb79db3dccb6a856bc1d05409"; logging-data="2024-07-08T15:33:58Z/8938782"; posting-account="4@news2.nemoweb.net"; mail-complaints-to="julien.arlandis@gmail.com" JNTP-ProtocolVersion: 0.21.1 JNTP-Server: PhpNemoServer/0.94.5 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-JNTP-JsonNewsGateway: 0.96 From: Richard Hachel <r.hachel@wanadou.fr> Bytes: 2876 Lines: 42 Le 08/07/2024 à 16:45, ram@zedat.fu-berlin.de (Stefan Ram) a écrit : > From various sources I gather, > > dt = "gamma" d"tau". > > Where t is the coordinate time in the rest frame, "gamma" > is the Lorentz gamma factor and "tau" is the proper time. > > Now, if "gamma" is constant, I think we can replace the "d" > by "D" (triangle which is flat at its bottom), i.e., we can > use finite difference instead of infinitesimal ones: > > Dt = "gamma" D"tau". > > I believe 0<="gamma"<=1, so, for an example, we can assume > "gamma" to be 0.5: > > Dt = 0.5 D"tau", > > which means just, > > D"tau" = 2 Dt. > > So, that would mean: For a moving thing the proper time > difference D"tau" (I assume: between two fixed events) is > /larger/ than the coordinate time difference. > > But since falling muons live longer, the proper time distance > should be /smaller/, not larger! > > What's wrong here? TIA! Es gibt ein chinesisches Sprichwort, das besagt: „Es ist besser, fünf Minuten lang dumm zu erscheinen, als sein ganzes Leben lang dumm zu bleiben.“ Das bedeutet: Wenn Sie etwas nicht wissen, zögern Sie nicht, nachzufragen. In diesem Forum gibt es den besten Theoretiker der speziellen Relativitätstheorie aller Zeiten, ganz zu schweigen von seinen Erklärungs- und Popularisierungsmöglichkeiten, und wenn wir eine Frage in Ihrem Stil stellen, liegt es an ihm, die Sie stellen müssen. R.H.