Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Phil Bouchard Newsgroups: sci.physics.relativity Subject: Re: Energy conservation in general relativity Date: Sun, 25 Oct 2015 21:33:47 -0400 Lines: 35 Message-ID: References: <0k8q2bt9ro2qlo9ltsh6kdaev9qmok4qis@4ax.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: individual.net qxh8y2P0dfSUa/tOdk5GvAWL3dtFdsV17IXlpjPi2BJwjAFQtR Cancel-Lock: sha1:zpAjpyQv2AM2gKZLGBhC4eArUIc= User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 In-Reply-To: Xref: csiph.com sci.physics.relativity:368122 On 10/25/2015 09:10 PM, shuba wrote: > Phil Bouchard wrote: > >> - General Relativity does not respect the laws of the >> conservation of the energy > > Energy is conserved *when conditions for energy conservation* are > met. In particular, this means understanding about the continuous > symmetries related to conserved quantities in physics as addressed > by Noether's theorem. Many good descriptions can be found online. > > As the one equation in the informative blog post below states, it > is the *covariant derivative* of the energy-momentum tensor which > equals zero in general relativity. > > http://www.preposterousuniverse.com/blog/2010/02/22/energy-is-not-conserved/ > > The covariant derivative differs from the regular derivative; the > former has some "extra terms". That equation involving covariant > derivatives *is* the generalization of the energy and momentum > conservation defined in special relativity and Newtonian physics. > > And, as the blog post also says, this has been known for a century. > > > ---Tim Shuba--- > "When the space through which particles move is changing, the total energy of those particles is not conserved." So the energy is not conserved because of GR. GR invented this nonsense. What? You're going to say that photons transform into dark energy? That's even more ridiculous.