Editing Albert Einstein (section)

==== Energy momentum pseudotensor ====
{{Main|Stress–energy–momentum pseudotensor}}
General relativity includes a dynamical spacetime, so it is difficult to see how to identify the conserved energy and momentum. [[Noether's theorem]] allows these quantities to be determined from a [[Lagrangian (field theory)|Lagrangian]] with [[translation invariance]], but [[general covariance]] makes translation invariance into something of a [[gauge symmetry]]. The energy and momentum derived within general relativity by [[Emmy Noether|Noether]]'s prescriptions do not make a real tensor for this reason.<ref>{{cite arXiv|first=Nina |last=Byers |author-link=Nina Byers |title=E. Noether's Discovery of the Deep Connection Between Symmetries and Conservation Laws |eprint=physics/9807044 |date=23 September 1998}}</ref>

Einstein argued that this is true for a fundamental reason: the gravitational field could be made to vanish by a choice of coordinates. He maintained that the non-covariant energy momentum pseudotensor was, in fact, the best description of the energy momentum distribution in a gravitational field. While the use of non-covariant objects like pseudotensors was criticized by [[Erwin Schrödinger]] and others, Einstein's approach has been echoed by physicists including [[Lev Landau]] and [[Evgeny Lifshitz]].<ref>{{cite journal|doi=10.1103/PhysRev.111.315 |first=J. N. |last=Goldberg |title=Conservation laws in general relativity |year=1958 |journal=Physical Review |volume=111 |number=1 |pages=315–320|bibcode=1958PhRv..111..315G }}</ref>