A Problematic Matter or What Is the Matter with Matter

With this, we should have enough material to sum up our derivation of the world formula and start on some applications. However, before we can do that, we have to discuss the matter term T^δγ , or, as it is also called, the energy momentum tensor from the Einstein-Hilbert action integrand R δ γ − 1 2 R . https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003146445/46b54e56-3535-4028-99ac-a6232858e728/content/math6_375_1_B.tif"/> γ^δγ + Λ · γ^δγ + κ · T^δγ. Hilbert [137] and Einstein [138] had to postulate this term and introduced it into the General Theory of Relativity. They were not able to give a fundamental origin other than the suggestion that “matter simply had to be there”.