Currents and the Energy-Momentum Tensor in Classical Field Theory: A fresh look at an Old Problem · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/hep-th_0307199/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMTCurrents and the Energy-Momentum Tensor in Classical Field Theory: A fresh look at an Old Problem — mentioned by raattgifthttps://news.ycombinator.com/item?id=16510900urn:hackerpapers:mention:hep-th_0307199:16510900Sat, 03 Mar 2018 19:02:29 GMT<p>Sabine Hossenfelder has a slightly tongue-in-cheek FAQ on anti-gravitation, and from time to time blogs about it. https://fias.uni-frankfurt.de/~hossi/Physics/anti-gravity.ht... You might find that interesting. The key constraints come from General Relativity; the successes of the Schwarzschild and Kerr(-Newman) metrics for physically plausible arrangements of matter need to be preserved if you try to add in a symmetry. If we use perturbation theory to capture deviations from the metric of a reasonable exact solution to the Einstein Field Equations, the structures can be represented as…</p><p><a href="https://hackerpaper.kaipfister.de/p/hep-th_0307199/">Paper and discussion history</a>. A mention is not an endorsement.</p>hep-th