Talk:Radiation astronomy/Gravitationals

Gravitational-wave astronomy

The last year, also gravitational-wave astronomy! Boris Tsirelson (discuss • contribs) 09:15, 3 January 2018 (UTC)

By the way, see also w:Astronomy#Observational_astronomy and w:Astronomy#Fields_not_based_on_the_electromagnetic_spectrum. Boris Tsirelson (discuss • contribs) 09:44, 3 January 2018 (UTC)

Thanks! I'll take a look at each, updates are good! --Marshallsumter (discuss • contribs) 11:51, 3 January 2018 (UTC)

"Gravitational radiation appears to be cylindrical waves of electromagnetic radiation produced by relativistic, undulatory gravitational fields in Euclidean space" — ?? No, the waves detected by LIGO are not at all electromagnetic. And not at all in Euclidean space. They are waves of non-Euclidean-ness of the (curved) space-time. Electromagnetism becomes relevant only within the LIGO equipment. (And by the way, a Euclidean space could not contain such black holes.) Boris Tsirelson (discuss • contribs) 08:15, 4 January 2018 (UTC)

I've removed "electromagnetic" from the introductory sentence. Here's what led to the Euclidean space portion: "It turns out that rigorous solutions exist and that the problem reduces to the usual cylindrical waves in euclidean space." from the abstract of the Einstein-Rosen paper. I could add a portion something like "Gravitational radiation which in theory originates outside Euclidean space; i.e., (curved) space-time, appears as cylindrical waves of radiation". Regarding "a Euclidean space could not contain such black holes" per the theory I agree, but neutron stars can exist based on the strong force independent of gravitation, also in theory. An astronomical object within Euclidean space may suggest an object currently resembling a theoretical black hole but may be something else. What do you think? --Marshallsumter (discuss • contribs) 15:36, 4 January 2018 (UTC)

I did not see that "ancient" article, thus I do not know how general are gravitational waves treated there, and whether or not the detected waves are of that form. Boris Tsirelson (discuss • contribs) 16:26, 4 January 2018 (UTC)

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