If I see a body at temperature $T$, will I see the same temperature in another frame under a Lorentz boost. And will the internal energy of a body also remain invariant under a Lorentz boost or not..
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1Does this answer your question? Is temperature a Lorentz invariant in relativity? – G. Smith Nov 24 '20 at 18:39
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@G.Smith, is this an open problem for entropy in different frames? – niels nielsen Nov 24 '20 at 19:25
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@G.Smith Ok I bit, I would say. Is Landsberg's result final or not. And I have a question for internal energy too which doesn't seem to be answered there. Is internal energy Lorentz invariant as Chet Miller is suggesting here or not https://physics.stackexchange.com/q/595137/113699. Can you let me know if internal energy is a Lorentz invariant or not. – Shashaank Nov 24 '20 at 19:27
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@nielsnielsen Ohh, I didn't know question was an open problem, I thought it would be trivial. But what about internal energy, is it Lorentz invariant or not.. – Shashaank Nov 24 '20 at 19:28
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This recent article may help you https://www.nature.com/articles/s41598-017-17526-4 – Mohammad Javanshiry Nov 24 '20 at 19:45
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@nielsnielsen I don’t know. This question about entropy and Lorentz transformations didn’t get any answers. – G. Smith Nov 24 '20 at 20:42