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It seems a lot of Indian universities classify faculty who work on General Relativity under "Mathematics". Example. They are a professor of mathematics at Visvesvaraya National Institute of Technology, and their fields of expertise are given as General Relativity & Cosmology. These topics seem much more related to physics than mathematics; certainly non-Indian universities would usually list these faculty in their Physics Department.

Why do Indian universities apparently classify these topics under mathematics? There are also cases where the professor of mathematics has expertise in elementary particle physics and quantum field theory.

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    It's common to find faculty with a math PhD doing mathematical physics work in areas like GR and field theory in math departments elsewhere too. For individual researchers like Dr. Singh (who has a math PhD), you might want to look more closely to their style of work than the keywords. Commented 14 hours ago

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You make the assumption that the university made that decision. But that person might just be a mathematician who was hired into a math department and who, over time, has moved research towards questions related to relativity. There are of course many mathematical questions related to relativity, but even if they're now working on more physical questions, that might just have been the evolution of their career rather than someone making a conscious decision to place the research area in any specific department.

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    If we look at the members of the Indian Association for General Relativity and Gravitation (iagrg.in/members_current.html), CTRL + F of that page for "math" finds 127 results, compared to "physics" which has 183 results. That seems to me like GR is indeed commonly classified under mathematics in India, although it's unclear who made that decision. Commented 2 hours ago

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