The PDG http://pdg.lbl.gov/2019/html/authors_2018.html lists the Graviton as an observable particle (measurements). Is this an accepted fact? All other information says it is just hypothetical i.e. Wiki etc. see http://pdg.lbl.gov/2019/tables/rpp2019-sum-gauge-higgs-bosons.pdf
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3The first link appears to just be a list of people, and the second link just notes an upper bound on the mass that a graviton could have if it existed. Am I missing the part that says that it's been observed? – Nat Aug 14 '19 at 22:07
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Possible duplicates: https://physics.stackexchange.com/q/119254/2451 and links therein. – Qmechanic Aug 14 '19 at 22:13
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It has not been observed, and may never be. – G. Smith Aug 14 '19 at 22:13
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Have you asked the PDG site what their intention is ? We cannot be certain what their intention is and they may need to clarify their pages. – StephenG - Help Ukraine Aug 14 '19 at 22:17
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The PDF of the second link reports $m_\text{graviton} < 6 \cdot {10}^{-32} , \mathrm{eV}, $ which this PDF reports as coming from this 2002 paper. Looks like it's sort of an old, speculative upper bound on a hypothetical graviton mass, rather than any sort of confirmation. – Nat Aug 14 '19 at 22:57
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@Nat By "observable" I am using their reported measurement as the standard. – Harry Aug 15 '19 at 02:43
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@Harry It's not really a "measurement" in the sense that I suspect you're thinking about. – Nat Aug 15 '19 at 03:09