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Comment on "Heavy Quarkonium in Extreme Conditions"

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arxiv 2001.10205 v1 pith:A4EBJVAZ submitted 2020-01-28 hep-ph hep-latnucl-th

Comment on "Heavy Quarkonium in Extreme Conditions"

classification hep-ph hep-latnucl-th
keywords methodbryancounterexamplebasiscommentdecompositionmakesrothkopf
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In a recent paper (arXiv:1912.02253), Rothkopf claims that the Bryan method, which is widely used to obtain the solution in the maximum entropy method and makes use of the singular value decomposition of a matrix, limits the search space for the solution. He even presents a counterexample to the Bryan method. In this comment, we first recapitulate the mathematical basis of the Bryan method, and reconfirm that it makes use of no approximations and that it is therefore mathematically rigorous. In the second part, we explicitly show that Rothkopf's ``counterexample'' actually does not constitute a counterexample on the basis of the definition of singular value decomposition itself.

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  1. The noiseless limit and improved-prior limit of the maximum entropy method and their implications for the analytic continuation problem

    physics.comp-ph 2025-11 conditional novelty 6.0

    Maximum-entropy analytic continuation becomes linear, Bryan's algorithm becomes valid, and MSE scaling improves in the limit where the estimator sits close to the Bayesian prior.