Benoît Collins

activity

20062025

most citedTheoretical Limits on Extrasolar Terrestrial Planet Detection with Coronagraphs

336 citations · 336 across the 4 of their papers we have counts for

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q-fin.ST2025

Holdout cross-validation for large non-Gaussian covariance matrix estimation using Weingarten calculus

Lamia Lamrani, Benoît Collins, Jean-Philippe Bouchaud

Cross-validation is one of the most widely used methods for model selection and evaluation; its efficiency for large covariance matrix estimation appears robust in practice, but li…

math.FA2025

Operator-valued Khintchine inequality for $ε$ -free semicircles

Benoît Collins, Akihiro Miyagawa

We exhibit several bounds for operator norms of the sum of $ε$ -free semicircular random variables introduced in the paper of Speicher and Wysoczański. In particular, using the firs…

Holdout cross-validation for large non-Gaussian covariance matrix estimation using Weingarten calculus

Operator-valued Khintchine inequality for ε-free semicircles

Operator-valued Khintchine inequality for $ε$ -free semicircles