W-SparQ-BL models time-varying lower-level responses with multi-output GPs and sparse approximations to achieve sublinear dynamic regret in bilevel optimization under noise.
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Static and kinetic Ising models fitted to S&P 500 binary returns reveal sectorally organized pairwise interactions (within-sector couplings ~2.8x between-sector) and time-varying field regimes around the dot-com bust, GFC, and COVID.
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A Statistical Physics View of the S&P 500: Pairwise Interactions and Time-Varying Dynamics
Static and kinetic Ising models fitted to S&P 500 binary returns reveal sectorally organized pairwise interactions (within-sector couplings ~2.8x between-sector) and time-varying field regimes around the dot-com bust, GFC, and COVID.