Author

J. Poveda

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Preprint Sep 2026

Fixed-Time ISS for Interconnected Discrete-Time Systems, Part I: Extinction-Based Lyapunov Functions

We study fixed-time input-to-state stability (FxT-ISS) for discrete-time systems subject to exogenous inputs. We introduce Lyapunov-based sufficient conditions for FxT- ISS based on a class of dissipation functions with a fixed-time extinction property, which encompasses commonly used two- power constructions while all...

Sumadhu Rubaiyat, J. Poveda · 1 citation

#machine learning Preprint Oct 2026

The Deceptive Bandit Problem: Exploratory Coupling and the Fragility of Multi-Agent Learning

Randomized exploration is central to bandit learning, multi-agent reinforcement learning, and zeroth-order policy search, yet its independence and privacy are usually only treated as technical assumptions. We show that these properties are critical for security purposes and demonstrate how an adversarial agent can expl...

Michael Tang, Mahmoud Abdelgalil, J. Poveda · 0 citations

Preprint Sep 2026

Stochastic Lie-Bracket Approximations for Zeroth-Order Optimization on Manifolds

We propose a continuous-time algorithm for zeroth-order global optimization of smooth functions on compact manifolds that synthesizes Riemannian gradient dynamics using only objective measurements, without evaluating gradients. The algorithm is formulated as an ordinary differential equation driven by piecewise-smooth...

Mahmoud Abdelgalil, Miroslav Krstić, J. Poveda · 1 citation