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Siru Tao

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Preprint Aug 2026

Renaming or Tightness: Enforcing Disjunctive Information Flow Policies

A disjunctive policy allows a value to depend on at most one of two secrets and never on both: an analyst may consult one client's file or the other's, a share of a split secret may be released but not its sibling. Such policies are not lattice-shaped, and Hunt and Sands introduced the quantale of information to give t...

Xin Xu, Si-Ru Tao, Kai-Zhen Tan · 0 citations
Preprint Sep 2026

Teaching Vision-Language Models to Use the Scale They Are Given: Label-Free Equivariance Training for Metric Physical Reasoning

Metric questions about video require vision-language models to use supplied real-world references to convert visual measurements into physical units. Yet we find that current models use this scale information only partially. When every world-space quantity in a prompt is rescaled by a common factor, the video remains e...

Kai-Zhen Tan, Yang Feng, Heqing Du et al. · 0 citations
#robotics Jul 2026

What Can Latent World Models Know? Physical Parameter Identifiability in Multimodal Predictive Representations

A central premise of latent world models is that predicting the future forces a representation to internalize the physics of its environment. Which physical quantities does a trained latent actually contain, and what decides this? We answer with controlled interventions in POKEWORLD, an interactive environment whose vi...

Kai-Zhen Tan, Xin Xu, Siru Tao et al. · 2 citations
Jul 2026

Collusion with Competitive Marginals: Price-Level Audits Are Blind by Construction

Empirical work on algorithmic collusion asks one question of the data: are prices supracompetitive? We show this can be answered"no"by a conspiracy that is nonetheless profitable. Consider bidding agents that couple only through the joint distribution of their unexplained bid components, leaving every agent's own bid l...

Xin Xu, Cheng-Rui Wu, Jiayu Lu et al. · 1 citation

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