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Rajat Ghosh

2 papers indexed

arxivcs.LGmath-ph2026-07-03

Reduced-Order Models: The Mother of World Models

Rajat Ghosh

World models -- compressed latent representations of an environment that support action-conditioned prediction and planning -- are typically presented as a product of modern self-supervised learning. This paper argues that the functional anatomy of a world model was independently…

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arxivcs.LGstat.ML2026-06-29

Predictable GRPO: A Closed-Form Model of Training Dynamics

Rajat Ghosh, Datta Nimmaturi, Aryan Singhal, Vaishnavi Bhargava, Henry Wong, Johnu George, et al.

We develop a first-principles reduced-order model of these dynamics. Under a single mean-field assumption that summarizes the policy by its expected reward, we reduce the GRPO update to a stochastically-forced damped oscillator whose mass, damping, and stiffness are fixed in clos…

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