---
license: mit
---

# Physics Steering: Causal Control of Cross-Domain Concepts in a Physics Foundation Model

[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
[![GitHub Repo](https://img.shields.io/badge/GitHub-Repo-blue?logo=github)](https://github.com/DJ-Fear/walrus_steering)
[![arXiv](https://img.shields.io/badge/arXiv-2511.20798-b31b1b.svg)](https://arxiv.org/abs/2511.20798)

This checkpoint contains weights for the [Walrus](https://huggingface.co/polymathic-ai/walrus) physics foundation model, fine-tuned and used for activation steering experiments described in *Physics Steering: Causal Control of Cross-Domain Concepts in a Physics Foundation Model* — [arXiv:2511.20798v2](https://arxiv.org/abs/2511.20798).

The base Walrus model is a 1.3B-parameter space–time Transformer trained on 19 physical simulation datasets. See the main [Walrus repo](https://github.com/PolymathicAI/walrus) for full details on the architecture and pretraining.


## Usage

Download the checkpoint and point your config at it:

```bash
huggingface-cli download DJ-Fear/walrus_steering coalesced.pth --local-dir ./checkpoint/
```

Then set `load_checkpoint_path` to the folder containing the downloaded `coalesced.pth`.