Semantic search over Edward Witten's arXiv papers. Ask a physics question and
this finds the most relevant passages, ranked by meaning. By default it is a
finder: source passages with arXiv links. Paste your own API key
under "Grounded answer" and it will also write an answer — required to cite the retrieved
passages, checked and retried by a citation validator: cite-or-fail. The full offline
version is the local app.
Everything runs in your browser — no server of ours; your key goes only to
the provider you choose.
The key lives in this tab only and is sent directly to the provider above — this page has no backend and stores nothing. One answer sends the top-8 passages (≈5k input tokens). The answer must cite passage IDs; fabricated or missing citations trigger one corrective retry, then fail loudly — same guardrail as the local app.
Built with transformers.js (BGE-small, 384-dim) + brute-force cosine over … passages, all client-side. arXiv-only corpus; pre-arXiv papers excluded. Source.