Felix Laga
Physics, research and software. Based in Tokyo.
I studied physics at KU Leuven, with a minor in biochemistry, and now do a master’s in physics at the Institute of Science Tokyo. My research is on gravitational waves: with Teruaki Suyama I wrote a paper on when they can be treated classically, and when single gravitons start to matter.
Since 2023 I have built websites and custom software for clients, and I now work on Pacium, an AI-native accounting platform. Outside of that: triathlon, drawing, and running an investment group.
Work
- Pacium (2026–now). An AI-native accounting platform for Belgian accounting firms. Agents take on the routine work of a junior accountant, while the accountant stays in charge.
- Websites and software for clients (2023–now). Started as an interest and grew into a paying business. I build websites and custom software for professionals.
- Plenti (2024–25). A platform for people across Belgium to share their skills with each other. I started it with two close friends and built the web and mobile apps.
Websites
- switch.back, concept website. A concept site for Tokyo galleries and their artists. A 3D waterfall of artworks runs behind the text and inverts where it meets the type. In Japanese and English. Source
- Joris Van Lint, architecture portfolio. Built to match the original 15-page A3 sketch exactly, with a small admin for editing text and photos and publishing changes. Source
- Maren Rens, photography portfolio. Street photography, artworks and columns from Leuven, with an admin dashboard for uploading and laying out new work. Source
- BenchBazaar, benchmark registry. An open registry for community-made LLM benchmarks. Authors publish the method and public examples, keep the scored set sealed, and attach versioned receipts to every result. Source
- Keiko Study, test prep platform. Study guides and practice for the GRE, GMAT and UK admissions tests, with a study planner and an AI tutor that runs on the learner's own ChatGPT account. Source
Projects
- T3Learn (2026). A Mac app that teaches one reasoning step at a time. A teacher agent finds where your understanding ends, plans a path to your goal and checks each step with questions. What you learn becomes a knowledge graph that later sessions read. Download for Mac
- FungMod (2026). A Python solver that simulates how fungi and their enzymes break down materials such as PET, cellulose and lignin, with uncertainty on every result. Docs PyPI
- OrbitDrop (2026). A native Mac menu-bar app: drag a file, pause, and drop it on a glass wheel to convert it, crop it or add a background. For Apple Silicon on macOS 13 or later. Not notarized by Apple: on first launch, use Open Anyway in Privacy & Security. Download for Mac (Apple Silicon)
- SPECTRA-Bench (2026). A benchmark that profiles language models on eight behaviours from autism research, such as detail versus gist, literal versus pragmatic reading and persistence after a topic switch.
- Indra (2026). A workspace for scientific literature. It searches Semantic Scholar and arXiv, splits answers into single claims, checks each one against its source and maps citations, gaps and contradictions.
- MuseMarker AI (2025). A Chrome extension for highlighting and annotating text on any website, with a chat that discusses, explains or summarises the selection using Gemini. Highlights and notes stay in the browser. Chrome Web Store
Publications
- Quantum description of gravitational waves generated by a classical source. Felix Laga, Teruaki Suyama. arXiv:2604.20228 [gr-qc]. Gravitational waves from a classical source, treated as a quantum field. The expected field matches the classical retarded solution, and the number of emitted gravitons follows Poisson statistics, as for a coherent state. The paper gives a criterion for when the classical picture holds: it is very accurate for astrophysical sources, while laboratory-scale sources may reach a regime where individual gravitons matter.