I hired **Kiyomi** from **Hawai’i** for our **NSF REU** summer program in spring 2020 amidst fears of the **pandemic **that eventually postponed the program two years. When she finally arrived in summer 2022, I had already retired from Wooster, where my last year was completely remote, classes via **Teams**, but several of those included **Daniel**. Despite the pandemic, I was fortunate to collaborate with both Daniel and Kiyomi — as well as colleagues in **Chemical Physics**, **Physics**, **Astrophysics**, and **Computer Science** — on an article just published in **Frontiers in Physics. **Based on Daniel’s **senior thesis** and Kiyomi’s **summer research**, the article is the very-**Wooster**, very-**interdisciplinary** Chemistry Does General Relativity: Reaction-Diffusion Waves Can Model Gravitational Lensing.

**Gravitational lensing** is a **general relativistic** (GR) phenomenon where a massive object redirects light, deflecting, magnifying, and sometimes multiplying its source. In the research, we used the chemistry of **Belousov-Zhabotinsky** (BΖ) **reaction-diffusion** (RD) waves to model this **astronomical effect** in a **table-top experiment**. We began by experimentally passing BΖ RD waves through non-planar quasi-two-dimensional molds. We next reproduced the waveforms in **computer simulations** of planar RD waves with **variable diffusion**. We then varied the diffusion parameter so the *effective* wave speed of planar waves matched the GR predictions for light deflection near a massive object. We thereby recovered Einstein’s famous **light deflection** formula, as summarized by the figure below.

Thanks, Mark! I enjoy reading your posts as well.