Self-introduction: Keiya Hirashima

Hi! My name is Keiya Hirashima, and I am a Special Postdoctoral Researcher at iTHEMS, working on galaxy formation and evolution using AI and large-scale simulations.
My research focuses on modeling the effects of individual stars and stellar feedback in high-resolution galaxy simulations. To reduce computational costs, I have developed AI-based surrogate models that efficiently replace expensive physical simulations.
I’m particularly interested in connecting different physical scales to study the hierarchical evolution of galaxies and the universe through numerical methods, deep learning, and high-performance computing.
I also explore how fractal structures and foundation models can help extract general representations from complex physical systems.

[My academic history]
I began my position as a Special Postdoctoral Researcher at iTHEMS in April 2025. Prior to that, I studied computer science and mathematical science at Kyoto University in March 2020, and received my Ph.D. in Astronomy (sub: Information Science) from the University of Tokyo in March 2025. I have also worked on research on deep foundation models for (astro)physics at PolymathicAI and Flatiron Institute (USA).