Hai! I'm

M. Fahmi Fauzi,

and I study gravitating stuff~



(About me)

My full name is Muhammad Fahmi Fauzi, and I am a PhD student at the Université Catholique de Louvain (UCLouvain), Belgium. I am working on the graviational wave lensing in general relativity and beyond. I previously worked on the observational and phenomenological aspects of gravitating objects, especially black holes and exotic stars.

See my full CV here

Pict: me and my mom during my master's graduation ceremony at the University of Indonesia.

(2026—now)

PhD, Université Catholique de Louvain, Belgium

Centre for Cosmology, Particle Physics and Phenomenology (CP3).

Trying to get out of my comfort zone, and contribute to solve the apparent problem in observational aspects of gravity: the gravitational wave lensing. I thought I'll be familiar with it in a couple of days, but no...

Supervised by Prof. Justin Janquart.

(2023—2025)

MSc, Universitas Indonesia, Indonesia

Theoretical Nuclear-Particle Physics and Astrophysics (Nukparstro).

Here, for the first time, I formally studied the theory of general relativity. I gained curiosity on general relativistic ray tracing, primarily inspired by Interstellar's Gargantua and video games.

Supervised by Prof. Anto Sulaksono and Dr. Handhika S. Ramadhan.

(2019—2023)

BSc, Universitas Padjadjaran, Indonesia

Physics.

I started to gain interest on general relativity in the late semester, although there were no course specializing in relativity. Quite unfortunate...

Supervised by Dr. Nowo Riveli and Dr. Budi Adiperdana.

I like to bring complex physics concepts to people in an accurate but simple way, with the help of animation--just like Veritasium, roughly speaking… and you can see my Veritasium-wanna-be attempts at @askedby.emi on Instagram or TikTok. I also contributed to several past contents (2020-2024) of Pajajaran Physical Society, both on Instagram and YouTube. Check them out! They are still producing some good stuff (in Indonesian language only though, unfortunately).

Other than physics, I enjoy playing video games (especially story-based, open-world AAA games--Red Dead Redemption 2, to be specific), strumming musical instruments (mainly piano and guitar, though I'm not an expert), building PCs, photographing moments, making coffee, doing pull-ups, and more…

Some of the members of the Theoretical Astrophysics and Nuclear-Particle Physics Group, University of Indonesia.
Sitting in the middle is my master's and research advisor, Dr. Handhika S. Ramadhan.

(Research stuff)

My past works attempted to connect various theoretical models of black holes and (ultra-)compact objects in general relativity and other theories of gravity with observations. Most of them were focused on optical observables, but the gravitational-wave channel starts to gain my attention.

In my PhD, I am working on gravitational wave lensing under the supervision of Prof. Justin Janquart. Kind of like a merger between my interest in (optical) gravitational lensing and gravitational waves, but no, it's not that straightforward...

Pict: a destroyed spinning nonsingular black hole surrounded by a thin accretion disk [Fauzi et al. CQG 42, 225012 (2025)]

Research interests
  1. Stuffs about gravitational waves (lensing, quasinormal modes, echoes, etc.),
  2. Optical observables of various black hole models (shadows, lensing, appearance, etc.),
  3. Observational aspects of black hole destruction (it's a side quest, for now),
  4. Stuff related to (ultra-)compact objects
Favorite works
  1. M. F. Fauzi, H. S. Ramadhan, A. Sulaksono and H. Hasanuddin, "Imaging the destruction of a rotating regular black hole,'' Class. Quant. Grav. 42, 225012 (2025)
  2. M. F. Fauzi, H. S. Ramadhan and A. Sulaksono, "Two descriptions of dark matter around a black hole: Photon sphere, shadow, and lensing,'' Phys. Lett. B 875, 140367 (2026)
  3. M. F. Fauzi, B. N. Jayawiguna, H. S. Ramadhan and A. Sulaksono, "Horizonless star based on regular black hole with finite radius and its observational signatures," Eur. Phys. J. C 85, 903 (2025)
  4. M. F. Fauzi, "Comment on 'Strong lensing and shadow of Ayon-Beato-Garcia (ABG) nonsingular black hole'," Eur. Phys. J. C 85, 1246 (2025)

You can visit my InspireHEP profile for a complete list of my work!

Conferences, talks, seminars, and workshops
  1. The 34th Workshop on General Relativity and Gravitation in Japan (JGRG34), Kyoto University-- Kyoto, Japan, 19-23 January 2026. Presented a poster titled "Imaging the destruction of a spinning nonsingular black hole."
  2. 14th International Physics Seminar (IPS), Universitas Negeri Jakarta-- Jakarta, Indonesia, 21 June 2025. Presented a talk titled "Witnessing the destruction of rotating regular black hole."
  3. 1st International Physics Conference (IPC), Universitas Pendidikan Indonesia-- Bandung, Indonesia, 9 November 2024. Presented a talk titled "Shadow images of regular black hole with a finite boundary."

I built my own MATLAB-based ray-tracing code for my master's thesis to generate appearance images of an accretion disk surrounding a central object in static and spherically symmetric spacetimes. I also built another ray-tracing code in Julia for my other published research, which I am still actively developing. I intend to put them on GitHub once the final, clean version of the code is finished. Feel free to reach out if you are curious!

In the meantime, take a look at one of my favorite results!

Evolution of a spinning black hole's appearance during its destruction by a collapsing null shell. Details are available in Fauzi et al., CQG 42, 225012 (2025). [Right] An accretion disk surrounds the black hole as a light source. [Left] A background grid located far from the black hole is used (not available in the paper!).