03/2026 Dio Danarianto

Nationality: Indonesian

Can you briefly introduce yourself and tell us where you’re from?

Hi, my name is Dio. I am from Indonesia. It has been almost 6 months since I started my doctoral research in the University of Potsdam.

In which master program and where did you study before coming to Potsdam? How did you get interested in your field of study?

I completed my bachelor's and master’s degrees in physics at Universitas Indonesia. For both degrees, my final thesis focused on theoretical physics, specifically examining gravity within compact stars. Outside of my formal studies, I engage in observational astronomy both as a hobby; with amateur astronomer community which I joined in since high school, and professionally; for example, I worked a few years as a researcher during the construction of the national observatory in Indonesia.

In my current research, my goal is to bridge these two worlds: the theoretical aspects of fundamental physics, such as theories of gravity, and how the data from observational astronomy rule out them. It is interesting to see how astronomical observations provide clues about the fundamental nature of gravity. It is essentially detective work, but on a astronomical scale.

How did you choose your PhD program? Tell us about your research!

My current research focuses on testing Einstein’s theory of gravity and newer alternative ideas. We do this by comparing what these theories predict with actual data from the astronomy observations. We use information from a variety of sources, like light from stars and ripples in space called gravitational waves. Combining these different signals is known as "multimessenger astronomy", which is like studying the universe using both our eyes and our ears at the same time.

It is interesting to test how gravity works under extreme conditions that we cannot recreate here on Earth. To do this, we use neutron stars as our laboratory in space. These are the densest objects known in the universe. By looking at observations of these stars and comparing them to what different gravity theories expect to happen, we can see which theories hold up and where they break down.

This specific research interest led me to the group at the University of Potsdam. They have strong, well-known expertise in studying neutron stars using these combined signals. I contacted the professor and presented my proposal to the group online. At the same time, I applied for the DAAD scholarship and successfully secured the funding for my PhD studies.

Was there anything about studying in Germany that surprised you?

One thing that really surprised me since I started studying in Germany is how often we have direct dialogues. Unlike what I was used to, here everyone more actively asks questions, criticize, and give feedback on our work. It is surprising at start, but I realized that it pushes the limits of my knowledge. It's been crucial for me to verify my understanding and make sure my logic is solid.

What’s your favorite thing about studying at University of Potsdam?

For me, the best part of being in Potsdam is the scientific environment. It’s quite humbling to be so close to the AEI and AIP, where there are many experts in gravitational physics and observational astronomy research. I feel very lucky because I can easily join their talks or have some discussion with their staff, which really helps me gain new perspectives related to my own work.

What role does the German language play in your studies, daily life and your plans for the future?

One thing I’ve realized is that while my research is entirely in English, German is still essential for daily life here. Whether it’s just for grocery shopping or dealing with the local bureaucracy. I’m still at a very basic level, so it’s a learning process, but I’m trying to bridge that gap.

What do you like most about living in Potsdam?

Potsdam is perfect for students who prefer a quieter lifestyle. It’s calm enough for deep work, yet it’s close to Berlin where you can find many things. It really in the sweet spot of both worlds.

How are you experiencing your first (and cold) winter here? Any special moments?

Coming from the tropics, the cold, dry air was a shock. I even had nosebleeds several times. Adjusting my biological clock to the different daylight hours was also a struggle. But it’s all became manageable with the right clothing and habits.

Seeing the snow for the first time was a truly 'healing' and beautiful experience. I didn’t expect it to fall so often here, but having several weeks of snow has allowed me to slowly explore the city while everything is covered in white. It’s a very peaceful sight that has helped me appreciate my time here much more.

What advice would you give to future international students/researchers coming to Potsdam?

My advice is to contact the Welcome Center as soon as you know you are coming to Potsdam. They have a great network across different institutions; in my case, I received very helpful information forwarded from the GFZ Welcome Center regarding housing. I also recommend joining the 'Buddy Program.' It’s a great way to find a new friend or someone to talk to who can guide you through your first arrival in the city.

What are your plans for the future?

After finishing my studies, I plan to return to my home institution in Indonesia to continue my work as a researcher. However, I am also open to pursuing a postdoctoral if the opportunity available (provided that I have permission from my institution, of course).