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Cristian Joana’s Homepage



Welcome to Cristian Joana’s homepage.


I am a post-doctoral researcher interested in numerical relativity and cosmology. I am affiliated the Institute of Theoretical Physics, Chinese Academy of Science (ITP-CAS), located in Beijing.


In my work I use numerical tools like numerical relativity simulations to study and test different models and phenomena of the early Universe. During my PhD, I focused on the initial conditions problem for cosmic inflation (see paper and post), as well the process of preheating (see paper and post). Currently, my reaserch focuses on searching for observables from (multi-field) inflation, and inprints from the reheating in the form of primordial gravitaitonal waves, as well as the formation of exotic compact objects, including primordial black holes. I am a developer of GRChombo, a public, open-source numerical relativity code I frequently use in my works.

 

ITP group

November 2023, the cosmology group at ITP with our guest Prof. Teruaki Suyama (TITech).

 


In the past, I enjoyed working in other interdisciplinary areas:

  • From 2016-2018, I have worked for the INM-6 at the Juelich Research Center for neuroscience research in Germany. I helped with the modeling and analysis of electrophysiological data from macaque visual cortices in relation to the animal’s eye movements during free-viewing. Check out this paper for more information.

  • Earlier, in 2012, I enjoyed an internship grant to work in Tim Byrnes Lab for quantum computing, previously located at the NII in Tokyo (currenlty at NYU-Shanghai). Together we wrote a paper on producing steady-state negative Wigner function light within exciton-polariton systems. Such methodologies could be used in the context of continuous-variables in quantum computing.


Finally, you can find some of my rants in Twitter, my research and codes in GitHub, or challenge me to a chess game in Chess.com.

Main Research Topics:

  • Cosmology: Early universe, inflation; primordial black holes.
  • Gravitation: Scalar-tensor theories; compact objects & topological defects.
  • Numerical relativity: Hydro-GR codes, strong gravity regimes, applications to cosmology.
  • Interdiciplinary: Quantum Physics, Quantum Open Systems, Neurosciences…

Current Teaching

  • None.

Past Teaching

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Collaborations

Collaborators

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News and Updates

For more detailed updates, see BLOGS.

  • April 2025: New JCAP paper on PBHs and SIGWs, check a summary here

  • September 2024: New paper accepted in PRD. See post.

  • August 2024: My grant application for NSFC (RFIS I) has been accepted.

  • March 2024: The website has a new look!

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