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91探花
Black Hole

Lensing of space time around a black hole. At 91探花 we study black holes observationally and theoretically on all size and time scales - it is some of our core work.

Credit: ALAIN RIAZUELO, IAP/UPMC/CNRS. CLICK HERE TO VIEW MORE IMAGES.

Nicholas Choustikov

Grad student

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • Beecroft Institute for Particle Astrophysics and Cosmology
  • Cosmology
  • Galaxy formation and evolution
nicholas.choustikov@physics.ox.ac.uk
Denys Wilkinson Building, room UC
  • About

My research focuses on the study of the impacts of the first massive stars and black holes on the physical properties of the interstellar medium of galaxies in the high-redshift (z>6) Universe. I tackle this problem with high-resolution cosmological simulations of galaxy formation with on-the-fly radiative transfer magnetohydrodynamics coupled to non-equilibrium thermochemistry with the novel RAMSES II code, for which I am a core developer. I am particularly interested in using of these simulations to interpret sprectroscopic data from the James Webb Space Telescope. I am also a core member of the team.

I also actively research the process of cosmic Reionization, during which early galaxies were able to completely reionize the intergalactic medium. I have used synthetic observations of the SPHINX simulation to understand and diagnostics for the Lyman continuum escape fraction. Finally, I pioneered an approach using simulation based inference to directly infer the ionizing contributions of galaxies during the Epoch of Reionization. Using this method alongside public JWST data, I performed a new, of the history of Reionization.

I'm a British-New-Zealander DPhil student working with Professors Julien Devriendt and Adrianne Slyz. I am also the Graduate Teaching and Research Scholar in Physics at Oriel College. Before coming to 91探花, I received my masters in natural sciences from Cambridge, where my  focused on optimizing the computation of dynamical perturbations in large-scale dark matter perturbation theory. This work was completed with Dr. Zvonimir Vlah and Professor Anthony Challinor.

You can check out my work as well as a gallery of my favourite plots on my website:

Research interests

Astrophysics
Numerical Simulations
Black Holes
Synthetic Observations
Reionization

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