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Fruzsina Julia Agocs

Fruzsina Julia Agocs

PhD student

Primordial cosmology

Numerical methods - ODEs, integration

Machine learning

Kavli Institute for Cosmology,
Madingley Road

Cambridge CB3 0HA
Office Phone: +44 (0)1223 337550



  • 2017-present: PhD in Cosmology, University of Cambridge
  • 2016-2017: Master of Natural Sciences, University of Cambridge
    • Theoretical and experimental physics
    • Masters project: "The Runge-Kutta-Wentzel-Kramers-Brillouin method and the primordial Universe", supervised by Dr. Will Handley
  • 2013-2016: Bachelor of Arts in Natural Sciences, University of Cambridge

Work experience

  • July 2019-January 2020: Placement at the British Antarctic Survey
    • Predicting Arctic sea ice extent with temporal convolutional networks, supervised by Dr. Scott Hosking
  • Summer 2017 and 2016: Research engineer at Kokoon Technology Ltd., London
    • Classifying sleep stages from electroencephalography
  • Summer 2015: Research student at the Institute of Astronomy, University of Cambridge
    • Subtracting host-galaxy contributions to the spectral energy distributions of active galactic nuclei, supervised by Dr. Ranjan Vasudevan

Research Interests

My research focuses on topics in inflationary cosmology. 

Within that, I work on developing efficient numerical methods to solve commonly occurring differential equations, for the sake of quick Bayesian inference. I wrote oscode/pyoscode, a fast numerical solver for one-dimensional ordinary differential equations with highly oscillatory solutions, such as the Mukhanov-Sasaki equation or the one-dimensional Schrödinger equation.

I'm also interested in how initial conditions are set to cosmological perturbations, in particular the problem of setting the quantum vacuum in curved, expanding spacetimes.



  • Part III Relativistic Astrophysics and Cosmology, 2017--
  • Part II General Relativity 2017--2019
  • Part IA Mathematics 2018--


Key Publications

Agocs, F. J., L. T. Hergt, W. J. Handley, A. N. Lasenby, and M. P. Hobson. "Quantum initial conditions for inflation and canonical invariance." arXiv preprint arXiv:2002.07042 (2020).

Agocs, F. J., W. J. Handley, A. N. Lasenby, and M. P. Hobson. "Efficient method for solving highly oscillatory ordinary differential equations with applications to physical systems." Physical Review Research 2, no. 1 (2020): 013030.

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