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Fruzsina Julia Agocs

Fruzsina Julia Agocs

PhD student

Primordial cosmology

Numerical methods - ODEs, integration

Machine learning

Room K14
Kavli Institute for Cosmology,
Madingley Road

Cambridge CB3 0HA
Office Phone: (01223) 760796



  • 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--

Other Professional Activities

Conferences, talks, and posters

Selected talks (9 total, * invited)

  • *Numerical analysis seminar, CCM, Flatiron Insitute, 2020
  • *Cosmology seminar, University of Oxford, 2020
  • Talk, Scipy (virtual) conference, 2020
  • *Seminar, Battcock Centre for Experimental Astrophysics, Cambridge, 2020
  • *Seminar, Insitute of Astronomy, Cambridge

Conferences and workshops

  • KICC10: conference for the 10th year anniversary of the Kavli Institute, Cambridge (poster), 2019
  • Astro Hack Week, Cambridge (invited participant, led breakout session on Gaussian processes), 2019
  • Cavendish Graduate Student Conference, Cambridge (poster), 2019
  • Bayesian Data Analysis workshop, Imperial College London, 2018
  • CDT summer school in machine learning, University College London (poster), 2018

Selected outreach 

  • Astronomy lecture and observation session at the Logikatábor summer camp, Visegrád, Hungary, 2020
    • 6 hours of teaching, ∼90 children aged 10-17
  • Interviewed for article on meteor showers and for in-depth personal article (in Hungarian), 2020
    • In online magazine which reaches ∼100 000 readers a day
  • Periscope broadcast at RWTH Aachen University, 2020
    • Viewed by ∼1900 people live
  • Invited speaker at the Women in STEM residential, Gonville and Caius college, 2018
    • Presentation and Q&A for ∼40 girls aged 16

Academic service

  • Reviewer: Journal of Open-Source Software (JOSS, 2020-)
  • Top reviewer, PC member: Scipy (virtual) conference (2020), Scipy Japan (virtual) conference (2020)



Inflation ; Numerical methods ; Cosmology


  • Relativity and Gravitation

Key Publications

Complete list of publications on NASA ADS
F. J. Agocs, M. P. Hobson, W. J. Handley, and A. N. Lasenby. "Dense output for highly oscillatory numerical solutions." Submitted to Phys. Rev. Research, Jul 2020.
F. J. Agocs, L. T. Hergt, W. J. Handley, A. N. Lasenby, and M. P. Hobson. "Quantum initial conditions for inflation and canonical invariance." Physical Review D, vol. 102, no. 2, 2020, doi:10.1103/physrevd.102.023507.
F. J. Agocs, 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.