Job Leon Feldbrugge

Publications

Also available on arXiv, NASA ADS and as a pdf.

Articles

2026

  1. S. Crew, J. Feldbrugge, Asymptotic evaluation of multidimensional oscillatory integrals. arXiv:2610.22767 [math-ph]
  2. I. Aniceto, J. Feldbrugge, C. J. Howls, Which saddles contribute? The South-East rule for multidimensional integrals. arXiv:2606.28271 [math-ph]
  3. A. Read, J. Feldbrugge, C. Boehm, R. van de Weygaert, B. Hertzsch, Caustic skeleton and the local cosmic web: the Coma Cluster node and the Pisces–Perseus ridge. arXiv:2604.22213 [astro-ph.CO]
  4. B. Hertzsch, J. Feldbrugge, R. van de Weygaert, Galaxy populations in the IllustrisTNG caustic skeleton. Monthly Notices of the Royal Astronomical Society (2026). arXiv:2604.18209 [astro-ph.CO]
  5. J. Feldbrugge, S. Crew, U.-L. Pen, Resurgence and hyperasymptotics in wave optics astronomy. Journal of Cosmology and Astroparticle Physics (2026). arXiv:2602.21493 [astro-ph.CO]
  6. A. Weber, J. Feldbrugge, E. Pisanty, A universal approach to saddle-point methods in attosecond science. Physical Review A (2026). arXiv:2510.12545 [quant-ph]

2025

  1. B. Hertzsch, J. Feldbrugge, M. Rodriguez, R. van de Weygaert, A new recipe for caustic pancakes: on the reality of walls in the cosmic web. Journal of Cosmology and Astroparticle Physics (2025). arXiv:2510.02419 [astro-ph.CO]
  2. J. Feldbrugge, U.-L. Pen, The real-time Feynman path integral for step potentials. Annals of Physics (2025). arXiv:2508.17578 [quant-ph]
  3. J. Feldbrugge, J. Y. L. Jones, Efficient evaluation of real-time path integrals. Physical Review D (2025). arXiv:2501.16323 [quant-ph]
  4. B. Bonga, J. Feldbrugge, A. Metidieri, Wave optics for rotating stars. Physical Review D (2025). arXiv:2410.03828 [astro-ph.CO]
  5. J. Feldbrugge, R. van de Weygaert, What makes a cosmic filament? The dynamical origin and identity of filaments I. Fundamentals in 2D. Monthly Notices of the Royal Astronomical Society (2025). arXiv:2405.20475 [astro-ph.CO]
  6. J. Feldbrugge, Phase-space Delaunay tessellation field estimator. Monthly Notices of the Royal Astronomical Society (2025). arXiv:2402.16234 [astro-ph.CO]
  7. J. Feldbrugge, D. L. Jow, U.-L. Pen, Complex classical paths in quantum reflections and tunneling. Physical Review D (2025). arXiv:2309.12420 [quant-ph]

2023

  1. J. Feldbrugge, D. L. Jow, U.-L. Pen, Crossing singularities in the saddle point approximation. arXiv:2309.12427 [quant-ph]
  2. J. Feldbrugge, N. M. D. Niezink, Orthogonality relations for conical functions of imaginary order. arXiv:2309.05616 [math]
  3. J. Feldbrugge, Complex evaluation of angular power spectra: going beyond the Limber approximation. Physical Review D (2023). arXiv:2304.13064 [astro-ph.CO]
  4. J. Feldbrugge, Y. Yan, R. van de Weygaert, Statistics of tidal and deformation eigenvalue fields in the primordial Gaussian matter distribution: the two-dimensional case. Monthly Notices of the Royal Astronomical Society (2023). arXiv:2301.07200 [astro-ph.CO]
  5. J. Feldbrugge, R. van de Weygaert, Cosmic web & caustic skeleton: non-linear constrained realizations – 2D case studies. Journal of Cosmology and Astroparticle Physics (2023). arXiv:2212.07840 [astro-ph.CO]
  6. J. Feldbrugge, U.-L. Pen, N. Turok, Oscillatory path integrals for radio astronomy. Annals of Physics (2023). arXiv:1909.04632 [astro-ph.HE]
  7. J. Feldbrugge, Multi-plane lensing in wave optics. Monthly Notices of the Royal Astronomical Society (2023). arXiv:2010.03089 [astro-ph.CO]
  8. J. Feldbrugge, N. Turok, Existence of real time quantum path integrals. Annals of Physics (2023). arXiv:2207.12798 [hep-th]

2022

  1. D. L. Jow, U.-L. Pen, J. Feldbrugge, Regimes in astrophysical lensing: refractive optics, diffractive optics, and the Fresnel scale. Monthly Notices of the Royal Astronomical Society (2022). arXiv:2204.12004 [astro-ph.CO]

2021

  1. G. Wilding, K. Nevenzeel, R. van de Weygaert, G. Vegter, P. Pranav, B. J. T. Jones, K. Efstathiou, J. Feldbrugge, Persistent homology of the cosmic web. I: Hierarchical topology in ΛCDM cosmologies. Monthly Notices of the Royal Astronomical Society (2021). arXiv:2011.12851 [astro-ph.CO]

2020

  1. J. Feldbrugge, N. Turok, Gravitational lensing of binary systems in wave optics. arXiv:2008.01154 [gr-qc]

2019

  1. J. Feldbrugge, M. van Engelen, R. van de Weygaert, P. Pranav, G. Vegter, Stochastic homology of Gaussian vs. non-Gaussian random fields: graphs towards Betti numbers and persistence diagrams. Journal of Cosmology and Astroparticle Physics (2019). arXiv:1908.01619 [astro-ph.CO]
  2. A. Di Tucci, J. Feldbrugge, J.-L. Lehners, N. Turok, Quantum incompleteness of inflation. Physical Review D (2019). arXiv:1906.09007 [hep-th]
  3. P. Pranav, R. van de Weygaert, G. Vegter, B. J. T. Jones, R. J. Adler, J. Feldbrugge, C. Park, T. Buchert, M. Kerber, Topology and geometry of Gaussian random fields I: on Betti numbers, Euler characteristic, and Minkowski functionals. Monthly Notices of the Royal Astronomical Society (2019). arXiv:1812.07310 [astro-ph.CO]

2018

  1. J. Feldbrugge, J.-L. Lehners, N. Turok, Inconsistencies of the new no-boundary proposal. Universe (2018). arXiv:1805.01609 [hep-th]
  2. J. Feldbrugge, R. van de Weygaert, J. Hidding, J. Feldbrugge, Caustic skeleton & cosmic web. Journal of Cosmology and Astroparticle Physics (2018). arXiv:1703.09598 [astro-ph.CO]
  3. J. Feldbrugge, J.-L. Lehners, N. Turok, No rescue for the no boundary proposal: pointers to the future of quantum cosmology. Physical Review D (2018). arXiv:1708.05104 [hep-th]

2017

  1. J. Feldbrugge, J.-L. Lehners, N. Turok, No smooth beginning for spacetime. Physical Review Letters (2017). arXiv:1705.00192 [hep-th]
  2. J. Feldbrugge, J.-L. Lehners, N. Turok, Lorentzian quantum cosmology. Physical Review D (2017). arXiv:1703.02076 [hep-th]

2016

  1. J. Feldbrugge, J. Hidding, R. van de Weygaert, Statistics of caustics in large-scale structure formation. Proceedings of the International Astronomical Union, IAU Symposium 308 (2016). arXiv:1412.5121 [astro-ph.CO]

2013

  1. R. van de Weygaert, G. Vegter, H. Edelsbrunner, B. J. T. Jones, P. Pranav, C. Park, W. Hellwing, B. Eldering, N. Kruithof, E. G. P. Bos, J. Hidding, J. Feldbrugge, E. ten Have, M. van Engelen, M. Caroli, M. Teillaud, Alpha, Betti and the megaparsec universe: on the topology of the cosmic web. Transactions on Computational Science XIV, Lecture Notes in Computer Science 6970 (2013). arXiv:1306.3640 [astro-ph.CO]

Theses

  1. PhD thesis, Path integrals in the sky: classical and quantum problems with minimal assumptions. Perimeter Institute and University of Waterloo, supervised by Neil Turok (2019). [pdf]
  2. Part III essay, Primordial non-Gaussianity and large-scale structure. University of Cambridge, supervised by Paul Shellard and Tommaso Giannantonio (2015). [pdf]
  3. Master thesis, Statistics of caustics in large-scale structure formation. University of Groningen, supervised by Rien van de Weygaert, Diederik Roest and Aernout van Enter (2014). [pdf]
  4. Bachelor thesis (with M. van Engelen), Analysis of Betti numbers and persistence diagrams of two-dimensional Gaussian random fields. University of Groningen, supervised by Rien van de Weygaert, Gert Vegter and Elisabetta Pallante (2012). [pdf]