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Ue-Li Pen

Portrait de Ue-Li Pen
Canadian Institute for Theoretical Astrophysics

Area of Research:

Research Interests

My research interests cover a broad range of theoretical astrophysics from 21cm cosmology to coherent radiation from fast radio bursts and pulsars. Tools include N-body and fluid simulations (including the recent world's largest 3 trillion particle simulation on the PI wall) and radio telescopes such as CHIME and the Algonquin Radio Telescope.

Positions Held

  • CITA interim director, 2016-2019


  • Simons Investigator, US$500,000, Simons Foundation, 2nd person to receive in Canada, described on the PI news https://perimeterinstitute.ca/news/simons-investigator-award-support-ue-li-pens-research

Recent Publications

  • Yu, H-R., Pen, U., Wang, X. (2018). CUBE: An Information-optimized Parallel Cosmological N-body Algorithm. The Astrophysical Journal Supplement Series, 237 (2), article id. 24
  • The CHIME/FRB Collaboration; Amiri, M.; Bandura, K.; Berger, P.; Bhardwaj, M.; Boyce, M. M.; Boyle, P. J.; Brar, C.; Burhanpurkar, M.; Chawla, P.; Chowdhury, J.; Cliche, J.-F.; Cranmer, M. D.; Cubranic, D.; Deng, M.; Denman, N.; Dobbs, M.; Fandino, M.; Fonseca, E.; Gaensler, B. M.; Giri, U.; Gilbert, A. J.; Good, D. C.; Guliani, S.; Halpern, M.; Hinshaw, G.; Höfer, C.; Josephy, A.; Kaspi, V. M.; Landecker, T. L.; Lang, D.; Liao, H.; Masui, K. W.; Mena-Parra, J.; Naidu, A.; Newburgh, L. B.; Ng, C.; Patel, C.; Pen, U.-L.; Pinsonneault-Marotte, T.; Pleunis, Z.; Rafiei Ravandi, M.; Ransom, S. M.; Renard, A.; Scholz, P.; Sigurdson, K.; Siegel, S. R.; Smith, K. M.; Stairs, I. H.; Tendulkar, S. P.; Vanderlinde, K.; Wiebe, D. V. (2018). The CHIME Fast Radio Burst Project: System Overview. The Astrophysical Journal, 863 (1), article id. 48
  • Simard, D., Pen, U. (2018). Predicting pulsar scintillation from refractive plasma sheets. Monthly Notices of the Royal Astronomical Society, 478 (1), p.983-994
  • Main, Yang, Chan, Li, Lin, Mahajan, Pen, Vanderlinde, van Kerkwijk. (2018). Pulsar emission amplified and resolved by plasma lensing in an eclipsing binary. Nature, 557 (7706), p.522-525
  • Anderson, C. J.; Luciw, N. J.; Li, Y.-C.; Kuo, C. Y.; Yadav, J.; Masui, K. W.; Chang, T.-C.; Chen, X., et al. (2018). Low-amplitude clustering in low-redshift 21-cm intensity maps cross-correlated with 2dF galaxy densities. Monthly Notices of the Royal Astronomical Society (476): p.3382-3392
  • Oppermann, N., Yu, H-R. (2018). On the non-Poissonian repetition pattern of FRB121102. Monthly Notices of the Royal Astronomical Society (475): p.5109-5115
  • Lin, H-H., Masui, K., Peterson, J. (2018). Improved pulsar timing via principal component mode tracking. Monthly Notices of the Royal Astronomical Society(475): p.1323-1330
  • Desvignes, G.; Eatough, R. P.; Pen, U. L.; Lee, K. J.; Mao, S. A.; Karuppusamy, R., et al. (2018). Large Magneto-ionic Variations toward the Galactic Center Magnetar, PSR J1745-2900. The Astrophysical Journal Letters (852): id. L12, p.5
  • Berger, P., Oppermann, N., Pen, U., Shaw, J. R. (2017). An efficient method for removing point sources from full-sky radio interferometric maps. Monthly Notices of the Royal Astronomical Society (472): p.4928-4934
  • Zhu, H-M., Yu, Y., Chen, X., Yu, H-R. (2017). Nonlinear reconstruction. Physical Review D (96): id.123502
  • Baker, D., Kodwani, D., Yang, I.-S. (2017). A self-consistency check for unitary propagation of Hawking quanta. International Journal of Modern Physics A (32): id. 1750198
  • Yu, Y., Pen, U., Zhu, H.M. (2017). Hawking quanta Halo Nonlinear Reconstruction. The Astrophysical Journal (847): p1-9
  • Pan, Qiaoyin; Pen, Ue-Li; Inman, Derek; Yu, Hao-Ran. (2017). Increasing Fisher information by Potential Isobaric Reconstruction. Monthly Notices of the Royal Astronomical Society. 469(2): p.1968-1973
  • Amiri, M.; Bandura, K.; Berger, P.; Bond, J. R.; Cliche, J. F.; Connor, L.; Deng, M.; Denman, N.; Dobbs, M.; Domagalski, R. S.; Fandino, M.; Gilbert, A. J.; Good, D. C.; Halpern, M.; Hanna, D.; Hincks, A. D.; Hinshaw, G.; Höfer, C.; Hsyu, G.; Klages, P.; Landecker, T. L.; Masui, K.; Mena-Parra, J.; Newburgh, L. B.; Oppermann, N.; Pen, U. L.; Peterson, J. B.; Pinsonneault-Marotte, T.; Renard, A.; Shaw, J. R.; Siegel, S. R.; Sigurdson, K.; Smith, K.; Storer, E.; Tretyakov, I.; Vanderlinde, K.; Wiebe, D. V.; Scientific Collaboration20, CHIME. (2017). Limits on the Ultra-bright Fast Radio Burst Population from the CHIME Pathfinder. The Astrophysical Journal. 844(2): id. 161 1-11
  • Emberson, J. D.; Yu, Hao-Ran; Inman, Derek; Zhang, Tong-Jie; Pen, Ue-Li; Harnois-Déraps, Joachim; Yuan, Shuo; Teng, Huan-Yu; Zhu, Hong-Ming; Chen, Xuelei; Xing, Zhi-Zhong. (2017) Cosmological neutrino simulations at extreme scale. Research in Astronomy and Astrophysics (17): id. 085
  • Post-correlation beamformer for time-domain studies of pulsars and transients, Roy, Jayanta; Chengalur, Jayaram N.; Pen, Ue-Li, eprint arXiv: 1808.01088


  • 'Intensity Maping Collaboration", Seminar, October 10, 2017
  • ‘Democratic Cosmology", PI seminar, March 2, 2017
  • ‘Democratic Cosmology", Johns Hopkins University, Jan 23, 2017
  • ‘Nonlinear Cosmology", Stanford Colloquium, Jan 12, 2017
  • ‘Small Scale Magnetic Lenses", McGill Colloquium, Jan 9, 2017
  • ‘Fast Radio Bursts", THU seminar, Nov 10, 2016
  • ‘Fast Radio Bursts", Guizhou University Seminar, Nov 3, 2016
  • ‘Cosmological Simulations", Beijing Normal, University seminar, Oct 21, 2016
  • 'Neutrino Cosmology", ASIAA colloquium, Taipei, Oct 19, 2016
  • "Neutrino Cosmology" Cifar, Whistler, 10m, April 2, 2016, oral, not refereed, new
  • "Neutrino bias", Perimeter Institute, March 3, 2016