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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 pulsar scintillation. 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, 2016-2018


  • FAST fellow. FAST is the 500m radio telescope in China, largest in the world, substantially larger than the current SKA plans.

Recent Publications

  • 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
  • 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
  • Yu, Hao-Ran; Emberson, J. D.; Inman, Derek; Zhang, Tong-Jie; Pen, Ue-Li; Harnois-Déraps, Joachim; Yuan, Shuo; Teng, Huan-Yu; Zhu, Hong-Ming; Chen, Xuelei; Xing, Zhi-Zhong; Du, Yunfei; Zhang, Lilun; Lu, Yutong; Liao, Xiangke. (2017). Differential neutrino condensation onto cosmic structure. Nature Astronomy. 1: id.0143
  • Lin, Hsiu-Hsien; Masui, Kiyoshi; Pen, Ue-Li; Peterson, Jeffrey B. (2017). A pulsar timing solution from hydrogen mapping data. MNRAS (In Press)
  • Masui, Kiyoshi Wesley; Pen, Ue-Li; Turok, Neil. (2017). Two- and Three-Dimensional Probes of Parity in Primordial Gravity Waves. Physical Review Letters. 118 (22): id.221301
  • Anderson, Christopher; Luciw, Nicholas; Li, Yi-Chao; Kuo, Cheng-Yu; Yadav, Jaswant; Masui, Kiyoshi; Chang, Tzu-Ching; Chen, Xuelei; Oppermann, Niels; Pen, Ue-Li; Timbie, Peter T. (2017). Lack of small-scale clustering in 21-cm intensity maps crossed with 2dF galaxy densities at z ~ 0.08. American Astronomical Society: id.#314.08
  • Wang, Xin; Yu, Hao-Ran; Zhu, Hong-Ming; Yu, Yu; Pan, Qiaoyin; Pen, Ue-Li. (2017). Isobaric Reconstruction of the Baryonic Acoustic Oscillation. The Astrophysical Journal Letters, 841 (2): id. L29 1- 5
  • Main, Robert; van Kerkwijk, Marten; Pen, Ue-Li; Mahajan, Nikhil; Vanderlinde, Keith. (2017). Descattering of Giant Pulses in PSR B1957+20. The Astrophysical Journal Letters, 840 (2) : L15 1-6
  • Yu, Hao-Ran; Pen, Ue-Li; Zhang, Tong-Jie; Li, Di; Chen, Xuelei. (2017). Blind search for 21-cm absorption systems using a new generation of Chinese radio telescopes. Research in Astronomy and Astrophysics, 17 (6): id. 049
  • Pen, U., Yang, H, Nishizawa, A. (2017), Testing Gravity with Pulsar Scintillation Measurements, Physical Review D, 95 : 084049
  • Inman, D., Yu, H.R., Zhu, H.M., Pen, U., et al. (2017). Measurement of the Cold Dark Matter-Neutrino Dipole in the TianNu Simulation, Physical Review D, 95: 1-6
  • Inman, D, Pen, U. (2017). Cosmic neutrinos: dispersive and non-linear. Physical Review D. 95: 063535_1- 063535_9
  • Wolz, L., Blake, C., Abdalla, F. B., Pen, U., et al. (2017). Erasing the Milky Way: new cleaning technique applied to GBT intensity mapping data. Monthly Notices of the Royal Astronomical Society, 464: 4938-4949
  • Yu, Hao-Ran; Pen, Ue-Li; Zhu, Hong-Ming. (2017). Nonlinear E -mode clustering in Lagrangian space. Physical Review D, 95(4): id.043501
  • Wang, X., Yang, I.S., Pen, U. (2017). Gravitational rotation of polarization: Clarifying the gauge dependence and prediction for double pulsar. Physical Review D (In Press)
  • Liao, Yu-Wei, Chang, Tzu-Ching, Kuo., Pen, Ue-Li., et al. (2016). Accurate Polarization Calibration at 800 MHz with the Green Bank Telescope, The Astrophysical Journal, 833: 1-2
  • Pan, Q., Inman, D., Yu, H.R. Pen, U. (2016) Increasing Fisher Information by Moving-Mesh Reconstruction. Monthly Notices of the Royal Astronomical Society (In Press). p.1-6
  • Emberson, J. D.; Yu, Hao-Ran; Inman, Derek; Zhang, Tong-Jie; Pen, Ue-Li; Harnois-Deraps, Joachim; Yuan, Shuo; Teng, Huan-Yu; Zhu, Hong-Ming; Chen, Xuelei; Xing, Zhi-Zhong. (2016). Cosmological neutrino simulations at extreme scale. Research in Astronomy and Astrophysics, 17 (8); doi:10.1088/1674-4527/17/8/85
  • Inman, Derek; Yu, Hao-Ran; Zhu, Hong-Ming; Emberson, J. D.; Pen, Ue-Li; Zhang, Tong-Jie; Yuan, Shuo; Chen, Xuelei; Xing, Zhi-Zhong. (2016). Measurement of the Cold Dark Matter-Neutrino Dipole in the TianNu Simulation. Phys. Rev. D 95, 083518 1-6
  • Turok, N, Pen, U. (2016). Shocks in the Early Universe. Physical Review Letters. 117: 131301_1-131301_5
  • Yu, H.R., Emberson, J. D.; Inman, D., Zhang, T.J., Pen, U. et al. (2016). Differential Neutrino Condensation onto Cosmic Structure. Nature Astronomy (In press) p.1-15
  • Oppermann, Niels; Connor, Liam D.; Pen, Ue-Li. (2016). The Euclidean distribution of fast radio bursts. Monthly Notices of the Royal Astronomical Society. 461 (1): p.984-987
  • Berger, Philippe; Newburgh, Laura B.; Amiri, Mandana; Bandura, Kevin; Cliche, Jean-François; Connor, Liam; Deng, Meiling; Denman, Nolan; Dobbs, Matt; Fandino, Mateus; Gilbert, Adam J.; Good, Deborah; Halpern, Mark; Hanna, David; Hincks, Adam D.; Hinshaw, Gary; Höfer, Carolin; Johnson, Andre M.; Landecker, Tom L.; Masui, Kiyoshi W.; Mena Parra, Juan; Oppermann, Niels; Pen, Ue-Li; Peterson, Jeffrey B.; Recnik, Andre; Robishaw, Timothy; Shaw, J. Richard; Siegel, Seth; Sigurdson, Kris; Smith, Kendrick; Storer, Emilie; Tretyakov, Ian; Van Gassen, Kwinten; Vanderlinde, Keith; Wiebe, Donald. (2016). Holographic beam mapping of the CHIME pathfinder array. SPIE. 9906: id. 99060D 1-16
  • Limits on the ultra-bright Fast Radio Burst population from the CHIME Pathfinder. CHIME Scientific Collaboration; Amiri, Mandana; Bandura, Kevin; Berger, Philippe; Bond, J. Richard; Cliche, Jean-François; Connor, Liam; Deng, Meiling; Denman, Nolan; Dobbs, Matt; Domagalski, Rachel Simone; Fandino, Mateus; Gilbert, Adam J; Good, Deborah C.; Halpern, Mark; Hanna, David; Hincks, Adam D.; Hinshaw, Gary; Höfer, Carolin; Hsyu, Gilbert; Klages, Peter; Landecker, T. L.; Masui, Kiyoshi; Mena-Parra, Juan; Newburgh, Laura; Oppermann, Niels; Pen, Ue-Li; Peterson, Jeffrey B.; Pinsonneault-Marotte, Tristan; Renard, Andre; Shaw, J. Richard; Siegel, Seth R.; Sigurdson, Kris; Smith, Kendrick M.; Storer, Emilie; Tretyakov, Ian; Vanderlinde, Keith; Wiebe, Donald V. arXiv: 1702.08040
  • A self-consistency check for unitary propagation of Hawking quanta. Baker, Daniel; Kodwani, Darsh; Pen, Ue-Li; Yang, I-Sheng. arXiv: 1701.04811
  • An efficient method for removing point sources from full-sky radio interferometric maps. Berger, Philippe; Oppermann, Niels; Pen, Ue-Li; Shaw, J. Richard. arXiv: 1612.03255
  • Nonlinear Reconstruction. Zhu, Hong-Ming; Yu, Yu; Pen, Ue-Li; Chen, Xuelei; Yu, Hao-Ran. arXiv: 1611.09638
  • Recovering lost 21 cm radial modes via cosmic tidal reconstruction. Zhu, Hong-Ming; Pen, Ue-Li; Yu, Yu; Chen, Xuelei. arXiv: 1610.07062
  • An Efficient Real-time Data Pipeline for the CHIME Pathfinder Radio Telescope X-Engine. arxiv. IEEE International Conference on Application-specific Systems, Architectures and Processors, , Paper


  • '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