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Ue-Li Pen

Portrait de Ue-Li Pen
Associate Faculty
Canadian Institute for Theoretical Astrophysics (CITA)

Area of Research:
Cosmology

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

Awards

  • Governor-General"s Innovation Awards (2020) (shared with the CHIME collaboration)
  • 1/347 share of EHT breakthrough prize
  • Simons Research Award (deferred from 2019 due to admin duties).
  • Humboldt Research Award - Alexander von Humboldt-Stiftung - 89,603, Humboldt Foundation, Prize / Award, The award is valued at euro 60,000.

Recent Publications

  • Event Horizon Telescope Collaboration. (2020). THEMIS: A Parameter Estimation Framework for the Event Horizon Telescope. The Astrophysical Journal. 897(2). http://dx.doi.org/10.3847/1538-4357/ab91a4
  • Amiri, M., Andersen, B., Bandura, K. et al. Periodic activity from a fast radio burst source. Nature 582, 351-355 (2020). https://doi.org/10.1038/s41586-020-2398-2
  • Keating, Laura C.; Pen, Ue-Li. (2020). Exploring the dispersion measure of the Milky Way Halo. Monthly Notices of the Royal Astronomical Society: Letters. 496(1): 106-110.
  • Yu, Hao-Ran; Motloch, Pavel; Pen, Ue-Li; Yu, Yu; Wang, Huiyuan; Mo, Houjun; Yang, Xiaohu; Jing, Yipeng. (2020). Probing Primordial Chirality with Galaxy Spins. Physical Review Letters. 124(10). http://dx.doi.org/10.1103/PhysRevLett.124.101302
  • Fonseca, E.; Andersen, B. C.; Bhardwaj, M.; Chawla, P.; Good, D. C.; Josephy, A.; Kaspi, V. M.; Masui,K. W.; Mckinven, R.; Michilli, D.; Pleunis, Z.; Shin, K.; Tendulkar, S. P.; Bandura, K. M.; Boyle, P. J.; Brar,C.; Cassanelli, T.; Cubranic, D.; Dobbs, M.; Dong, F. Q. Gaensler, B. M.; Hinshaw, G.; Landecker, T.L.; Leung, C.; Li, D. Z.; Lin, H. -H.; Mena-Parra, J.; Merryfield, M.; Naidu, A.; Ng, C.; Patel, C.; Pen, U.; Rafiei-Ravandi, M.; Rahman, M.; Ransom, S. M.; Scholz, P.; Smith, K. M.; Stairs, I. H.; Vanderlinde, K.; Yadav, P.; Zwaniga, A. V. (2020). Nine New Repeating Fast Radio Burst Sources from CHIME/FRB. The Astrophysical Journal Letters. 891(1) http://dx.doi.org/10.3847/2041-8213/ab7208
  • Ade, P. A. R.; Anderson, C. J.; Barrentine, E. M.; Bellis, N. G.; Bolatto, A. D.; Breysse, P. C.; Bulcha, B.T.; Cataldo, G.; Connors, J. A.; Cursey, P. W.; Ehsan, N.; Grant, H. C.; Essinger-Hileman, T. M.; Hess, L. A.; Kimball, M. O.; Kogut, A. J.; Lamb, A. D.; Lowe, L. N.; Mauskopf, P. D.; McMahon, J. Mirzaei, M.; Moseley, S. H.; Mugge-Durum, J. W.; Noroozian, O.; Pen, U.; Pullen, A. R.; Rodriguez, S.; Shirron, P. J.; Somerville, R. S.; Stevenson, T. R.; Switzer, E. R.; Tucker, C.; Visbal, E.; Volpert, C. G.; Wollack, E. J.; Yang, S. (2020). The Experiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM). Journal of Low Temperature Physics. http://dx.doi.org/10.1007/s10909-019-02320-5
  • Marcote, B.; Nimmo, K.; Hessels, J. W. T.; Tendulkar, S. P.; Bassa, C. G.; Paragi, Z.; Keimpema, A.; Bhardwaj, M.; Karuppusamy, R.; Kaspi, V. M.; Law, C. J.; Michilli, D.; Aggarwal, K.; Andersen, B.; Archibald, A. M.; Bandura, K.; Bower, G. C.; Boyle, P. J.; Brar, C.; Burke-Spolaor, S. Butler, B. J.; Cassanelli, T.; Chawla, P.; Demorest, P.; Dobbs, M.; Fonseca, E.; Giri, U.; Good, D. C.; Gourdji, K.; Josephy, A.; Kirichenko, A. Yu.; Kirsten, F.; Landecker, T. L.; Lang, D.; Lazio, T. J. W.; Li, D. Z.; Lin, H. -H.; Linford, J. D.; Masui, K.; Mena-Parra, J.; Naidu, A.; Ng, C.; Patel, C.; Pen, U. -L.; Pleunis, Z.; Rafiei-Ravandi, M.; Rahman, M.; Renard, A.; Scholz, P.; Siegel, S. R.; Smith, K. M.; Stairs, I. H.; Vanderlinde, K.; Zwaniga, A. V. (2020). A repeating fast radio burst source localized to a nearby spiral galaxy. Nature. 577(7789): 190-194. http://dx.doi.org/10.1038/s41586-019-1866-z
  • Ue-Li Pen. (2018). The nature of fast radio bursts. Nature Astronomy. 2: 842-844.
  • Roy, Jayanta; Chengalur, Jayaram N.; Pen, Ue-Li. (2018). A Post-correlation Beamformer for Time-domain Studies of Pulsars and Transients. The Astrophysical Journal. 864(2): 161-169.
  • Zhu, Hong-Ming; Pen, Ue-Li; Yu, Yu; Chen, Xuelei. (2016). Recovering lost 21 cm radial modes via cosmic tidal reconstruction. Physical Review D. 98(4): id.043511.
  • Inman, Derek; Pen, Ue-Li; Villaescusa-Navarro, Francisco. (2019). Dipole distortions in the intergalactic medium. Monthly Notices of the Royal Astronomical Society. 487(3): 4181-4189.http://dx.doi.org/10.1093/mnras/stz1542
  • The Event Horizon Telescope Collaboration. (2019). The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project. The Astrophysical Journal. 244(2): id.26. http://dx.doi.org/10.3847/1538-4365/ab29fd
  • Zhu, Hong-Ming; Pen, Ue-Li; Yu, Yu; Chen, Xuelei. (2018). Recovering lost 21 cm radial modes via cosmic tidal reconstruction. Physical Review D. 98(4): id.043511.
  • Yu, Hao-Ran; Pen, Ue-Li; Wang, Xin. (2018). CUBE: An Information-optimized Parallel Cosmological Nbody Algorithm. The Astrophysical Journal Supplement Series. 237(2): id 24.
  • The CHIME/FRB Collaboration. (2018). The CHIME Fast Radio Burst Project: System Overview.The Astrophysical Journal. 863(1): id.48.
  • Li, Dongzi; Zhu, Hong-Ming; Pen, Ue-Li. Cross-correlation of the kinematic Sunyaev-Zel'dovich effect and 21 cm intensity mapping with tidal reconstruction. Physical Review Research. 100(2): id.023517.http://dx.doi.org/10.1103/PhysRevD.100.023517
  • Kodwani, Darsh; Meerburg, P. Daniel; Pen, Ue-Li; Wang, Xin. (2019). Initial conditions of the Universe: A sign of the sine mode. Physical Review Research. 99(12): id.123518. http://dx.doi.org/10.1103/PhysRevD.99.123518
  • Yu, Hao-Ran; Pen, Ue-Li; Wang, Xin. (2019). Parity-odd neutrino torque detection. Physical Review Research. 99(12): id.123532.http://dx.doi.org/10.1103/PhysRevD.99.123532
  • Li, Dongzi; Lin, Fang Xi; Main, Robert; Pen, Ue-Li; van Kerkwijk, Marten H.; Yang, I.-Sheng. (2019).Constraining magnetic fields through plasma lensing: application to the Black Widow pulsar. Monthly Notices of the Royal Astronomical Society. 484(4): 5723-5733.
  • Event Horizon Telescope Collaboration; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Balokovi?, Mislav; Barrett, John; and 212 coauthors.(2019). First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring. The Astrophysical Journal Letters. 875(7): id. L5.
  • Event Horizon Telescope Collaboration; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Asada, Keiichi;Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Balokovi?, Mislav; Barrett, John; and 339 coauthors.(2019). First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole. The Astrophysical Journal Letters. 875(1): id. L1.
  • Event Horizon Telescope Collaboration; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Balokovi?, Mislav; Barrett, John; and 206 coauthors.(2019). First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole. The Astrophysical Journal Letters. 875(7): id. L4.
  • Event Horizon Telescope Collaboration; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Balokovi?, Mislav; Barrett, John; and 208 coauthors.(2019). First M87 Event Horizon Telescope Results. III. Data Processing and Calibration. The Astrophysical Journal Letters. 75(1): id. L3. ,
  • Event Horizon Telescope Collaboration; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Balokovi?, Mislav; Barrett, John; and 332 coauthors. (2019). First M87 Event Horizon Telescope Results. II. Array and Instrumentation.The Astrophysical Journal Letters. 875(1): id. L2. ,
  • Event Horizon Telescope Collaboration; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Balokovi?, Mislav; Barrett, John; and 205 coauthors.(2019). First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole.The Astrophysical Journal Letters. 875(7): id L6. ,
  • CHIME/FRB Collaboration. (2020). A bright millisecond-duration radio burst from a Galactic magnetar. Nature.http://arxiv.org/abs/2005.10324
  • Jow, Dylan L.; Foreman, Simon; Pen, Ue-Li; Zhu, Wei. (2020). Wave effects in the microlensing of pulsars and FRBs by point masses. arXiv. http://arxiv.org/abs/2002.01570
  • Inman, Derek; Pen, Ue-Li; Villaescusa-Navarro, Francisco. (2018). Dipole Distortions in the Intergalactic Medium. arXiv:1812:02148.
  • Hao-Ran Yu, Ue-Li Pen, Xin Wang. (2018). Parity-odd Neutrino Torque Detection. ariv:18010.11784.
  • Kodwani, Darsh; Meerburg, P. Daniel; Pen, Ue-Li; Wang, Xin. (2019). Initial conditions of the universe: A sign of the sine mode. arXiv: 1903.05042
  • Yu, Hao-Ran; Yu, Yu; Motloch, Pavel; Pen, Ue-Li; Wang, Huiyuan; Mo, Houjun. (2019). Probing primordial chirality with galaxy spins. arXiv: 1904.01029.
  • Pen, Ue-Li. (2020). Nonlinear Reconstruction: the Cosmic Web Inside Out. the Lorentz Center workshop. Leiden University, Netherlands. Lorentz Center.
  • Luo, J.; Pen, U.; Van Kerkwijk, M.; Demorest, P.; Main, R. (2020). Is the Black Widow Pulsar Eclipsed by its Companion?. Bulletin of the American Astronomical Society. 235th American Astronomical Society meeting, Honolulu, United States. American Astronomical Society.
  • Pen. Ue-Li. (2019). The CHIME Telescope. Arecibo IPS Workshop. Puerto Rico.
  • Pen. Ue-Li. (2019). Cosmology and fundamental physics with FRBs. Cosmological Frontiers in Fundamental Physics 2019. Waterloo, Canada. Perimeter Institute.
  • Pen. Ue-Li. (2019). Synergy of Plasma Lensing and Gravitational Lensing. Gravity meets Plasma workshop. South-Western Institute for Astronomy Research, China.
  • Pen. Ue-Li. (2019). Interstellar Scintillation Theory and Experimentation: the Potential of 1-D Scintillation Screens in the Interstellar Medium. Scintillating Science: Cutting-Edge Science Achieved Through the Observations of Radio Scintillation Conference. South Africa National Space Agency , South Africa.
  • Pen. Ue-Li. (2019). 21cm intensity mapping: current results and future potential. Future of Canadian Radio Astronomy Workshop. the Dominion Radio Astrophysical Observatory, British Columbia, Canada.

Seminars

  • "the Stockert Radioteleskop upgrade". Dunlap Institute for Astronomy and Astrophysics, University of Toronto. Toronto, Canada. Apr., 20. 20 mins.
  • "Gravitational Waves: Resolution, Sources, Confusion". Max Planck Institute for Radio Astronomy. Bonn, Germany. Feb., 19. 60 mins
  • "Galaxy spin: a cosmic fossil". Albert-Einstein-Institute and the Leibniz-Institute for Astrophysics. Potsdam, Germany. Feb., 20. 45 mins.
  • "Fast Radio Bursts: CHIME and beyond". Academia Sinica. Taipei, Taiwan. Jan., 16. 45 mins.
  • "Fast Radio Bursts: present and future". Oxford University. The United Kingdom. Nov., 25. 45 mins.
  • "CHIME and beyond". Laboratoire d'Annecy-le-Vieux de Physique Théorique. Annecy, France. Nov., 14. 60 mins.
  • "Gravitational Waves".Max Planck Institute for Theoretical Astrophysics. Bonn, Germany. Oct., 16. 30 mins.
  • "Probing cosmic initial conditions with galaxy spin vector."Academia Sinica Institute of Astronomy and Astrophysics, National Taiwan University, Taiwan. Jun., 3. 60 mins.
  • "the Stockert Radioteleskop upgrade". Dunlap Institute for Astronomy and Astrophysics, University of Toronto. Toronto, Canada. Apr., 20. 20 mins.