Ue-Li Pen

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

• -- Humboldt Research Award - Alexander von Humboldt-Stiftung - 89,603, Humboldt Foundation, Prize / Award, The award is valued at euro 60,000. -- Simons Research Award (deferred from 2019 due to admin duties). -- 1/347 share of EHT breakthrough prize

Recent Publications

• Ue-Li Pen. (2018). The nature of fast radio bursts. Nature Astronomy. 2: 842-844.
• 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.
• 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.
• 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
• 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.
• 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.
• 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
• 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
• 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
• 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
• 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 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.
• 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 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. ,
• Zuo, Shifan; Pen, Ue-Li; Wu, Fengquan; Li, Jixia; Stebbins, Albert; Wang, Yougang; Chen, Xuelei. (2019).An Eigenvector-Based Method of Radio Array Calibration and Its Application to the Tianlai Cylinder Pathfinder. The Astrophysical Journal. 157(1): id. 34. ,
• CHIME/FRB Collaboration. (2019). Observations of Fast Radio Bursts at Frequencies down to 400 Megahertz. Nature. 566(7743): 230-234.http://dx.doi.org/10.1038/s41586-018-0864-x
• Wang, Xin; Pen, Ue-Li. (2019). Understanding the Reconstruction of the Biased Tracer. The Astrophysical Journal. 870(2): id. 116. ,
• Mahajan, Nikhil; van Kerkwijk, Marten H.; Main, Robert; Pen, Ue-Li. (2018). Mode Changing and Giant Pulses in the Millisecond Pulsar PSR B1957+20. The Astrophysical Journal Letters. 867(1): id. L2. http://dx.doi.org/10.3847/2041-8213/aae713
• 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.
• Li, Dongzi; Zhu, Hong-Ming; Pen, Ue-Li. (2018). The Cross-correlation of KSZ Effect and 21cm Intensity Mapping with Tidal Reconstruction. arXiv: 1811.05012.
• Simard, Dana; Pen, Ue-Li; Ram Marthi, Visweshwar; Brisken, Walter. (2018). Disentangling interstellar plasma screens with pulsar VLBI: Combining auto- and cross-correlations. arXiv: 1810.07231.

Seminars

• Intensity Mapping Workshop, Simons Foundation, March 21, 2019, 18 minutes
• Pulsar Scintillometry, Tata Institute, March 20, 2019, 22 minutes
• Fast Radio Bursts, Weizmann Institute, Dec 12, 2018
• Galaxy spins, UC Berkeley, Nov 5 2018
• CASCA centenary lecture, "Canadian Theoretical Astrophysics", May 26, 2018