RESEARCH
I am a computational and observational cosmologist. My research focuses on the large-scale structures of our universe –– dark matter, halos, filaments, and voids. I aim to elucidate fundamental physics, such as inflation, the nature of dark energy, and neutrino mass, using cosmological observations of the cosmic microwave background and galaxies together with state-of-the-art numerical simulations.
I am the Director of Center for Data-Driven Discovery (CD3) at Kavli IPMU. I am a member of LSST, Simons Observatory (SO), HSC, PFS, Euclid, LiteBIRD, and CMB-S4. I co-chair the LiteBIRD Science Ground Segment Definition Task Force with Ken Ebisawa. I co-lead the HalfDome Cosmological Simulation effort with Adrian Bayer, Zack Li, and Joe DeRose.
I welcome students and postdocs to work with me. Please reach out if you are interested!
Appointments
2023-Present: Director, Center for Data-Driven Discovery, Kavli IPMU2021-Present: Associate Professor, Kavli IPMU, University of Tokyo
2019-2021: BCCP Postdoctoral Fellow, Berkeley Center For Cosmological Physics, UC Berkeley
2016-2019: NSF Postdoctoral Fellow, Department of Astrophysical Sciences, Princeton University
2012 summer: NSF EAPSI/JSPS Summer Program Fellow, Japan Aerospace Exploration Agency
2009-2011: Research Assistant, Astronomy, Columbia University
Education
2011-2016: PhD in Astronomy, Department of Astronomy, Columbia University2006-2008: MA in Human Resources & Industrial Relations, Carlson School of Management, University of Minnesota
2002-2006: BA in Business Management, Guangdong University Of Finance and Economics
Publications
Google Scholar, Arxiv, ADSMentoring
Postdoc:Kateryna Vovk (2023-present, Kavli IPMU, with John Silverman)
Hideki Tanimura (2022-2024, Kavli IPMU) -> Hokkaido science administrator
Junjie Xia (2022-2024, Kavli IPMU) -> SLAC PD
Joaquin Armijo (2022-present, Kavli IPMU)
Graduate:
Keigo Kondo (2025-present, U Tokyo, co-advised with Kenta Hodokezaka)
Miguel Ruiz Granda (2025-present, IFCA, co-advised with Patricio Vielva)
Thomas Venville (2025-present, ANU, as Associate Supervisor)
Matthis Maupas (2024 summer, École Polytechnique visiting IPMU via ILANCE, co-advised with Ievgen Vovk)
Jessica Cowell (2022-present, U Tokyo/Oxford, co-advised with David Alonso)
Yici Zhong (2022-2024, U Tokyo) -> Caltech/Columbia PD
Akira Tokiwa (2022-2025, U Tokyo) -> Industry
Leander Thiele (2021-2022, Princeton) -> IPMU faculty
Daniela Grandón (2021-2023, U Chile) -> Leiden U PD
Adrian Bayer (2020-2023, Berkeley) -> Princeton/CCA PD
Zack Li (2017-2019, Princeton) -> CITA PD
Will Coulton (2017-2018, Princeton) -> Cambridge PD
Gabriela Marques (2017-2019, Observatório Nacional-Rio de Janeiro) -> Florida State PD
Undergraduate:
Veena Krishnaraj (2025 summer, Princeton undergrad visiting IPMU)
Jamie Robinson (2025 summer, Princeton undergrad visiting IPMU)
Mingshen Zhou (2025 summer, USTC undergrad visiting IPMU)
Cooper Jacobus (2024 summer, Berkeley undergrad visiting IPMU, co-advised with Leander Thiele) -> Stanford PhD
Shawn Mobley (2024 summer, Harvard undergrad visiting IPMU, co-advised with Hiromi Yokoyama)
James Sunseri (2020-2023, Berkeley, co-advised with Zack Li) -> Princeton PhD
Darby McCauley (2022, Berkeley) -> UIUC PhD
Geoffrey Zheng (2019, Princeton) -> Yale PhD
Gemma Zhang (2019-2020, Princeton, co-advised with Zack Li and David Spergel) -> Harvard PhD
Ayanna Mathews (2018, Princeton) -> U Chicago PhD
Ryan Golant (2017, Princeton) -> Columbia PhD
Alvaro Ortiz-Vazquez (2015-2016, Columbia, co-advised with Colin Hill) -> Industry
Public Data
I put great effort into releasing my simulations. Here, you can download the cosmological simulation data that my collaborators and I generated: HalfDome Cosmological Simulation, CD3, Columbia Lensing. I thank New Mexico State University (USA) and Instituto de Astrofisica de Andalucia CSIC (Spain) for hosting the Skies & Universes site, which made public access to some of my data possible.Talks
Upcoming:2025/09/25 Invited: Seminar at ISTA, Vienna, Austria
2025/09/22–26 Invited: Workshop "Putting the cosmic large-scale structure on the map: theory meets numerics", Erwin Schrödinger Institute, Vienna, Austria
Past:
2025/05/07 Invited: Colloquium, South-Western Institute For Astronomy Research at Yunnan University, Kunming, China
2025/04/28 Invited: Colloquium, Xiamen University, Xiamen, China
2025/04/14 Invited: Colloquium, GRAPPA, the Center of Excellence in Gravitation and Astroparticle Physics at the University of Amsterdam, Amsterdam, Netherland
2025/03/11 Welcome remark, The Quantum Frontier of Machine Learning Workshop, Kavli IPMU, Japan
2025/01/28 Invited: CMB B-Mode NEXT, KEK, Tsukuba, Japan
2024/12/16-20 Invited: Hitoshi Fest, Kavli IPMU, Kashiwa, Japan
2024/12/09-12 Invited: The Standard Model and Beyond Workshop, UNSW, Sydney, Australia
2024/09/26 Invited: Seminar, ETH Zürich, Switzerland
2024/09/16-22 Invited: Summer School "The Fundamentals", Split, Croatia
2024/06/03 Invited: Seminar, University of Milano-Bicocca, Italy
2024/05/31 Invited: IFPU Colloquim, SISSA, Italy
2024/05/27 Invited: Colloquium, University of Vienna, Austria
2024/05/20-23 Invited: COSMO21: Statistical Challenges in 21st Century Cosmology Conference, Chania, Crete, Greece
2024/03/20 Invited: Colloquim, Hongkong University, Hongkong, China
2024/03/04-06 Invited: KEK Cosmo2024 Workshop, KEK, Tsukuba, Japan
2024/02/26 Invited: LeCosPA-ASIAA Joint Colloquium, National Taiwan University, Taiwan
More (before 2024)
2023/12/08 Invited: "Time-Domain Astronomy and Cosmology in the LSST Era", Kavli IPMU, Kashiwa, Japan
2023/10/30 Contributed: The 14th RESCEU Symposium, University of Tokyo, Tokyo, Japan
2023/10/06 Invited: Seminar, UC Riverside, Riverside, CA, US
2023/10/05 Invited: Seminar, University of Southern California, Los Angeles, CA, US
2023/10/04 Invited: Colloquium, UCLA, Los Angeles, CA, US
2023/09/26 Invited: Seminar, UC Berkeley/LBL, Berkeley, CA, US
2023/09/14 Contributed: Subaru in the era of Euclid, NAOJ Mitaka campus, Japan
2023/09/01 Invited: Colloquium (remote), Statistical Methods and Machine Learning in High Energy Physics Workshop, ICTS, Bengaluru, India
2023/07/31 Invited: CMB-S4 Collaboration Meeting, SLAC, California, US
2023/02 Invited: "ML at HEP" Workshop, KEK, Japan
2022/12 Invited: "Unsolved Problems in Astrophysics and Cosmology" Workshop, Jerusalem, Israel
2022/10 Invited: Colloquium (remote), Tsinghua University, Beijing, China
2022/09 Invited: Colloquium (remote), Shanghai Jiao Tong University, Shanghai, China
2022/08 Invited: Seminar (remote) for the FoPM program at The University of Tokyo, Japan
2022/08 Invited: “Consensus Cosmic Shear in the 2020s” IAU-FM3, Busan, South Korea
2022/07 Invited: Seminar (remote), Beyond AI, Japan
2022/07 Invited: Colloquium, JAXA/ISAS, Sagamihara, Japan
2022/05 Invited: “From Planck to the future of CMB” Conference, Ferrara, Italy
2022/04 Invited: Seminar (remote) University of Sydney & The University of New South Wales, Sydney-CPPC
2022/03 Invited: Seminar (remote) at Imperial College Particle Phenomenology, Particle Astrophysics & Cosmology (3-PAC)
2021/07 Contributed: virtual talk at Cosmology from Home
2021/06 Invited: Seminar (remote), University Observatory Munich at the Ludwig Maximilians University, Munich, Germany
2021/04 Invited: Colloquium (remote), Caltech Astronomy, Pasadena, CA
2021/04 Invited: Colloquium (remote), University of Florida Physics, Gainesville, FL
2021/04 Invited: Colloquium (remote), Texas A&M, College Station, TX
2021/03 Invited: Colloquium (remote), Kavli IPMU, Kashiwa, Japan
2021/03 Invited: Colloquium (remote), University of Southern California, Los Angeles, CA
2021/01 Invited: Colloquium (remote), Aarhus University, Aarhus, Denmark
2020/10 Invited: Colloquium (remote), Florida Tech, Melbourne, FL
2020/10 Invited: Colloquium (remote), Leiden University, Leiden, Netherlands
2020/04 Invited: Seminar (remote) at McGill University, Montreal, Canada
2020/03 Invited: Seminar at UC San Diego, CA
2020/02 Invited: Colloquium at Purdue University, West Lafayette, IN
2019/10 Invited: Seminar at Perimeter Institute, Waterloo, Canada
2019/07 Invited: Precision Investigations of the Neutrino Sector (PINS 2019), SLAC, CA
2019/04 Invited: Seminar at University of Victoria, BC, Canada
2019/04 Invited: Rising Stars in Physics Workshop, Stanford, CA
2019/03 Invited: Dark Universe Seminar at Brandeis University, Boston, MA
2019/03 Invited: Seminar at Columbia University, New York, NY
2019/03 Invited: Princeton Thunch, Princeton, NJ
2019/02 Invited: Seminar at LBNL Institute for Nuclear and Particle Astrophysics, Berkeley, CA
2019/02 Invited: Seminar at New York University, New York, NY
2019/01 Invited: Accurate lensing in the era of precision Cosmology, UC Berkeley, CA
2018/12 Invited: Colloquium at Harvard ITC, Cambridge, MA
2018/11 Invited: Seminar at UBC, Vancouver, Canada
2018/11 Invited: Seminar at Simon Fraser University, Vancouver, Canada
2018/11 Invited: Seminar at TRIUMF, Vancouver, Canada
2018/11 Invited: Colloquium at University of Edinburgh, UK
2018/11 Invited: DAMTP Journal Club at University of Cambridge, UK
2018/11 Invited: Seminar at CEA Saclay, France
2018/10 Invited: Seminar at Institut Henri Poincaré, Paris, France
2018/09 Invited: Colloquium at University of Arizona Theoretical Astrophysics Program, Tucson, AZ
2018/07 Invited: Seminar at Caltech TAPIR, Pasadena, CA
2018/07 Invited: 8th Forum for New Leaders in Space Science, CAS-NAS, Pasadena, CA
2018/07 Invited: Unsolved Problems in Astrophysics and Cosmology, Budapest, Hungary
2018/06 Invited: PASCOS2018, Cleveland, OH
2018/05 Invited: Princeton Astronomy Advisory Council, Princeton, NJ
2018/01 Invited: Seminar at University of Science and Technology of China, Hefei, China
2018/01 Invited: Seminar at Purple Mountain Observatory, Nanjing, China
2018/01 Invited: 7th Forum for New Leaders in Space Science, CAS-NAS, Guangzhou, China
2018/01 Invited: Seminar at University of New South Wales, Sydney, Australia
2018/01 Invited: NSF Astronomy and Astrophysics Postdoctoral Fellows Symposium, Washington D.C.
2018/01 Invited: Modeling the Extragalactic Sky, UC Berkeley, CA
2017/09 Invited: Seminar at Observatório Nacional, Rio de Janeiro, Brasil
2017/09 Invited: Kavli CMB Lensing Workshop, Stanford University, Stanford, CA
2017/05 Invited: Princeton Thunch, Princeton, NJ
2017/03 Invited: Seminar at University of Chicago Kavli Institute for Cosmological Physics, Chicago, IL
2017/03 Invited: Black Hole Network: Supermassive Black Hole Binary Workshop at the Center for Computational Astrophysics, New York, NY
2017/02 Invited: Astrophysics Seminar at Rutgers University, New Brunswick, NJ
2016/10 Invited: Informal Seminar at IAS, Princeton, NJ
2016/10 Invited: HSC Science Discussion at Princeton University, Princeton, NJ
2016/10 Invited: Seminar at University of Pennsylvania, Philadelphia, PA
2016/09 Invited: Seminar at Tsinghua University, Beijing, China
2016/09 Invited: Lunch talk at Peking University, Beijing, China
2016/09 Invited: Seminar at National Astronomical Observatories of China, Beijing, China
2016/07 Contributed: Celebrating a century of gravitational lensing, Leiden, Netherland
2016/05 Contributed: Cross-correlation Spectacular with LSST, Long Island, NY
2016/05 Invited: Columbia University Astronomy Colloquium, New York, NY
2016/03 Contributed: Rencontres de Moriond Cosmology, La Thuile, Italy
2016/01 Contributed: Essential Cosmology for the Next Generation, Cancun, Mexico
2016/01 Contributed: 227th AAS Dissertation Talk, Kissimmee, FL
2015/11 Invited: Astronomy Seminar at University of Hawaii, Honolulu, HI
2015/11 Contributed: JSPS 6th Multidisciplinary Science Forum at UC Davis, Sacramento, CA
2015/11 Invited: Joint Princeton/IAS Cosmology Lunch, Princeton, NJ
2015/07 Contributed: Theoretical and Observational Progress on the LSS, Garching, Germany
2015/05 Invited: Joint Stony Brook/Brookhaven National Lab Cosmology Seminar, Stony Brook, NY
2014/11 Invited: Seminar at Jiaotong University, Shanghai, China
2014/10 Invited: Seminar at National Astronomical Observatories of China, Beijing, China
2014/03 Contributed: Rencontres de Moriond Cosmology, La Thuile, Italy
2014/01 Contributed: Essential Cosmology for the Next Generation, Cabo San Lucas, Mexico
2023/10/30 Contributed: The 14th RESCEU Symposium, University of Tokyo, Tokyo, Japan
2023/10/06 Invited: Seminar, UC Riverside, Riverside, CA, US
2023/10/05 Invited: Seminar, University of Southern California, Los Angeles, CA, US
2023/10/04 Invited: Colloquium, UCLA, Los Angeles, CA, US
2023/09/26 Invited: Seminar, UC Berkeley/LBL, Berkeley, CA, US
2023/09/14 Contributed: Subaru in the era of Euclid, NAOJ Mitaka campus, Japan
2023/09/01 Invited: Colloquium (remote), Statistical Methods and Machine Learning in High Energy Physics Workshop, ICTS, Bengaluru, India
2023/07/31 Invited: CMB-S4 Collaboration Meeting, SLAC, California, US
2023/02 Invited: "ML at HEP" Workshop, KEK, Japan
2022/12 Invited: "Unsolved Problems in Astrophysics and Cosmology" Workshop, Jerusalem, Israel
2022/10 Invited: Colloquium (remote), Tsinghua University, Beijing, China
2022/09 Invited: Colloquium (remote), Shanghai Jiao Tong University, Shanghai, China
2022/08 Invited: Seminar (remote) for the FoPM program at The University of Tokyo, Japan
2022/08 Invited: “Consensus Cosmic Shear in the 2020s” IAU-FM3, Busan, South Korea
2022/07 Invited: Seminar (remote), Beyond AI, Japan
2022/07 Invited: Colloquium, JAXA/ISAS, Sagamihara, Japan
2022/05 Invited: “From Planck to the future of CMB” Conference, Ferrara, Italy
2022/04 Invited: Seminar (remote) University of Sydney & The University of New South Wales, Sydney-CPPC
2022/03 Invited: Seminar (remote) at Imperial College Particle Phenomenology, Particle Astrophysics & Cosmology (3-PAC)
2021/07 Contributed: virtual talk at Cosmology from Home
2021/06 Invited: Seminar (remote), University Observatory Munich at the Ludwig Maximilians University, Munich, Germany
2021/04 Invited: Colloquium (remote), Caltech Astronomy, Pasadena, CA
2021/04 Invited: Colloquium (remote), University of Florida Physics, Gainesville, FL
2021/04 Invited: Colloquium (remote), Texas A&M, College Station, TX
2021/03 Invited: Colloquium (remote), Kavli IPMU, Kashiwa, Japan
2021/03 Invited: Colloquium (remote), University of Southern California, Los Angeles, CA
2021/01 Invited: Colloquium (remote), Aarhus University, Aarhus, Denmark
2020/10 Invited: Colloquium (remote), Florida Tech, Melbourne, FL
2020/10 Invited: Colloquium (remote), Leiden University, Leiden, Netherlands
2020/04 Invited: Seminar (remote) at McGill University, Montreal, Canada
2020/03 Invited: Seminar at UC San Diego, CA
2020/02 Invited: Colloquium at Purdue University, West Lafayette, IN
2019/10 Invited: Seminar at Perimeter Institute, Waterloo, Canada
2019/07 Invited: Precision Investigations of the Neutrino Sector (PINS 2019), SLAC, CA
2019/04 Invited: Seminar at University of Victoria, BC, Canada
2019/04 Invited: Rising Stars in Physics Workshop, Stanford, CA
2019/03 Invited: Dark Universe Seminar at Brandeis University, Boston, MA
2019/03 Invited: Seminar at Columbia University, New York, NY
2019/03 Invited: Princeton Thunch, Princeton, NJ
2019/02 Invited: Seminar at LBNL Institute for Nuclear and Particle Astrophysics, Berkeley, CA
2019/02 Invited: Seminar at New York University, New York, NY
2019/01 Invited: Accurate lensing in the era of precision Cosmology, UC Berkeley, CA
2018/12 Invited: Colloquium at Harvard ITC, Cambridge, MA
2018/11 Invited: Seminar at UBC, Vancouver, Canada
2018/11 Invited: Seminar at Simon Fraser University, Vancouver, Canada
2018/11 Invited: Seminar at TRIUMF, Vancouver, Canada
2018/11 Invited: Colloquium at University of Edinburgh, UK
2018/11 Invited: DAMTP Journal Club at University of Cambridge, UK
2018/11 Invited: Seminar at CEA Saclay, France
2018/10 Invited: Seminar at Institut Henri Poincaré, Paris, France
2018/09 Invited: Colloquium at University of Arizona Theoretical Astrophysics Program, Tucson, AZ
2018/07 Invited: Seminar at Caltech TAPIR, Pasadena, CA
2018/07 Invited: 8th Forum for New Leaders in Space Science, CAS-NAS, Pasadena, CA
2018/07 Invited: Unsolved Problems in Astrophysics and Cosmology, Budapest, Hungary
2018/06 Invited: PASCOS2018, Cleveland, OH
2018/05 Invited: Princeton Astronomy Advisory Council, Princeton, NJ
2018/01 Invited: Seminar at University of Science and Technology of China, Hefei, China
2018/01 Invited: Seminar at Purple Mountain Observatory, Nanjing, China
2018/01 Invited: 7th Forum for New Leaders in Space Science, CAS-NAS, Guangzhou, China
2018/01 Invited: Seminar at University of New South Wales, Sydney, Australia
2018/01 Invited: NSF Astronomy and Astrophysics Postdoctoral Fellows Symposium, Washington D.C.
2018/01 Invited: Modeling the Extragalactic Sky, UC Berkeley, CA
2017/09 Invited: Seminar at Observatório Nacional, Rio de Janeiro, Brasil
2017/09 Invited: Kavli CMB Lensing Workshop, Stanford University, Stanford, CA
2017/05 Invited: Princeton Thunch, Princeton, NJ
2017/03 Invited: Seminar at University of Chicago Kavli Institute for Cosmological Physics, Chicago, IL
2017/03 Invited: Black Hole Network: Supermassive Black Hole Binary Workshop at the Center for Computational Astrophysics, New York, NY
2017/02 Invited: Astrophysics Seminar at Rutgers University, New Brunswick, NJ
2016/10 Invited: Informal Seminar at IAS, Princeton, NJ
2016/10 Invited: HSC Science Discussion at Princeton University, Princeton, NJ
2016/10 Invited: Seminar at University of Pennsylvania, Philadelphia, PA
2016/09 Invited: Seminar at Tsinghua University, Beijing, China
2016/09 Invited: Lunch talk at Peking University, Beijing, China
2016/09 Invited: Seminar at National Astronomical Observatories of China, Beijing, China
2016/07 Contributed: Celebrating a century of gravitational lensing, Leiden, Netherland
2016/05 Contributed: Cross-correlation Spectacular with LSST, Long Island, NY
2016/05 Invited: Columbia University Astronomy Colloquium, New York, NY
2016/03 Contributed: Rencontres de Moriond Cosmology, La Thuile, Italy
2016/01 Contributed: Essential Cosmology for the Next Generation, Cancun, Mexico
2016/01 Contributed: 227th AAS Dissertation Talk, Kissimmee, FL
2015/11 Invited: Astronomy Seminar at University of Hawaii, Honolulu, HI
2015/11 Contributed: JSPS 6th Multidisciplinary Science Forum at UC Davis, Sacramento, CA
2015/11 Invited: Joint Princeton/IAS Cosmology Lunch, Princeton, NJ
2015/07 Contributed: Theoretical and Observational Progress on the LSS, Garching, Germany
2015/05 Invited: Joint Stony Brook/Brookhaven National Lab Cosmology Seminar, Stony Brook, NY
2014/11 Invited: Seminar at Jiaotong University, Shanghai, China
2014/10 Invited: Seminar at National Astronomical Observatories of China, Beijing, China
2014/03 Contributed: Rencontres de Moriond Cosmology, La Thuile, Italy
2014/01 Contributed: Essential Cosmology for the Next Generation, Cabo San Lucas, Mexico
Observing Runs
(Once a while, I observe active galactic nuclei using optical telescopes, hoping to find supermassive black hole binaries...)2018/08/14 Palomar 200" (Co-I)
2018/06/17 Palomar 200" (Co-I)
2016/03/03-03/07 MDM 2.4m Modspec + Echelle (Co-I)
2013/05/01-05/05 MDM 2.4m ModSpec + Templeton 1k (PI)
2011/06/26-07/04 MDM 2.4m CCDS
2010/12/28-2011/01/02 MDM 2.4m OSMOS
2010/06/07-06/08 MDM 2.4m CCDS (PI)
2010/03/12-03/16 MDM 2.4m CCDS
2009/12/14-12/20 MDM 2.4m CCDS & 1.3m Templeton
2009/08/19-08/25 MDM 2.4m CCDS & 1.3m Templeton
2009/05/25-05/28 MDM 2.4m CCDS with Retrocam
2009/03/17-03/18 MDM 2.4m CCDS (Part of an observing class)