Research and Teaching Record

Curriculum Vitae

Education, research experience, talks, teaching, and skills.

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General Information

Name
Yiqi "Andrew" Liu
Location
Princeton, NJ, United States
Email
andrew.liu@princeton.edu
Telephone
(667) 218-8691
LinkedIn
yiqi-liu-andrew

Education

  • Expected Jun 2029

    Ph.D. in Physics

    Princeton University, Princeton, New Jersey, United States

    • Advisor: Jo Dunkley
    • Research interests: Cosmic Microwave Background, component separation, diffuse Galactic foregrounds, statistical inference, Monte Carlo simulation, large-scale data analysis, and harmonic-space analysis.
  • Jan 2025

    M.A. in Physics

    Princeton University, Princeton, New Jersey, United States

  • May 2023

    B.S. in Applied Mathematics & Statistics, Physics, and Mathematics

    Johns Hopkins University, Baltimore, Maryland, United States

    • GPA: 3.99 / 4.00 (General Honors and Departmental Honors in all majors)
    • Minor: Computer Science

Selected Awards

  • 2023
    • Donald E. Kerr Memorial Award, JHU top 2 graduating seniors majoring in physics
    • Applied Math and Statistics Achievement Award, JHU top 6 graduating seniors majoring in applied math and statistics
  • 2022
    • Sigma Pi Sigma Physics Honors Society
    • Provost's Undergraduate Research Award, JHU funded research support
  • 2020 - 2021
    • Bloomberg Distinguished Professor Research Fellowship x2
  • 2020 - 2022
    • Dean's List

Selected Publications

Research Experience

  • 2023 - Present

    Graduate Researcher | Simons Observatory

    Princeton, NJ | Mentors: Jo Dunkley, Susanna Azzoni

    • Developed per-scale regression-based component separation algorithms to extract weak cosmological signals from noisy high-dimensional data.
    • Investigated non-Gaussian statistics for next-generation foreground cleaning.
    • Demonstrated that dust complexity biases cosmological inference using MCMC and Bayesian analysis.
    • Quantified robustness of SO pipelines under various foreground complexity scenarios.
    • Implemented pipelines for SO x Planck cross-correlation to validate instrument performance.
  • 2019 - 2023

    Undergraduate Researcher | Cosmology Large Angular Scale Surveyor

    Baltimore, MD | Mentors: Charles L. Bennett, Tobias A. Marriage, Ivan L. Padilla

    • Implemented and optimized a minimum-variance estimator (Needlet Internal Linear Combination) for multi-frequency signal decomposition.
    • Built polarization-based foreground masks and benchmarked estimator performance across frequency bands.
    • Developed and tested point-source identification algorithms using Fourier-space filtering techniques.
    • Created Python routines to detect temporal anomalies via rolling-dispersion diagnostics in time-series data.
  • 2021 - 2023

    Undergraduate Researcher | Zakamska Astrophysics Group

    Baltimore, MD | Mentors: Nadia L. Zakamska, Hsiang-Chih Hwang

    • First-authored a publication modeling complex binary star systems using spectral decomposition and time-series fitting.
    • Automated a Python-based photometric and spectral analysis pipeline for feature extraction in both time and frequency domains.

Selected Talks and Presentations

  • 2026 Mar

    Simons Observatory: Assessing and Modeling Foreground Complexity in CMB Analyses

    2026 American Physics Society Global Physics Summit, Denver, CO

  • 2025 Oct

    The impact of dust complexity on the recovery of r

    Pan-Experiment Galactic Science Group, Los Angeles, CA

  • 2025 Jul

    From the Impact of Dust Complexity to Beyond

    2025 SO Collaboration Meeting, Philadelphia, PA

  • 2025 Jun

    Understanding the impact of dust complexity on the recovery of the tensor-to-scalar ratio

    246th Meeting of the American Astronomical Society, Anchorage, AK

  • 2024 Jul

    Understanding the impact of dust complexity on bias in r

    2024 SO Collaboration Meeting, Chicago, IL

  • 2023 Mar

    CMB analysis using the global-NILC method

    2023 American Physics Society March Meeting, Las Vegas, NV

  • 2023 Jan

    CSS1603+19: a low mass polar at the cataclysmic variable period minimum

    241st Meeting of the American Astronomical Society, Seattle, WA

Teaching

  • 2023 Spring

    Teaching Assistant, EN.553.430/630 Intro to Statistics

    Ugrad and Grad, 82 students

    • Graduate-level introductory statistics course covering stochastic convergence, point estimation, hypothesis testing, and interval estimation.
  • 2022 Fall

    Teaching Assistant, EN.553.633 Monte Carlo Method

    Grad, 60 students

    • Graduate-level course covering pseudo-random number generators and classic Monte Carlo simulation algorithms such as Metropolis-Hastings.
  • 2020/2022 Fall

    Teaching Assistant, AS.171.103 General Physics I

    Ugrad, 23 students over 2 semesters

    • Undergraduate-level introductory physics on classical mechanics.

Skills

Programming
Python, C++, C, SQL, Bash, Mathematica
Scientific Computing
MCMC methods, Bayesian sampling, HPC (Slurm)
Machining
Tormach CNC Mill, Monarch Lathes, Bridgeport Mill
Languages
English (fluent), Mandarin (native)
Other
JupyterLab, LaTeX, Git, SolidWorks, Rowing, Alpine Skiing