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