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Astrophysics · Dark Matter Research

Dimple Sarnaaik

5th Year PhD Candidate · University of Southern California

"Searching for the invisible scaffolding of the universe."

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01 · About
Dimple Sarnaaik

Studying the dark
side of the universe

I'm a 5th year PhD candidate in the Department of Physics & Astronomy at the University of Southern California. My research focuses on constraining dark matter models through astrophysical and computational methodologies — working at the intersection of N-body simulations, semi-analytic modeling, and observational forecasting.

My primary research is with Dr. Andrew Benson at Carnegie Observatories, where I develop and calibrate Galacticus — an open-source semi-analytic model of galaxy formation — to beyond-CDM dark matter models using MCMC sampling on large N-body simulation suites.

I also work with Prof. Kris Pardo at USC, building forward-modeling pipelines to forecast astrometric weak lensing signatures of dark matter subhalos in mock Nancy Grace Roman Space Telescope data.

University
USC
Advisors
Kris Pardo & Andrew Benson
Year
5th Year PhD Candidate
Location
Los Angeles, CA
02 · Research

Dark Matter at the Frontier

I develop observational and computational tools to distinguish between dark matter models by probing structure at sub-galactic scales — where different candidates leave distinct signatures.

Techniques
Gravitational /Astrophysical ProbesTheory &Model BuildingSimulations(N-body / Hydro)
DM Models
Project 01 · Fall 2022–Present
Dr. Andrew Benson's Research Group · Carnegie Observatories

Merger Tree Calibration to Beyond-CDM

Calibrating Galacticus — an open-source semi-analytic model of galaxy formation — to beyond-CDM dark matter models using MCMC sampling on large N-body simulation datasets.

MCMCN-body SimulationsSemi-analytic ModelingMerger Trees
Fuzzy DMWIMPsSIDM
Learn more →
Project 02 · Fall 2022–Present
Dr. Kris Pardo's Research Group · USC

Probing Dark Matter Subhalo Populations with the Nancy Grace Roman Telescope

Building analysis modules to probe weak lensing signatures across multiple dark matter models, with MCMC forward-modeling of astrometric weak lensing effects in mock Roman Space Telescope data.

Forward ModelingWeak LensingMCMCGravitational Probes
WIMPsFuzzy DMSIDM
Learn more →
Project 03 · Summer 2020–2021
Dr. Vera Gluscevic's Research Group · USC

Observational Constraints on Dark Matter–Electron Interactions

Constrained dark matter–electron interaction cross-sections via MCMC sampling and the CLASS code on a high-performance computing cluster, resulting in a publication in Physical Review D.

MCMCBayesian AnalysisHPCCLASS Code
WIMPs
Learn more →
03 · Publications

Research Output

2021
Observational constraints on dark matter scattering with electrons
Physical Review D, 104(10), 103521 · D. V. Nguyen, D. Sarnaaik, K. K. Boddy, E. O. Nadler, V. Gluscevic
WIMPsMCMCBayesian AnalysisHPC
arXiv
Peer Reviewed
2025
Probing Dark Matter Subhalo Populations with the Nancy Grace Roman Telescope
In preparation · D. Sarnaaik, et al.
WIMPsFuzzy DMSIDMForward ModelingWeak LensingMCMC
In Preparation
2025
Merger Tree Calibration to Beyond-CDM
In preparation · D. Sarnaaik, et al.
Fuzzy DMSIDMWIMPsMCMCN-body SimulationsSemi-analytic Modeling
In Preparation
2025
"Astronomy across barriers"
The Lab Report, Volume 2 — USC Department of Physics and Astronomy · D. Sarnaaik
Science Writing
04 · CV

Curriculum Vitae

Download Full CV (PDF)
Education
2021–Present
Doctor of Philosophy, Astrophysics
University of Southern California
Primary advisor: Dr. Andrew Benson (Carnegie Observatories) · Co-advisor: Prof. Kris Pardo (USC)
2017–2021
Bachelor of Science, Physics–Computer Science · Minor in Astronomy
University of Southern California
GPA: 3.76 · Astronomy GPA: 3.9 · Dean's List 2017–2021
Technical Skills
Programming
PythonC++GitLaTeX
Computational
MCMCBayesian AnalysisN-body SimulationsHPC / SlurmBig Data
Modeling
GalacticusCLASS CodeSemi-analytic ModellingForward Modeling
Communication
Science CommunicationPublic OutreachTechnical WritingMentorship
Awards & Honors
2025
Rockwell Dennis Hunt Scholastic Award ($5,000)
USC
2024
Galactic Leader Award
Cosmolab
2023–24
USC Dornsife Graduate Fellowship ($35,700)
USC Dornsife College
2023
Rockwell Dennis Hunt Scholastic Award, Honorable Mention ($1,000)
USC
2021–22
GSG Professional Development Fund Award ($500/year)
USC
2020–21
Goel Family Scholarship ($5,000)
USC Continuing Student Scholarship
2020
Summer Undergraduate Research Fund Award ($3,000)
USC
2019–21
Student Opportunity for Academic Research Award ($1,000/year)
USC
2018–20
Women in Science and Engineering Research Fellowship ($500/semester)
USC WiSE
2017–21
Dean's List
USC Dornsife College
Service & Outreach
Women+ in Physics (W+iP) — Co-Founder
USC · 2024–Present
Graduate Association of Students in Physics (GASP) — President
USC · 2022–2024
Teaching Assistant
USC Department of Physics & Astronomy · Fall 2021–Present
Skype a Scientist — Contributing Scientist
2023–2024, 2026
Letter to a Pre-Scientist — STEM Pen Pal Volunteer
2023–2024
Undergraduate Research Symposium — Judge, Physical Sciences
USC · 2026
The Lab Report, USC — Science Journalist / Contributing Author
2026–Present
Society of Physics Students (SPS) — Co-President
USC · 2019–2021
05 · Talks

Presentations

Seminars, conference talks, and posters presenting my research on dark matter at various venues.

PosterFall 2025

Merger tree calibration to beyond-CDM dark matter models

Galaxy Formation & Evolution in Southern California (GALfresca)
Southern California

Poster presenting results on calibrating Galacticus' semi-analytic model to beyond-CDM dark matter models using MCMC sam

TalkSpring 2025

Dark matter subhalo populations and constraints from the Nancy Grace Roman Space Telescope

APS April Meeting
Anaheim, CA

Talk on forward-modeling astrometric weak lensing signatures of dark matter subhalos in mock Roman Space Telescope data

PanelistSpring 2024

Panelist — academic research, leadership, and applying to graduate school

Conference for Undergraduate Women in Physics (CUWiP), APS
USC

Panelist representing USC — shared insights on academic research, leadership in physics organizations, and applying to g

PosterSpring 2024

Dark matter weak lensing constraints predicted for the Roman Space Telescope

Out in STEM (oSTEM)

Poster on dark matter weak lensing constraints predicted for the Nancy Grace Roman Space Telescope across multiple DM mo

PosterFall 2023

Dark matter weak lensing constraints for the Roman Space Telescope — preliminary results

Physics Departmental Conference, USC
Los Angeles, CA

Preliminary results on dark matter weak lensing constraints for the Roman Space Telescope using forward-modeling pipelin

PosterSpring 2019–2021

New constraints on dark matter–electron interactions

Conference for Undergraduate Women in Physics (CUWiP), APS

Presented new constraints on dark matter–electron interaction cross-sections derived from MCMC sampling with the CLASS B

PosterSpring 2019

Solar rotation data — Dr. Rhodes Research Group

Undergraduate Research Symposium, USC
Los Angeles, CA

Contributed to poster presenting data visualizations of solar observations for the Solar Internal Structure and Dynamics

More talks coming soon
07 · Beyond Research

Interests

Science doesn't happen in a vacuum. I believe deeply in building community, opening doors, and ensuring that physics — and the people doing it — reflect the full breadth of humanity.

Women+ in Physics

Co-founded USC's first organization dedicated to supporting women and gender minorities in physics. Initiated W+iP Clips — a science communication series highlighting gender minorities in the field.

Science Communication

Contributing author at The Lab Report (USC). Led live virtual sessions through Skype a Scientist for K–8 students on black holes, dark matter, and the Moon. APS StepUp panelist supporting high school physics teachers.

Teaching & Mentoring

Teaching assistant for 5+ years across introductory to advanced physics and astronomy labs at USC. STEM pen pal through Letter to a Pre-Scientist with a 5th grader in North Carolina. Mentored 6 underclassmen through SPS.

Community Building

As GASP President, gathered 100+ student experiences to successfully petition a change in the PhD curriculum and hosted community events for 90+ graduate students. Led astronomy outreach at Foster Elementary School.

Graduate Education Advocacy

Advocate for inclusive and equitable graduate physics education — bringing student concerns directly to the department and creating systemic change in the PhD program at USC.

Astronomy Across Barriers

Authored "Astronomy across barriers" (The Lab Report, Vol. 2), profiling USC faculty efforts to bring astronomy to underserved communities. Passionate about making astrophysics accessible to everyone.

Dimple Sarnaaik · USC Astrophysics · 2026