About
I am a senior research scientist at JPL / Caltech working at the intersection of observational cosmology, radio astronomy, and instrument development. My research centers on line intensity mapping (LIM) — a technique that uses the collective spectral emission of millions of unresolved galaxies to chart the large-scale structure of the Universe across cosmic time.
Through LIM we can efficiently survey enormous cosmological volumes, reaching epochs that are otherwise inaccessible to conventional galaxy surveys. I work across the full stack: from the underlying theory and signal modeling, through instrument design and commissioning, to foreground mitigation and statistical power-spectrum analysis.
My observational program spans from 21-cm hydrogen emission at low and intermediate redshifts, which probes dark energy and large-scale structure, to CO, [CII], Lyman-α, and H-α lines that trace star formation and reionization in the early Universe. I am particularly excited by the scientific potential of upcoming facilities such as SPHEREx, and by the first generation of LIM cross-correlation detections now coming online.
Research
Using the hyperfine transition of neutral hydrogen to map large-scale structure and dark energy constraints at redshifts z ~ 0.1–3, including the landmark GBT cross-correlation detection.
Probing the first billion years with multi-tracer LIM: 21-cm, Lyman-α tomography, and CO/[CII] line intensity maps to reconstruct the timeline of hydrogen reionization.
Developing and analyzing CO, [CII], H-α, and Lyman-α intensity mapping surveys to trace star-formation history and galaxy evolution across cosmic time.
PI of GBT-HIM (800 MHz focal-plane array); key contributor to TIME, SPHEREx, and next-generation LIM instruments. Expertise in foreground cleaning, calibration, and power-spectrum pipelines.
Exploiting cross-correlations between LIM and galaxy, CMB lensing, and other surveys to extract cosmological parameters and beat down systematic foregrounds.
Detecting the stochastic gravitational wave background in the unexplored microhertz band using stellar astrometric deflections from surveys such as Gaia, Roman, and SPHEREx — a unique complement to PTAs and LISA.
Characterizing the magnetized plasma environment of FRBs using radio observations; using FRBs as new probes of the intergalactic medium.
Publications
Experiments & Collaborations
I have been involved in the following experiments and surveys:
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