I like to view astrophysical problems from both perspectives of physics and statistics in survey data. I am interested in observational cosmology and astrophysics.
Non-Gaussianities are ubiquitous in astronomical data, but challenging to quantify. The scattering transform provides a brand new vocabulary for describing patterns and textures in non-Gaussian fields (and 1D signals). It borrows ideas from convolutional neural nets (CNNs) but yields robust and interpretable statistics in a deterministic way.
On weak lensing mass maps, I show the scattering transform extracts as much cosmological information as state-of-the-art CNNs and outperforms classic statistics. Read this astrobites blog, or click the figure below to read our paper.
I also work on several projects about white dwarfs, the destiny of most stars in the universe. Using data from the Gaia space mission, I revealed that some white dwarfs cool extremely slowly and that some are merger products. My work has led to two papers (click the figures below), one of which was highlighted by astrobites and AAS Nova.
While working on white dwarfs, I built a publically available package
WD_models in python for transformation between white dwarf photometry and physical properties.
Department of Physics and Astronomy
2019-present, Ph.D. candidate
Advisor: Prof. Brice Ménard
Department of Astronomy
Advisor: Prof. Eric Peng (彭逸西)
Cheng, S., Two delays in white dwarf evolution revealed by Gaia, 2020, Proceedings of IAU Symposium No. 357, in press
Cheng, S., Cummings, J. D., Ménard, B., A Cooling Anomaly of High-mass White Dwarfs, 2019, ApJ, 886, 100
Cheng, S., Cheng, S., Meteor spectral observation with DSLR, normal lens and prism, 2011, JIMO, 39, 39
Lu, C. X., Schlaufman, K. C., Cheng, S., An Increase in Small-planet Occurrence with Metallicity for Late-type Dwarf Stars in the Kepler Field and Its Implications for Planet Formation, 2020, AJ, accepted
Camisassa, M. E., Althaus, L. G., Torres, S., Córsico, A. H., Cheng, S., Rebassa-Mansergas, A., Forever young white dwarfs: when stellar ageing stops, 2020, submitted to Nature Communications, arXiv:2008.03028
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3400 N. Charles St., Johns Hopkins University
Baltimore, MD21218, USA