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A promising way to measure the distribution of matter on small scales (k ~ 10hMpc^-1) is to use gravitational lensing of the Cosmic Microwave Background(CMB). CMB-HD, a proposed high-resolution, low-noise millimeter survey overhalf the sky, can measure the CMB lensing auto spectrum on such small scalesenabling measurements that can distinguish between a cold dark matter (CDM)model and alternative models designed to solve problems with CDM on smallscales. However, extragalactic foregrounds can bias the CMB lensing autospectrum if left untreated. We present a foreground mitigation strategy thatprovides a path to reduce the bias from two of the most dominant foregrounds,the thermal Sunyaev-Zel'dovich effect (tSZ) and the Cosmic Infrared Background(CIB). Given the level of realism included in our analysis, we find that thetSZ alone and the CIB alone bias the lensing auto spectrum by 0.6 sigma and 1.1sigma respectively, in the lensing multipole range of L in [5000,20000] for aCMB-HD survey; combined these foregrounds yield a bias of only 1.3 sigma.Including these foregrounds, we also find that a CMB-HD survey can distinguishbetween a CDM model and a 10^-22 eV FDM model at the 5 sigma level. Theseresults provide an important step in demonstrating that foregroundcontamination can be sufficiently reduced to enable a robust measurement of thesmall-scale matter power spectrum with CMB-HD.

Mitigating Foreground Bias to the CMB Lensing Power Spectrum for a CMB-HD Survey