The Square Kilometer Array as a Cosmic Microwave Background Experiment
arxiv(2024)
摘要
Contemporary cosmic microwave background (CMB) experiments typically have
observing bands covering the range 20 - 800 GHz. Certain science goals,
including the detection of μ-type distortions to the CMB spectrum and the
characterization of low-frequency foregrounds, benefit from extended
low-frequency coverage, but the standard CMB detector technology is not
trivially adaptable to radio wavelengths. We propose using the upcoming Square
Kilometer Array (SKA) as a CMB experiment, exploiting the immense raw
sensitivity of SKA, in particular in single-dish mode, to measure
medium-to-large-angular-scale modes of the CMB at radio wavelengths. As a
worked example, we forecast the power of SKA combined with the upcoming
LiteBIRD CMB space mission to constrain primordial non-Gaussianity through
measurements of the correlation between anisotropies in the CMB
μ-distortion, temperature, and E-mode polarization fields. We find that
adding SKA data significantly improves the constraints on f_nl, even
for spatially varying low-frequency foregrounds.
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