The Primordial Inflation Explorer (PIXIE): Mission Design and Science Goals
arxiv(2024)
摘要
The Primordial Inflation Explorer (PIXIE) is an Explorer-class mission
concept to measure the energy spectrum and linear polarization of the cosmic
microwave background (CMB). A single cryogenic Fourier transform spectrometer
compares the sky to an external blackbody calibration target, measuring the
Stokes I, Q, U parameters to levels 200 Jy/sr in each 2.65 degree diameter
beam over the full sky, in each of 300 frequency channels from 28 GHz to 6 THz.
With sensitivity over 1000 times greater than COBE/FIRAS, PIXIE opens a broad
discovery space for the origin, contents, and evolution of the universe.
Measurements of small distortions from a CMB blackbody spectrum provide a
robust determination of the mean electron pressure and temperature in the
universe while constraining processes including dissipation of primordial
density perturbations, black holes, and the decay or annihilation of dark
matter. Full-sky maps of linear polarization measure the optical depth to
reionization at nearly the cosmic variance limit and constrain models of
primordial inflation. Spectra with sub-percent absolute calibration spanning
microwave to far-IR wavelengths provide a legacy data set for analyses
including line intensity mapping of extragalactic emission and the cosmic
infrared background amplitude and anisotropy. We describe the PIXIE instrument
sensitivity, foreground subtraction, and anticipated science return from both
the baseline 2-year mission and a potential extended mission.
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