A search for super-imposed oscillations to the primordial power spectrum in Planck and SPT-3G 2018 data
arxiv(2024)
摘要
We search for super-imposed oscillations linearly or logarithmically spaced
in Fourier wavenumbers in Planck and South Pole Telescope (SPT-3G) 2018
temperature and polarization data. The SPT-3G temperature and polarization data
provide a new window to test these oscillations at high multipoles beyond the
Planck angular resolution and sensitivity. We consider both models with a
constant and a Gaussian modulated amplitude, which correspond to three and four
additional parameters beyond power-law primordial power spectrum for the
templates considered, respectively. We find that each of the four models
considered can provide an improved fit to Planck data, consistently with
previous findings, and to SPT-3G data, always compared to ΛCDM. For a
constant amplitude of the superimposed oscillations, we find tighter
constraints on the amplitude of the oscillations from the combined
Planck/SPT-3G data set than in each individual data sets. When the ranges of
parameters which provide a better fit to Planck and SPT-3G data overlap, as in
the case of Gaussian modulated oscillations, we find a larger Δχ^2 -
- 17 (-16) for logarithmic (linear) oscillations - in a combined
Planck/SPT-3G data set than in each individual data sets. These findings will
be further tested with upcoming CMB temperature and polarization measurements
at high multipoles provided by ongoing ground experiments.
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