MG15 - Talk detail |
Participant |
Cabass, Giovanni | |||||||
Institution |
Max Planck Institute for Astrophysics - Karl-Schwarzschild-Straße 1 - Garching bei München - Germany - Germany | |||||||
Session |
CM3 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
CMB Spectral Distortions: Constraining Inflation At Small Scales | |||||
Coauthors | ||||||||
Abstract |
Anisotropies in the angular power spectra of the CMB temperature and polarization are sourced by inflationary perturbations on scales from 10^1 to 10^4 Mpc. Deviations of the CMB frequency spectrum from a black-body, instead, can probe inflationary perturbations on scales from 10^-4 to 10^-2 Mpc. These length scales are inaccessible to CMB anisotropies and large-scale structure measurements. CMB spectral distortions, averaged over the whole sky, constrain the two-point function of primordial perturbations. Correlation of temperature and spectral distortion anisotropies, instead, can constrain their three-point function (making them a probe of primordial non-Gaussianity). In the first part of this talk I discuss what is the level of sensitivity needed, by an experiment measuring the CMB frequency spectrum, to detect the running of the spectral index of inflationary perturbations. I then discuss what is the minimal contribution to the correlation function between temperature and spectral distortion anisotropies that is expected in standard inflationary scenarios. Finally, I discuss what are the secondary contributions (arising from late-time gravitational evolution) to such angular correlation, and how they could bias constraints on primordial non-Gaussianity. |
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Pdf file |
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