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Running the running | | Giovanni Cabass
; Eleonora Di Valentino
; Alessandro Melchiorri
; Enrico Pajer
; Joseph Silk
; | | Date: |
1 May 2016 | | Abstract: | We use the recent observations of Cosmic Microwave Background temperature and
polarization anisotropies provided by the Planck satellite experiment to place
constraints on the running $alpha_mathrm{s} = mathrm{d}n_{mathrm{s}} /
mathrm{d}log k$ and the running of the running $eta_{mathrm{s}} =
mathrm{d}alpha_{mathrm{s}} / mathrm{d}log k$ of the spectral index
$n_{mathrm{s}}$ of primordial scalar fluctuations. We find
$alpha_mathrm{s}=0.011pm0.010$ and $eta_mathrm{s}=0.027pm0.013$ at
$68\%,mathrm{CL}$, suggesting the presence of a running of the running at the
level of two standard deviations. We find no significant correlation between
$eta_{mathrm{s}}$ and foregrounds parameters, with the exception of the
point sources amplitude at $143,mathrm{GHz}$, $A^{PS}_{143}$, which shifts by
half sigma when the running of the running is considered. We further study the
cosmological implications of this anomaly by including in the analysis the
lensing amplitude $A_L$, the curvature parameter $Omega_k$, and the sum of
neutrino masses $sum m_{
u}$. We find that when the running of the running is
considered, Planck data are more compatible with the standard expectations of
$A_L = 1$ and $Omega_k = 0$ but still hint at possible deviations. The
indication for $eta_mathrm{s} > 0$ survives at two standard deviations when
external datasets such as BAO and CFHTLenS are included in the analysis, and
persists at $sim 1.7$ standard deviations when CMB lensing is considered. We
discuss the possibility of constraining $eta_mathrm{s}$ with current and
future measurements of CMB spectral distortions, showing that an experiment
like PIXIE could provide strong constraints on $alpha_mathrm{s}$ and
$eta_mathrm{s}$. | | Source: | arXiv, 1605.0209 | | Services: | Forum | Review | PDF | Favorites | |
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