Day 797

Tuesday.

1412.0178
An observational signal of the void shape correlation and its link to the cosmic web
Lee, Hoyle

The shapes of cosmic voids are prone to distortions by the external tidal forces since their low-densities imply a lower internal resistance.  This susceptibility of the void shapes to the tidal distortions makes them useful as an indicator of the large-scale tidal and density fields, despite the practical difficulty in defining them.  Using the void catalog by Pan+2012 from SDSS DR7, detect a clear 4 sigma signal of spatial correlations of the void shapes on the scale of 20 Mpc/h and show that the signal is robust against the projection of the void shapes onto the plane of sky.  By constructing a simple analytic model for the void shape correlation, within the framework of tidal torque theory, demonstrate that the void shape correlation function scales linearly with the 2PCF of the linear density field.  Also find a direct observational evidence for the cross-correlation of the void shapes wit the large-scale velocity shear field that was linearly reconstructed by Lee+2014 from DR7.  Discuss the possibility of using the void shape correlation function to break the degeneracy between the density parameter and the power spectrum amplitude and to independently constrain the neutrino mass as well.
1412.0592
Constraints on massive neutrinos from the pairwise kinematic Sunyaev-Zel'dovich effect
Mueller, de Bernardis, Bean, Niemack

Central to the constraints is a distinctive scale dependence of the kSZ neutrino signature on the mean pairwise momentum of clusters that is not expected to be mirrored in systematic effects that change the overall amplitude of the signal, like the cluster optical depth.  Forecasts.

1412.0626
The Atacama Cosmology Telescope: lensing of CMB temperature and polarization derived from Cosmic Infrared Background Cross-Correlation
ven Engelen, Sherwin, Sehgal, ... et al

Present a measurement of the gravitational lensing of CMB temperature and polarizattion fields obtained by cross-correlating the reconstructed convergence signal from the first season of ACTPol data, with CIB fluctuations measured using the Planck satellite.  Using an overlap area of 206 sq deg, detect gravitational lensing of the CMB polarization by large-scale structure at a statistical significance of 4.5 sigma.  Combining both CMB temperature and polarization data gives a lensing detection at 9.1 sigma significance.  A B-mode polarization lensing signal is present with a significance of 3.2 sigma.  Also present the first measurement of CMB lensing-CIB correlation at small scales corresponding to ell > 2000.  Null tests and systematic checks show that the results are not significantly biased by astrophysical or instrumental systematic effects, including Galactic dust.  Fitting measurements to the best-fit lensing-CIB cross PS measured in Planck data, scaled by an amplitude A, gives A = 1.02pm0.02, consistent with the Planck results.