Kavli Affiliate: Craig Hogan
| First 5 Authors: , , , ,
| Summary:
Anisotropy of space-time is measured on the scale of the cosmic horizon,
using the angular correlation function $C(Theta)$ of cosmic microwave
background (CMB) temperature at large angular separation $Theta$. Even-parity
correlation $C_rm even(Theta)$ is introduced to obtain a direct, precise
measure of horizon-scale curvature anisotropy independent of the unknown
dipole, with uncertainty dominated by models of Galactic emission. In maps from
WMAP and Planck, $C_rm even(Theta)$ at $Thetasimeq 90^circpm 15^circ$
is found to be much closer to zero than in previously documented measurements.
Variation from zero as small as that in the sl Planck maps is estimated to
occur by chance in a fraction $simeq 10^-4.3$ to $simeq 10^-2.8$ of
standard realizations. Measurements are found to be consistent with zero
correlation in a range of angles expected from quantum fluctuations during
inflation whose spacelike coherence is bounded by inflationary horizons around
every location at every epoch. This scale-invariant symmetry of cosmological
initial conditions is incompatible with the standard quantum theory of initial
conditions, but is broadly consistent with other cosmological measurements, and
is subject to further tests.
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