The baryon acoustic oscillation (BAO) peak, seen in the cosmic matter distribution at redshifts up to ∼3.5, reflects the continued expansion of the sonic horizon first identified in temperature anisotropies of the cosmic microwave background. The BAO peak position can now be measured to better than ∼1% accuracy using galaxies and ∼1.4-1.6%

Context. The existence of a maximum correlation angle (θ max ≳ 60°) in the two-point angular temperature correlations of cosmic microwave background (CMB) radiation, measured by WMAP and Planck, stands in sharp contrast to the prediction of standard inflationary cosmology, in which the correlations should extend across the full sky (i.e., 180°)

Desde su descubrimiento en 1912 por Victor Hess, los rayos cósmicos han proporcionado información clave sobre el origen, aceleración y propagación de partículas a través de nuestra galaxia. Los experimentos de rayos cósmicos han proporcionado información importante para la física de partículas. En física solar, los rayos cósmicos contribuyen a la