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The Intrinsic Bispectrum of the Cosmic Microwave Background
In 1927, the American astronomer Edwin Hubble showed the Universe is expanding: distant galaxies are receding from each other. This confirmed the so-called Standard Model of Cosmology, that the universe, on the largest scale, is evolving according to a Friedman-Robertson-Walker spacetime. The starting assumption in this model is the Cosmological Principlethat on the largest scale, we are not in a special place in the universe-that the universe is homogeneous and isotropic about every point likedoi:10.1007/978-3-319-21882-3_2 fatcat:lrqfs5nz3fekjgwtxw7por6mt4