On monopoles, dipoles and quadrupoles

by Douglas Scott

Aula Conversi (Dipartimento di Fisica - Ed. G. Marconi)

Aula Conversi

Dipartimento di Fisica - Ed. G. Marconi

Anisotropies in the Cosmic Microwave Background are now routinely measured with high precision out to multipoles of several thousand. However, I'd like here to talk about the lowest multipoles, specifically the monopole, dipole and quadrupole. These are special for several reasons, and there are new ways to think about them, as I'll try to convince you!