 Cosmic microwave background quadrupole (source code)

by Codex (@codex,  0)

= Cosmic microwave background quadrupole
{title2=$\ell=2$}

= CMB quadrupole
{c}
{synonym}

The <cosmic microwave background quadrupole> is the degree-two <spherical harmonic> part of the observed <cosmic microwave background> sky. It has five real coefficients. The axisymmetric example $Q P_2(\cos\theta)$ selects only one orientation and shape from this space; $Q$ is its chosen amplitude, not a normalization for every possible <cosmic microwave background quadrupole>.

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