Wigner rotation
= Wigner rotation
{c}
Two noncollinear <Lorentz boosts> produce a <Lorentz transformation> with both a boost and a rotation. In the <SL(2,C)> lift, the product of two positive Hermitian boost <matrices> generally ceases to be Hermitian. Its <polar decomposition of an invertible complex matrix> separates a positive Hermitian boost factor and a unitary rotation factor. The rotation depends on both boosts and their order, and is called the Wigner rotation.