Abstract
The dipole anisotropy of the cosmic microwave background (CMB) is usually attributed to the motion of the solar system relative to the CMB. However, such an interpretation requires that the Planck distribution P(ω, T) be non-Lorentz invariant. We discuss an alternative interpretation called the 'Big Jets' model, based on a Lorentz-invariant blackbody distribution B(kλUλ/Tinv), which reduces to the Planck distribution in the non-relativistic limit. This model, which implies that the CMB anisotropy must originate from a real, physical anisotropy of the universe, can be tested by examining the shape of the invariant blackbody distribution B(kλUλ/Tinv) and the dipole spectrum as measured by the COBE, WMAP, and Planck satellite experiments. The Big Jets model (a) provides a way to restore matter-antimatter symmetry in the universe by proposing that instead of a big bang, the universe began with two big jets, one with more matter and one with more anti-matter, and (b) suggests that it is the remnant of the anti-matter jet, detectable only as an extremely distant blackbody, that produces the observed CMB dipole anisotropy.