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Phase transitions in the early universe can readily create an observablestochastic gravitational wave background. We show that such a backgroundnecessarily contains anisotropies analogous to those of the cosmic microwavebackground (CMB) of photons, and that these too may be within reach of proposedgravitational wave detectors. Correlations within the gravitational waveanisotropies and their cross-correlations with the CMB can provide new insightsinto the mechanism underlying primordial fluctuations, such as multi-fieldinflation, as well as reveal the existence of non-standard ``hidden sectors" ofparticle physics in earlier eras.

Primordial Anisotropies in the Gravitational Wave Background from Cosmological Phase Transitions