References 261several distinctive signatures in the microwave background radiation. Current
measurements beautifully confirm a flat universe and are fully consistent with
Gaussian perturbations; the rest of the tests will come into clearer view over
the coming years. If inflation actually occurred, we can expect to have very
strong circumstantial supporting evidence from the above signatures, along with
precision measurements of the cosmological parameters describing our universe.
However, if inflation did not occur, the universe will likely look different in some
respects from the space of models in section 7.5.1. In this case, we may not be able
to recover cosmological parameters as precisely, but the microwave background
will be equally important in discovering the correct model of our universe.
Acknowledgments
I thank the organizers for a stimulating and enjoyable Summer School. The
preparation of this chapter has been supported by a grant from NASA and through
the Cotrell Scholars Program of the Research Corporation.
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