Abstract
In Chap. 7, we have demonstrated that the \(B\)–\(L\) phase transition, in combination with the subsequent reheating process, is indeed capable of generating the initial conditions for the hot early universe. In the context of the supersymmetric Abelian Higgs model, which we discussed in Chap. 5, and with \(B\)–\(L\) breaking taking place at the GUT scale, an initial phase of unbroken \(B\)–\(L\) yields hybrid inflation, ending in tachyonic preheating in the course of which \(B\)–\(L\) is spontaneously broken. If the gravitino is the LSP, the entropy of the thermal bath, the baryon asymmetry as well as gravitino dark matter are successfully produced during reheating.
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