Abstract
We relate the mechanism of matter creation in the universe after inflation to a simple and universal mathematical property of extended N > 1 supergravities and related compactifications of superstring theory. We show that in all such models, the inflaton field may decay into vector fields due to a nonminimal scalar-vector coupling. This coupling is compulsory for all scalars except N = 2 hyperscalars. The proof is based on the fact that all extended supergravities described by symmetric coset spaces \( \frac{G}{H} \) have duality groups G of type E7, with exception of U(p, n) models. For N = 2 we prove separately that special geometry requires a non-minimal scalar-vector coupling. Upon truncation to N = 1 supergravity, extended models generically preserve the non-minimal scalar-vector coupling, with exception of U(p, n) models and hyperscalars. For some string theory/supergravity inflationary models, this coupling provides the only way to complete the process of creation of matter in the early universe.
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Ferrara, S., Kallosh, R. Creation of matter in the universe and groups of type E7. J. High Energ. Phys. 2011, 96 (2011). https://doi.org/10.1007/JHEP12(2011)096
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DOI: https://doi.org/10.1007/JHEP12(2011)096