Abstract
In spite of its great phenomenological success, current models of scalar field-driven inflation suffer from important unresolved conceptual issues. New fundamental physics will be required to address these questions. String theory is a candidate for a unified quantum theory of all four forces of nature. As will be shown, string theory may lead to a cosmological background quite different from an inflationary cosmology, and may admit a new stringy mechanism for the origin of a roughly scale-invariant spectrum of cosmological fluctuations.
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Brandenberger, R.H. (2008). Conceptual Problems of Inflationary Cosmology and a New Approach to Cosmological Structure Formation. In: Lemoine, M., Martin, J., Peter, P. (eds) Inflationary Cosmology. Lecture Notes in Physics, vol 738. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-74353-8_11
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