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Inflationary Epoch

A period of extremely rapid exponential expansion in the very early universe, driven by a scalar field.
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The statement of the theorem

The inflationary epoch is characterized by a period of quasi-de Sitter expansion, where the scale factor a(t)a(t) grows exponentially with time tt. This rapid expansion is modeled by the condition a¨>0\ddot{a} > 0 and the slow-roll approximation, leading to:\na(t)∝eHinfta(t) \propto e^{H_{inf} t}