= Andrew R. Liddle
{c}
{tag=Physicist}
{wiki}
<Andrew R. Liddle> coauthored an analysis of when observable perturbations were produced relative to the end of <cosmic inflation>. It shows why a single universal count of expansion factors is not an assumption-free link between an inflationary model and present observations.<How long before the end of inflation were observable perturbations produced? by Andrew R. Liddle and Samuel M. Leach>[Abstract: standard and nonstandard expansion histories]{ref}
The duration and physical conditions after inflation enter the mapping between an observed <wavelength> and the earlier field evolution. This gives <reheating> a role in testing a model even when the <reheating> process is not directly observed.
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