We study the effect of a nontrivial vacuum prescription on warm inflation observables, namely the power spectrum of the comoving curvature perturbation. Nontrivial choice of vacuum, can provide information about transPlanckian physics. Traditionally, the initial condition for inflation is chosen to be the usual BunchDavies vacuum. Another more reasonable choice of vacuum is the socalled αvacua. Because the duration of inflation is not infinite, as it is assumed in the BunchDavies case, imposing the initial condition at infinite past is not sensible and one must utilize another vacuum prescription. In this paper, working in the slowroll regime during warm inflation, the initial condition for inflaton fluctuations is imposed at finite past, i.e. the αvacua. We show that this nontrivial vacuum prescription results in oscillatory correction to the comoving curvature power spectrum, which is scale dependent both in amplitude and frequency. Having obtained this scale dependent power spectrum, we consider its late time footprints and compare our results with observational data and other proposed models for the comoving curvature power spectrum.
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