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A problematic feature of low energy scale inflationary models, such asStarobinsky inflation, in a spatially closed universe is the occurrence of arecollapse and a big crunch singularity before inflation can even set in. In arecent work it was shown that this problem can be successfully resolved in loopquantum cosmology for a large class of initial conditions due to a non-singularcyclic evolution and a hysteresis-like phenomena. However, for certain highlyunfavorable initial conditions the onset of inflation was still difficult toobtain. In this work, we explore the role of dissipative particle production,which is typical in warm inflation scenario, in the above setting. We find thatentropy production sourced by such dissipative effects makes hysteresis-likephenomena stronger. As a result, the onset of inflation is quick in generalincluding for highly unfavorable initial conditions where it fails or issignificantly delayed in the absence of dissipative effects. Wephenomenologically consider three warm inflation scenarios with distinct formsof dissipation coefficient, and from dynamical solutions and phase spaceportraits find that the phase space of favorable initial conditions turns outto be much larger than in cold inflation.

On the role of dissipative effects in the quantum gravitational onset of warm Starobinsky inflation in a closed universe