Hints for dynamical dark energy from warm inflation

Abstract: The effect of dissipation from the thermal bath of minimal warm inflation (MWI) on the temperature anisotropies of the cosmic microwave background (CMB) is investigated. A shift in the phase and peaks of the theoretical TT mode angular power spectrum of CMB for MWI with increasing dissipation strength hints at the dynamical nature of dark energy from warm inflation. Outcome of the study highlights the necessity of modifying the cosmological parameters, signalling a physics beyond the standard $\Lambda$CDM model of cosmology. The current findings may open a new direction for explaining the increased expansion rate in the early universe, thus alleviating some of the persistent tensions in cosmology, especially the Hubble tension.