Revisiting CMB constraints on Warm Inflation

Understand

We revisit the constraints that Planck 2015 temperature, polarization and lensing data impose on the parameters of warm inflation.

• To this end, we study warm inflation driven by a single scalar field with a quartic self interaction potential in the weak dissipative regime.
• We analyse the effect of the parameters of warm inflation, namely, the inflaton self coupling $\lambda$ and the inflaton dissipation parameter $Q_P$ on the CMB angular power spectrum.
• We constrain $\lambda$ and $Q_P$ for 50 and 60 number of e-foldings with the full Planck 2015 data (TT, TE, EE + lowP and lensing) by performing a Markov-Chain Monte Carlo analysis using the publicly available code {\tt CosmoMC} and obtain the joint as well as marginalized distributions of those parameters.