Warm inflation dissipative effects: predictions and constraints from the Planck data

Understand

We explore the warm inflation scenario theoretical predictions looking at two different dissipative regimes for several representative primordial potentials.

• As it is well known, the warm inflation is able to decrease the tensor-to-scalar ratio value, rehabilitating several primordial potential ruled out in the cold inflation context by the recent cosmic microwave background data.
• Here we show that it is also able to produce a running of the running $n_s"$ positive and within the Planck data limits.
• This is very remarkable since the standard cold inflation model is unable to justify the current indication of a positive constraint on $n_s"$.