Viability of warm inflation with standard model interactions
Rudnei O. Ramos, Gabriel S. Rodrigues
Abstract
The minimal warm inflation scenario proposed in [K. V. Berghaus , Warm inflation with the standard model, .]—featuring an axionlike inflaton coupled to Standard Model (SM) gluons via the standard interaction <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mi>ϕ</a:mi> <a:mi>G</a:mi> <a:mover accent="true"> <a:mi>G</a:mi> <a:mo stretchy="false">˜</a:mo> </a:mover> </a:math> —offers a compelling bridge between inflationary dynamics and SM particle content. While the model retains only the inflaton as a beyond-SM field, its original analysis relied on some approximate treatments of warm inflation’s (WI) dynamics. Here, we revisit this scenario using 2easy, a precision computational tool for WI dynamics [G. S. Rodrigues and R. O. Ramos, 2easy: Warm inflation dynamics made easy, .], to rigorously evaluate the model’s viability and full range of model’s parameters compatible with the observational parameters. Overall, we find that the results of Berhaus hold, but with significant differences in the weak and strong dissipative regimes of WI.