2025/06/14 by Bahari, Karam, Heydari, Soma, Karami, Kayoomars · 1 citation
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th)
paper · doi:10.48550/arxiv.2506.12392
Here, a natural non-canonical inflationary model based on a power-law Lagrangian is investigated. We analyze the scalar spectral index n\rm s and the tensor-to-scalar ratio r of the model and identify their degeneracies with respect to the free parameters. Notably, n\rm s and r are independent of the model parameters that leads to unresolved degeneracies. Employing the constraints on reheating parameters such as the reheating duration N_\rmreh, the reheating temperature T_\rmreh, and the equation of state parameter ω_\rmreh, is found to be insufficient to fully break these degeneracies. However, the relic gravitational wave spectrum provides a way to break degeneracy with respect to the non-canonical parameter α, degeneracy with respect to the potential parameter f persist. Finally, we specify the allowed ranges for the inflationary duration N and the parameter α, in light of the latest observational data. These results highlight the role of relic gravitational waves in refining inflationary models and illustrate the challenges in fully resolving parameter degeneracies.