More hilltop inflation models

Kazunori Kohri, Chia-Min Lin, David H Lyth
2007 Journal of Cosmology and Astroparticle Physics  
Using analytic expressions, we explore the parameter space for hilltop inflation models with a potential of the form V_0± m^2ϕ^2 -aϕ^p. With the positive sign and p>2 this converts the original hybrid inflation model into a hilltop model, allowing the spectral index to agree with the observed value n=0.95. In some cases the observed value is theoretically favored, while in others there is only the generic prediction |n-1| 1.
doi:10.1088/1475-7516/2007/12/004 fatcat:v3uzqo44yfe3dm7qdt3zhwbcvi