11 citations · 13 across the 5 of their papers we have counts for
5 papers
Minimal Extensions of the -Starobinsky Model: Reconciling ACT DR6 and Reheating Constraints
Nehla Shobcha, Norma Sidik Risdianto, Romy Hanang Setya Budhi
The latest combined data from the Atacama Cosmology Telescope (ACT) DR6, Planck, and DESI yields a scalar spectral index , which lies approximately ab…
Preventing Curvature Singularities in Dark Energy Models
Romy Hanang Setya Budhi, Nehla Shobcha, Norma Sidik Risdianto
The curvature singularity problem in dark energy models poses a significant challenge to their viability as alternatives to the CDM paradigm. In this work, we investigate…
The Preheating Stage on The Starobinsky Inflation after ACT
Norma Sidik Risdianto, Romy Hanang Setya Budhi, Nehla Shobcha +2
Recent ACT results favor larger e-fold numbers, which tighten the reheating requirements in Starobinsky inflation. We show that efficient reheating generically requires an addition…
The Second-Level Preheating
Norma Sidik Risdianto, Apriadi Salim Adam, Lalu Zamakhsyari
This paper proposes two levels of preheating for the inflaton that is non-minimally coupled with gravity. The first level, later named by the quadratic regime, corresponds to the m…
Inflation connected to the origin of violation
Tsuyoshi Hashimoto, Norma Sidik Risdianto, Daijiro Suematsu
We consider a simple extension of the standard model, which could give a solution for its issues such as the origin of both CKM and PMNS phases and the strong problem. Th…