17 citations · 39 across the 8 of their papers we have counts for
8 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…
Constraining Gravity Models with The Late-Time Cosmological Evolution
Ishfahani Rusyda, Romy H. S. Budhi
The Modified Gravity is a modification of Einstein's general theory of relativity, which aims to explain issues beyond The Standard Model of Cosmology such as dark energy an…
Inflation due to a non-minimal coupling of singlet scalars in the radiative seesaw model
Romy H. S. Budhi, Shoichi Kashiwase, Daijiro Suematsu
The radiative neutrino mass model with inert doublet dark matter is a promising model for the present experimental issues which cannot be explained within the standard model. We st…
Constrained inflaton due to a complex scalar
Romy H. S. Budhi, Shoichi Kashiwase, Daijiro Suematsu
We reexamine inflation due to a constrained inflaton in the model of a complex scalar. Inflaton evolves along a spiral-like valley of special scalar potential in the scalar field s…
Inflation in a modified radiative seesaw model
Shoichi Kashiwase
A radiative seesaw model with an inert doublet dark matter is a promising candidate which could explain the existence of neutrino masses, dark matter and baryon number asymmetry of…
Inflation in a modified radiative seesaw model
Romy H. S. Budhi, Shoichi Kashiwase, Daijiro Suematsu
The existence of the inflationary era in the early Universe seems to be strongly supported by recent CMB observations. However, only a few realistic inflation scenarios which have…