6 papers
Higher-Order Analytical Expansion of Thawing Dark Energy with an Exponential Potential
Naoto Maki, Kazunori Kohri
Motivated by recent DESI results suggesting dynamical dark energy, we investigate the thawing scenario in quintessence with an exponential potential, …
Natural Inflation with a negative cosmological constant
Chia-Min Lin, Naoto Maki, Kazunori Kohri
In this work, we investigate a cosmic inflation model based on a cosine-type potential with a negative cosmological constant. This model originates from a classical solution of the…
Exponential Quintessence Model: Analytical Quantification of the Fine-Tuning Problem in Dark Energy
Naoto Maki, Kazunori Kohri
In this paper, we investigate a quintessence field with an exponential potential motivated by the suggestion of time-varying dark energy from the DESI galaxy survey. Assuming a kin…
Exponential Quintessence: Analytic Relationship Between the Current Equation of State Parameter and the Potential Parameter
Naoto Maki, Kazunori Kohri
Motivated by the indications of time-varying dark energy equation of state reported from DESI, we investigate a quintessence model with an exponential potential $V_0 e^{-λÏ/m_{\m…
Simple Analytical Solutions of the Wheeler-DeWitt Equation in the Classical Hamilton-Jacobi Limit
Naoto Maki, Chia-Min Lin, Kazunori Kohri
We investigate the Wheeler-DeWitt equation for a flat, homogeneous, and isotropic Universe containing a canonical scalar field with a potential. We show that under the constraint $…
Creation of Viscous Dark Energy by the Hubble Flow: Comparison with SNe Ia Master Sample Binned Data
Iolanda Navone, Maria Giovanna Dainotti, Elisa Fazzari +3
We study a family of cosmological models featuring dynamical dark energy (DE), based on the idea that the creation of its constituents arises from the gravitational field of the ex…