120 citations · 310 across the 11 of their papers we have counts for
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Constraints on Resonant Particle Production during Inflation from the Matter and CMB Power Spectra
G. J. Mathews, D. J. H. Chung, K. Ichiki +2
We analyze the limits on resonant particle production during inflation based upon the power spectrum of fluctuations in matter and the cosmic microwave background. We show that suc…
New Classes of Cosmic Energy and Primordial Black-Hole Formation
K. Ichiki, M. Orito, T. Kajino
It has recently been suggested that the formation of horizon-size primordial black hole (PBH) from pre-existing density fluctuations is effective during the cosmic QCD phase transi…
Constraints on Neutrino Degeneracy from the Cosmic Microwave Background and Primordial Nucleosynthesis
M. Orito, T. Kajino, G. J. Mathews +1
We reanalyze the cosmological constraints on the existence of a net universal lepton asymmetry and neutrino degeneracy based upon the latest high resolution CMB sky maps from BOOME…
Observational Constraints on Dark Radiation in Brane Cosmology
K. Ichiki, M. Yahiro, T. Kajino +2
We analyze the observational constraints on brane-world cosmology whereby the universe is described as a three-brane embedded in a five-dimensional anti-de Sitter space. In this br…
Universal Lepton Asymmetry: New Constraints from the Cosmic Microwave Background and Primordial Nucleosynthesis
T. Kajino, M. Orito, G. J. Mathews +1
We study the primordial nucleosynthesis and cosmic age in the presence of a net lepton asymmetry as well as baryon asymmetry. We explore a previously unnoted region of the paramete…
Constraints on Cosmic Quintessence and Quintessential Inflation
M. Yahiro, G. J. Mathews, K. Ichiki +2
Recently, attempts have been made to understand the apparent near coincidence of the present dark energy and matter energy in terms of a dynamical attractor-like solution for the e…
Impact of Few-Body Reactions on Explosive Nucleosynthesis: The Big-Bang and Supernovae
Toshitaka Kajino, Kaori Otsuki, Shin-ya Wanajo +2
We study the few body reactions in explosive nucleosynthesis of light-to-heavy mass elements in various astrophysical conditions. In neutrino-driven winds of gravitational core col…
Neutrino Degeneracy and Decoupling: New Limits from Primordial Nucleosynthesis and the Cosmic Microwave Background
M. Orito, T. Kajino, G. J. Mathews +1
We reanalyze the cosmological constraints on the existence of a net universal lepton asymmetry and neutrino degeneracy. We show that neutrinos can begin to decouple at higher tempe…
Neutrinos and Big-Bang Nucleosynthesis
T. KAJINO, M. ORITO
Observations of clusters and super clusters of galaxies have indicated that the Universe is more dominated by baryons than ever estimated in the homogeneous cosmological model for…
Geometrical Effects of Baryon Density Inhomogeneities on Primordial Nucleosynthesis
M. Orito, T. Kajino, R N. Boyd +1
We discuss effects of fluctuation geometry on primordial nucleosynthesis. For the first time we consider condensed cylinder and cylindrical-shell fluctuation geometries in addition…