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49 papers · 1 filter
Observation of PeV Gamma Rays from the Monogem Ring with the Tibet Air Shower Array
The Tibet AS Gamma Collaboration, M. Amenomori
We searched for steady PeV gamma-ray emission from the Monogem ring region with the Tibet air shower array from 1997 February to 2004 October. No evidence for statistically signifi…
Dark Energy Evolution and the Curvature of the Universe from Recent Observations
Kazuhide Ichikawa, Tomo Takahashi
We discuss the constraints on the time-varying equation of state for dark energy and the curvature of the universe using observations of type Ia supernovae from Riess et al. and th…
A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey IV: Discovery of Seven Additional Quasars
Xiaohui Fan, Michael A. Strauss, Gordon T. Richards +27
We present the discovery of seven quasars at z>5.7, selected from ~2000 deg^2 of multicolor imaging data of the Sloan Digital Sky Survey (SDSS). The new quasars have redshifts z fr…
Unification of Dark Energy and Dark Matter
Fuminobu Takahashi, T. T. Yanagida
We propose a scenario in which dark energy and dark matter are described in a unified manner. The ultralight pseudo-Nambu-Goldstone (pNG) boson, A, naturally explains the observed…
Are protons still dominant at the knee of the cosmic-ray energy spectrum?
The Tibet AS Gamma Collaboration, M. Amenomori
A hybrid experiment consisting of emulsion chambers, burst detectors and the Tibet II air-shower array was carried out at Yangbajing (4,300 m a.s.l., 606 g/cm) in Tibet to obta…
Massive Neutrinos in Cosmology
Masataka Fukugita
The roles of massive neutrinos in cosmology -- in leptogenesis and in the evolution of mass density fluctuations -- are reviewed. Emphasis is given to the limit on neutrino mass fr…