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The Minimum Mass of the First Stars and the Anthropic Principle
Takashi Nakamura, Hideya Uehara, Takeshi Chiba
The lower limit of the mass of the first stars suggested recently may imply the formation of massive stars of mass greater than 8 solar mass irrespective of the details of the init…
Scalar gravitational wave from Oppenheimer-Snyder collapse in scalar- tensor theories of gravity
Tomohiro Harada, Takeshi Chiba, Ken-ichi Nakao +1
Unlike general relativity, scalar-tensor theories of gravity predict scalar gravitational waves even from a spherically symmetric gravitational collapse. We solve numerically the g…
Fragmentation of the Primordial Gas Clouds and the Lower Limit on the Mass of the First Stars
Hideya Uehara, Hajime Susa, Ryoichi Nishi +2
We discuss the fragmentation of primordial gas clouds in the universe after decoupling. Comparing the time scale of collapse with that of fragmentation, we obtain the typical mass…
Exotic Properties of Light Nuclei and their Neutron Capture Cross Sections
A. Mengoni, T. Otsuka, T. Nakamura +1
We have investigated the implications of the neutron halo configuration, observed in the ground-state of some neutron-rich light nuclei, on neutron radiative transition processes.…