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35 papers · 1 filter
Log-uniruled affine varieties without cylinder-like open subsets
Adrien Dubouloz, Takashi Kishimoto
A classical result of Miyanishi-Sugie and Keel-McKernan asserts that for smooth affine surfaces, affine-uniruledness is equivalent to affine-ruledness, both properties being in fac…
Topological Phases of the Spin-1/2 Ferromagnetic-Antiferromagnetic Alternating Heisenberg Chain with Frustrated Next-Nearest-Neighbour Interaction
Kazuo Hida, Ken'ichi Takano, Hidenori Suzuki
The spin-1/2 ferromagnetic-antiferromagnetic alternating Heisenberg chain with ferromagnetic next-nearest-neighbour (NNN) interaction is investigated. The ground state is the Halda…
Ga-actions on affine cones
Takashi Kishimoto, Yuri Prokhorov, Mikhail Zaidenberg
We give a criterion of existence of a unipotent group action on the affine cone over a projective variety or, more generally, on the affine quasicone over a variety which is projec…
Systematic decomposition of the neutrinoless double beta decay operator
Florian Bonnet, Martin Hirsch, Toshihiko Ota +1
We discuss the systematic decomposition of the dimension nine neutrinoless double beta decay operator, focusing on mechanisms with potentially small contributions to neutrino mass,…
Observation of new microsecond isomers among fission products of 345 MeV/nucleon 238U
D. Kameda, T. Kubo, T. Ohnishi +56
A search for isomeric gamma-decays among fission fragments from 345 MeV/nucleon 238U has been performed at the RIKEN Nishina Center RI Beam Factory. Fission fragments were selected…
The ASTRO-H X-ray Observatory
Tadayuki Takahashi, Kazuhisa Mitsuda, Richard Kelley +220
The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions initiated by the Institute of Space and Astronautical Science (ISAS). ASTRO-H will…