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8 papers · 1 filter
Weighing matrices and spherical codes
Hiroshi Nozaki, Sho Suda
Mutually unbiased weighing matrices (MUWM) are closely related to an antipodal spherical code with 4 angles. In the present paper, we clarify the relationship between MUWM and the…
A New Cluster of Galaxies towards the Galactic Bulge, Suzaku J1759-3450
Hideyuki Mori, Yoshitomo Maeda, Akihiro Furuzawa +2
We observed an extended X-ray source designated as Suzaku J1759-3450 with the Suzaku and Chandra observations towards 1RXS J175911.0-344921, which is an unidentified X-ray source l…
Polynomial properties on large symmetric association schemes
Hiroshi Nozaki
In this paper we characterize "large" regular graphs using certain entries in the projection matrices onto the eigenspaces of the graph. As a corollary of this result, we show that…
A cross-intersection theorem for vector spaces based on semidefinite programming
Sho Suda, Hajime Tanaka
Let and be families of - and -dimensional subspaces, respectively, of a given -dimensional vector space over a finite field .…
On relative -designs in polynomial association schemes
Eiichi Bannai, Etsuko Bannai, Sho Suda +1
Motivated by the similarities between the theory of spherical -designs and that of -designs in -polynomial association schemes, we study two versions of relative -desig…
Search for oscillations with the OPERA experiment in the CNGS beam
OPERA collaboration, N. Agafonova, A. Aleksandrov +161
A first result of the search for \numu \nue oscillations in the OPERA experiment, located at the Gran Sasso Underground Laboratory, is presented. The experiment looke…