Masahiro Kasuya

Topology of zero riemann curvature flat space in supergravity

Abstract The equation of motion of the gravitino is investigated in a flat space reduced from the Kerr geometry by taking the massless limit of the gravitational source. We adopt the ansatz ψ μ ( x )= δ μo ψ ( x ), i.e., the Coulomb potential analogue to the Rarita-Schwinger Majorana field of the gravitino. A non-trivial exact classical solution of ψ ( x ) is obtained and it is interpreted as the source of the intrinsic topology of the background flat space. This flat space is spanned by two Minkowski sheets interconnected through a disk of radius a (the angular momentum parameter in the Kerr geometry).

An exact rotating Schwinger dyon solution with the Kerr-Newman metric

Abstract We present an exact rotating Schwinger dyon solution with the Kerr-Newman metric which is characterized by four physical parameters, mass M , angular momentum S , electric charge Q , and magnetic charge φ. Our solution reduces to the rotating Dirac monopole in the case Q = 0.

An exact dyon solution with the Reissner-Nordström metric

SummaryThe spherically symmetric Julia-Zee dyon solution of the coupled Yang-Mills-Higgs systems is studied in curved space-time. An exact solution for which the space-time metric takes the Reissner-Nordström form is presented.RiassuntoSi studia nello spazio-tempo curvo la soluzione a simmetria sferica del dione di Julia-Zee del sistema accoppiato di Yang-Mills-Higgs. Si presenta una soluzione esatta per la quale la metrica dello spazio-tempo prende la forma di Reissner-Nordström.

Gravitating Julia-Zee dyon and the cosmological term

The relation between the spherically symmetric Julia-Zee dyon of the coupled Yang-Mills-Higgs system and the cosmological term is studied in curved space-time. It is pointed out that the cosmological term comes out of the Higgs field.

Comparative study on spherical tessellation schemes for global GIS

Abstract Global environmental problems have attracted increasingly public attention in recent years. The GIS for managing and handling global environmental information (Global GIS) is expected to be a useful tool in global environmental studies. A tessellation scheme of a spherical surface of the globe forms one of the important basis of a Global GIS especially in using raster data. However, conventional latitude‐longitude tessellation scheme has several inconveniences, such as low efficiency in data storage and analysis. After reviewing requirements of spherical tessellation schemes for Global GIS, we propose a set of evaluation indices and make a comprehensive comparison of spherical tessellation schemes, including conventional and proposed ones. Through the comparison, North‐Up ZOT projection‐based tessellation proposed by the authors is found relatively suitable for Global GIS, especially in applying existing GIS software.

An exact rotating dyon solution with the Tomimatsu-Sato metric

Abstract We present an exact rotating dyon solution for which the space-time metric takes the Tomimatsu-Sato form with an arbitrary integer distortion parameter δ. Our solution reduces to the rotating monopole solution for vanishing electric charge.

Dyon black hole and its mass formula in the Tomimatsu-Sato-Yamazaki space-time

It is shown that a dyon solution, characterized by five parameters (massM, angular momentumJ, electric chargeQ, magnetic charge Φ, and distortion parameter δ), has an event horizon for arbitrary odd integer δ and satisfies the Christodoulou-Ruffini mass formula.

DYON BLACK HOLE AND THERMODYNAMICS IN THE TOMIMATSU-SATO-YAMAZAKI SPACE-TIME

Abstract The space-time structure of an exact dyon solution with the Tomimatsu-Sato-Yamazaki metric (ergosurfaces, event horizons, and ring singularities) is studied, and the relation between dyon black hole and thermodynamics is discussed.

An exact dyon solution in the Tomimatsu-Sato-Yamazaki space-time

SummaryWe present an exact solution of a rotating dyon in the Tomimatsu-Sato-Yamazaki space-time. This solution is characterized by five parameters (massM, angular momentumS, electric chargeQ, magnetic charge Φ and distortion parameter δ), has the event horizon for odd integer δ and reduces to the rotating monopole in the caseQ=0.RiassuntoSi presenta una soluzione esatta di un dione rotante nello spazio-tempo di Tomimatsu-Sato-Yamazaki. Questa soluzione è caratterizzata da cinque parametri (massaM, impulso angolareS, carica elettricaQ, carica magnetica Φ e parametro di distorsione δ), ha l’evento orizzonte per numeri dispari δ e si riduce al monopolo rotante nel casoQ=0.РезюмеМы предлагаем точное решение для вращающегося диона в пространстве-времени Томиматцу-Сато-Ямадзаки. Это решение характеризуется пятью параметрами (массаM, моментS, электрический зарядQ, магнитный заряд Φ и параметр дисторсии δ), имеет горизонт событий для нечетных δ и сводится к вращающемуся монополю в случаеQ=0.