14 citations · 54 across the 7 of their papers we have counts for
11 papers
Magnetically confined mountains on accreting neutron stars with multipole magnetic fields
Kotaro Fujisawa, Shota Kisaka, Yasufumi Kojima
Magnetically confined mountains on accreting neutron stars are candidates for producing continuous gravitational waves. We formulate a magnetically confined mountain on a neutron s…
A novel formulation for the evolution of relativistic rotating stars
Hirotada Okawa, Kotaro Fujisawa, Nobutoshi Yasutake +3
We present a new formulation to construct numerically equilibrium configurations of rotating stars in general relativity. Having in mind the application to their quasi static evolu…
Singularity-Avoiding Multi-Dimensional Root-Finder
Hirotada Okawa, Kotaro Fujisawa, Yu Yamamoto +3
We proposed in this paper a new method, which we named the W4 method, to solve nonlinear equation systems. It may be regarded as an extension of the Newton-Raphson~(NR) method to b…
Magnetic field sustained by the elastic force in neutron star crusts
Yasufumi Kojima, Shota Kisaka, Kotaro Fujisawa
We investigate the magneto--elastic equilibrium of a neutron star crust and magnetic energy stored by the elastic force. The solenoidal motion driven by the Lorentz force can be co…
Magneto-elastic equilibrium of a neutron-star crust
Yasufumi Kojima, Shota Kisaka, Kotaro Fujisawa
We examine the equilibrium of a magnetized neutron-star-crust. We calculate axially symmetric models in which an elastic force balances solenoidal motion driven by a Lorentz force.…
Evolution of magnetic deformation in neutron star crust
Yasufumi Kojima, Shota Kisaka, Kotaro Fujisawa
In this study, we examine the magnetic field evolution occurring in a neutron star crust. Beyond the elastic limit, the lattice ions are assumed to act as a plastic flow. The Ohmic…