14 papers
Effects of Differential Rotation on the Maximum Mass of Neutron Stars
Hyukjin Kwon, Jinho Kim, Kazuyuki Sekizawa
The maximum mass of neutron stars provides a key constraint on the equation of state (EoS) of dense matter. Recent observations, including the pulsar PSR~J07…
Accuracy and Applicability of the Hartle-Thorne and Komatsu-Eriguchi-Hachisu Methods for Modeling Rotating Neutron Stars
Hyukjin Kwon, Kenta Yoshimura, Tsuyoshi Miyatsu +2
Neutron stars, which are composed of extremely dense nuclear matter, serve as natural laboratories to study nuclear interactions beyond the terrestrial experiments. Recent research…
Fully general relativistic description of rapidly-rotating axially-symmetric neutron stars for constraining nuclear matter equations of state
Hyukjin Kwon, Kazuyuki Sekizawa
Background: Constraining the nuclear matter equation of state (EoS) from neutron star observations is one of the main subjects in nuclear physics today. In general, neutron stars r…
Three-dimensional orbital-free density functional theory description of nuclear pasta in the inner crust of neutron stars
Yo Nakamura, Kazuyuki Sekizawa
Background: In the bottom layer of the inner crust of neutron stars, various crystalline structures are expected to emerge that are collectively called ``nuclear pasta.'' It is des…
Impact of hyperon mixing on neutron star structure based on Skyrme-type equations of state: Systematic analysis of and three-body forces with Bayesisan inference
Taeho Lee, Yoonhak Nam, Kazuyuki Sekizawa
We study hyperonic density-dependent three-body effects in cold neutron-star matter using a Skyrme energy-density-functional framework. In beta-equilibrated matter, the e…
Formation of bound composite vortices of a singly-quantized S vortex and half-quantized P vortices in the S-P coexisting phase in neutron stars
Tatsuhiro Hattori, Muneto Nitta, Kazuyuki Sekizawa
Pulsar glitches are believed to originate from the dynamics of quantized vortices in the neutron superfluid interior. The outer core of a neutron star hosts a spin-t…