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117 papers
The -mode frequencies in cold neutron stars and nuclear saturation parameters
Hajime Sotani, Hajime Togashi
Oscillation frequencies excited in neutron stars are crucial for extracting their interior properties. In addition to the fundamental and pressure modes, the gravity (-) modes c…
Universality of dual mass-scaled fundamental modes in two-fluid neutron stars with mirror dark matter
Hajime Sotani, Ankit Kumar
Universal relations provide a particularly useful way to extract physical information from neutron star observables in the presence of various uncertainties by reducing the depende…
Non-radial pulsations of gravitationally coupled two-fluid neutron stars in general relativity
Ankit Kumar, Daniel A. Caballero, Hajime Sotani +1
Non-radial oscillations of neutron stars provide a powerful probe of stellar structure and relativistic gravity, but a fully general relativistic treatment for gravitationally coup…
Understanding supernova gravitational waves with protoneutron star asteroseismology
Hajime Sotani
Supernovae are one of the most promising gravitational wave sources. But, since the system of the supernovae is nearly spherically symmetric, the expected gravitational waves from…
Estimation of neutron star mass and radius of FRB 20240114A by identification of crustal oscillations
Hajime Sotani, Zorawar Wadiasingh, Cecilia Chirenti
By identifying quasi-periodic oscillations (QPOs) reported in FRB 20240114A (from the Five-hundred-meter Aperture Spherical Telescope) with neutron star crustal torsional oscillati…
Slowly Rotating Two-Fluid Neutron Stars: Coupled Frame-Dragging, Inertia Splitting, and Universal Relations
Ankit Kumar, Hajime Sotani
We develop a fully relativistic framework to study the rotational response of gravitationally coupled two-fluid neutron stars within the slow-rotation approximation. Treating the t…