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41 papers · 1 filter
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…
Cosmic ray mass composition measurement in the energy range from eV to eV observed with the TALE hybrid detector
Telescope Array Collaboration, R. U. Abbasi, T. Abu-Zayyad +126
We report on the cosmic ray mass composition measured by the Telescope Array Low-energy Extension (TALE) hybrid detector. The TALE detector consists of a fluorescence detector (FD)…
Universal relations between the quasinormal modes of neutron stars and magnetic tidal deformability
Hajime Sotani
Tidal deformabilities are one of the observable quantities characterizing neutron stars, which are strongly associated with the stellar compactness, the ratio of the stellar mass t…
Universal relation involving fundamental modes in two-fluid dark matter admixed neutron stars
Hajime Sotani, Ankit Kumar
We systematically investigate the fundamental oscillation frequencies of dark matter admixed neutron stars, focusing on models with self-interacting fermionic dark matter that coup…
Emergence of new oscillation modes in dark matter admixed neutron stars
Hajime Sotani, Ankit Kumar
Dark matter admixed neutron stars provide a promising avenue for observationally probing the dark matter characteristic. In this study, we examine non-radial oscillations in neutro…
Multi-Messenger and Cosmological Constraints on Dark Matter through Two-Fluid Neutron Star Modeling
Ankit Kumar, Sudhakantha Girmohanta, Hajime Sotani
In this study, we investigate the impact of dark matter (DM) on neutron stars (NSs) using a two-fluid formalism that treats nuclear matter (NM) and DM as gravitationally coupled co…