| Name: Soumil Sahu |
| Affiliation: Inter-University Centre for Astronomy and Astrophysics, Pune |
| Conference ID: ASI2026_80 |
| Title: A Systematic Study of R-mode Oscillations and Gravitational Wave Emission in Neutron Stars |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Soumil Girish Sahu(Inter-University Centre for Astronomy and Astrophysics, Pune - 411007, India), Prof. Debarati Chatterjee(Inter-University Centre for Astronomy and Astrophysics, Pune - 411007, India) |
| Abstract: Neutron Stars (NSs) provide a unique laboratory for studying cold dense matter under extreme conditions. Their internal composition fundamentally dictates observable properties, including mass, radius, and oscillation modes. Isolated NSs and NSs in a binary can both be sources of Gravitational Waves(GWs) via non-axisymmetric unstable quasi-normal modes. Among various oscillation modes, r-modes are particularly interesting; they are generic to rotating neutron stars and are thought to act as a critical spin frequency regulating mechanism, through the emission of GWs. The stability of these modes is governed by damping via viscosity, which arises from the microphysical interactions-scattering or weak interactions-of the constituent particles.
In this work, we perform a systematic study investigating how the interior physics of NSs influences r-mode stability and the resulting GW signatures. We explore the interplay between various constituent particles, the associated viscosity mechanisms, and the subsequent damping of unstable modes. By utilising state-of-the-art models that align with current experimental nuclear data and recent multi-messenger astrophysical observations, we update previous results.
This study is highly relevant to the ongoing searches by the LIGO-Virgo-KAGRA (LVK) collaboration. By analysing the current non-observation of GWs from r-modes, we derive meaningful constraints on model parameters and r-mode saturation amplitudes. This work aims to refine our understanding of the link between microphysical processes in dense matter and the potential for macroscopic level detection of gravitational radiation in the multi-messenger era. |
