| Name: | Swarnim Shirke |
| Affiliation: | Inter-University Centre for Astronomy and Astrophysics |
| Conference ID : | ASI2024_259 |
| Title : | R-modes as a New Probe of Dark Matter in Neutron Stars |
| Authors : | Swarnim Shirke1, Suprovo Ghosh1, Debarati Chatterjee1, Laura Sagunski2, Jürgen Schaffner-Bielich2 |
| Authors Affiliation: | 1 Swarnim Shirke, Suprovo Ghosh, Debarati Chatterjee Inter-University Centre for Astronomy and Astrophysics, Pune-411007, India
2 Laura Sagunski, Jürgen Schaffner-Bielich Institute for Theoretical Physics, Goethe University, 60438 Frankfurt am Main, Germany |
| Mode of Presentation: | Oral |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | It is suggested that the long-lasting problem of the discrepancy in the decay widths of neutrons observed in the laboratories can be resolved by allowing the neutrons to decay to dark fermions. Such a decay would have important consequences on neutron star (NS) physics. In this work, we perform the first systematic investigation of the effects of DM on r-mode oscillations in neutron stars. To model dark matter (DM), we consider self-interacting fermionic DM based on the experimentally observed neutron decay anomaly. We constrain the DM self-interaction strength using recent multi-messenger astrophysical observations, also imposing new constraints on the DM fraction of the resultant DM admixed NS. The constrained DM interaction strength is then used to compute the DM self-interaction cross-section and DM shear viscosity. Assuming a single fluid in chemical equilibrium, we estimate the bulk viscosity resulting from the dark decay of neutrons and investigate its effect on the r-mode instability window of NSs, compared to the hadronic case. We also check the compatibility of this instability window with the current observational X-ray and pulsar timing data. |
