2023/08/15 by Apurba Kheto, Kheto, Apurba, Prasanta Char +1
Physics and Astronomy · Earth and Planetary Sciences · Engineering · #Pulsars and Gravitational Waves Research #High-pressure geophysics and materials #Geophysics and Sensor Technology
paper · pdf · doi:10.48550/arxiv.2308.07995
In this article, we study the neutron stars with antikaon condensates and their radial oscillations. We incorporate the antikaons (K-,K0) within a relativistic mean field theory with density dependent couplings. A transition to the kaon condensed phase is treated as a second order phase transition for different possible antikaon optical potentials. Then, we solve the structure equations of stars and calculate the fundamental and higher order frequencies of their radial pulsations. We study the eigenfunctions of different radial modes for a 2M_\odot star with equations of state having different potential depths of antikaons. We also study the large frequency separations for the 2M_\odot star. We find distinct features of the appearances of antikaons on the eigenfunctions. The shape of the eigenfunctions corresponding to the radial perturbations is affected due to the appearance of the antikaons, but for the pressure perturbation, the shape remains unchanged.