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• W4380885614 abstract "The observation and distinction of two compact stars with an identical mass but a different radius would be a clear sign of hadron-quark phase transition in nuclear matter. Motivated by studies searching for significant deviations in the observables of twin stars, we investigate the differences that manifest in their $r$-mode instability windows and spin-down evolution. Firstly, we obtain a set of hybrid equations of state (which predict the existence of a third stable branch of compact objects) by employing the well-known Maxwell construction within the phenomenological framework of constant speed of sound parametrization. Then, we systematically study the influence of certain parameters, such as the energy density jump (in the resulting hybrid equation of state) and the crust elasticity, on the deviations appearing in the $r$-mode instability windows and spin-down evolution of twin stars. We conclude that two stars with an identical mass and fairly similar spin frequency and temperature, may behave differently with respect to $r$-modes. Thus, the future possible detection of gravitational waves (due to unstable $r$-modes) from a star laying in the stable region of the frequency-temperature plane would be a strong indication for the existence of twin stars. Furthermore, we consider current data for the spin frequencies and temperatures of observed pulsars and compare them to the predictions made from equations of state employed in this study. We find that, depending on the transition density and the rigidness of the crust, hybrid equations of state may be a viable solution for the explanation of existing data." @default.
• W4380885614 created "2023-06-17" @default.
• W4380885614 creator A5044320792 @default.
• W4380885614 creator A5050721504 @default.
• W4380885614 date "2023-06-16" @default.
• W4380885614 modified "2023-10-18" @default.
• W4380885614 title "Signatures of quark deconfinement through the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>r</mml:mi></mml:math> -modes of twin stars" @default.
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