Oscillation modes of hybrid stars within the relativistic Cowling approximation

Abstract

The first direct detection of gravitational waves has opened a new window to study the Universe and would probably start a new era: the gravitational wave Astronomy. Gravitational waves emitted by compact objects like neutron stars could provide significant information about their structure, composition and evolution. In this paper we calculate, using the relativistic Cowling approximation, the oscillations of compact stars focusing on hybrid stars, with and without a mixed phase in their cores. We study the existence of a possible hadron-quark phase transition in the central regions of neutron stars and the changes it produces on the gravitational modes frequencies emitted by these stars. We pay particular attention to the $g$-modes, which are extremely important as they could signal the existence of pure quark matter inside neutron stars. Our results show a relationship between the frequency of the $g$-modes and the constant speed of sound parametrization for the quark matter phase. We also show that the inclusion of color superconductivity produces an increase on the oscillation frequencies. We propose that observations of $g$-modes with frequencies $f_{\mathrm{g}}$ between $1$ kHz and $1.5$ kHz should be interpreted as an evidence of a sharp hadron-quark phase transition in the core of a compact object.

arXiv comment20 pages, 6 figures. Accepted for publication in JCAP

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• Universal Relations for Neutron Star F-Mode and G-Mode Oscillations
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• Effect of hyperons on f-mode oscillations in Neutron Stars
• g-mode Oscillations in Hybrid Stars: A Tale of Two Sounds
• Impact of the equation of state on $f$- and $p$- mode oscillations of neutron stars
• Impacts of dark matter on the $f$-mode oscillation of hyperon star
• Investigating Dark Matter-Admixed Neutron Stars with NITR Equation of State in Light of PSR J0952-0607
• $g$-modes of neutron stars with hadron-to-quark crossover transitions
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• Constraining nuclear parameters using Gravitational waves from f-mode Oscillations in Neutron Stars
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• Searching for ultralight bosons with supermassive black hole ringdown
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• Asteroseismology using quadrupolar f-modes revisited: breaking of universal relationships in the slow hadron-quark conversion scenario
• Effects of Hadron-Quark Phase Transitions in Hybrid Stars within the NJL Model
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• Breaking of universal relationships of axial wI-modes in hybrid stars: rapid and slow hadron-quark conversion scenarios
• Probing hadron-quark phase transition in twin stars using $f$-modes
• Hybrid Strangeon Stars
• Investigating the I-Love-Q and w-mode Universal Relations Using Piecewise Polytropes
• Impacts of symmetry energy slope on the oscillation frequencies of neutron stars with short-range correlation and admixed dark matter
• Constraining dense matter physics using f-mode oscillations in neutron stars
• Temperature Effects on Core g-modes of Neutron Stars
• Signatures of quark deconfinement through the r-modes of twin stars
• Speed of sound bounds and first-order phase transitions in compact stars
• Radial and Non-Radial Oscillations of Inverted Hybrid Stars
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• Constraining the $f$-mode oscillations frequency in Neutron Stars through Universal Relations in the realm of Energy-Momentum Squared Gravity
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