Dynamical tides in neutron stars with first-order phase transitions: the role of the discontinuity mode
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866918195044024320 |
|---|---|
| author | Pereira, Jonas P. Tonetto, Lucas Bejger, Michał Zdunik, J. Leszek Haensel, Paweł |
| author_facet | Pereira, Jonas P. Tonetto, Lucas Bejger, Michał Zdunik, J. Leszek Haensel, Paweł |
| contents | During the late stages of a binary neutron star inspiral, dynamical tides induced in each star by its companion become significant and should be included in complete gravitational-wave (GW) modeling. We investigate the coupling between the tidal field and quasi-normal modes in hybrid stars and show that the discontinuity mode ($g$-mode) - intrinsically associated with first-order phase transitions and buoyancy - contributes non-negligibly compared with the fundamental $f$-mode. We find that the $g$-mode overlap integral can reach up to $\sim 10\%$ of the $f$-mode value for hybrid star masses in the range 1.4-2.0$M_{\odot}$, with the largest values generally associated with larger density jumps. This leads to a GW phase shift due to the $g$-mode of $Δϕ_g \lesssim 0.1$-$1$ rad (i.e., up to $\sim5\%-10\%$ of $Δϕ_f$), with the largest shifts occurring for masses near the phase transition. At higher masses, the shifts remain smaller and nearly constant, with $Δϕ_g \lesssim 0.1$ rad (roughly $\sim 1\%$ of $Δϕ_f$). These GW shifts may be relevant even at the design sensitivity of current second-generation GW detectors in the most optimistic cases. Moreover, if a $g$-mode is present and lies near the $f$-mode frequency, neglecting it in the GW modeling can lead to systematic biases in neutron star parameter estimation, resulting in radius errors of up to $1\%-2\%$. These results show the importance of dynamical tides to probe neutron stars' equation of state, and to test the existence of dense-matter phase transitions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_16911 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dynamical tides in neutron stars with first-order phase transitions: the role of the discontinuity mode Pereira, Jonas P. Tonetto, Lucas Bejger, Michał Zdunik, J. Leszek Haensel, Paweł High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology During the late stages of a binary neutron star inspiral, dynamical tides induced in each star by its companion become significant and should be included in complete gravitational-wave (GW) modeling. We investigate the coupling between the tidal field and quasi-normal modes in hybrid stars and show that the discontinuity mode ($g$-mode) - intrinsically associated with first-order phase transitions and buoyancy - contributes non-negligibly compared with the fundamental $f$-mode. We find that the $g$-mode overlap integral can reach up to $\sim 10\%$ of the $f$-mode value for hybrid star masses in the range 1.4-2.0$M_{\odot}$, with the largest values generally associated with larger density jumps. This leads to a GW phase shift due to the $g$-mode of $Δϕ_g \lesssim 0.1$-$1$ rad (i.e., up to $\sim5\%-10\%$ of $Δϕ_f$), with the largest shifts occurring for masses near the phase transition. At higher masses, the shifts remain smaller and nearly constant, with $Δϕ_g \lesssim 0.1$ rad (roughly $\sim 1\%$ of $Δϕ_f$). These GW shifts may be relevant even at the design sensitivity of current second-generation GW detectors in the most optimistic cases. Moreover, if a $g$-mode is present and lies near the $f$-mode frequency, neglecting it in the GW modeling can lead to systematic biases in neutron star parameter estimation, resulting in radius errors of up to $1\%-2\%$. These results show the importance of dynamical tides to probe neutron stars' equation of state, and to test the existence of dense-matter phase transitions. |
| title | Dynamical tides in neutron stars with first-order phase transitions: the role of the discontinuity mode |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2504.16911 |