Influence of Δ resonances in hyperonic neutron stars on gravitational-wave inspiral signatures
Abstract
The composition of dense matter in neutron star interiors remains uncertain, with the possible appearance of the non-strange Δ resonances providing an important source of theoretical uncertainty. In this work, we investigate the gravitational wave signatures of hyperonic neutron stars containing Δ baryons within a density-dependent relativistic mean-field framework based on the DDME2 parametrization. Within this framework, the baryons interact among themselves via mesons. For Δ baryons, the interaction is uncertain to date. We investigate how variations of the scalar and vector Δ−meson couplings, subject to xσΔ−xωΔ=0.2, modify the tidal properties and inspiral gravitational-wave signals. We find that the allowed variation in the Δ−σ coupling leads to substantial changes in the tidal properties of the neutron stars, which in turn leave distinct imprints on the gravitational-wave waveforms, particularly in their frequency evolution, accumulated phase, and strain amplitude. These waveform differences arise through changes in tidal deformability and are not unique signatures of Δ resonances. Future gravitational-wave observations may therefore constrain the Δ−meson couplings within the adopted dense-matter framework, subject to degeneracies with alternative EOS models.
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BibTeX
@misc{athira2026influence,
title = {{Influence of $Δ$ resonances in hyperonic neutron stars on gravitational-wave inspiral signatures}},
author = {Athira S. and Vivek Baruah Thapa and Monika Sinha},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.40441},
eprint = {2610.40441},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.40441},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Influence of Δ resonances in hyperonic neutron stars on gravitational-wave inspiral signatures
AU - Athira S.
AU - Vivek Baruah Thapa
AU - Monika Sinha
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2610.40441
UR - https://arxiv.org/abs/2610.40441
AB - The composition of dense matter in neutron star interiors remains uncertain, with the possible appearance of the non-strange Δ resonances providing an important source of theoretical uncertainty. In this work, we investigate the gravitational wave signatures of hyperonic neutron stars containing Δ baryons within a density-dependent relativistic mean-field framework based on the DDME2 parametrization. Within this framework, the baryons interact among themselves via mesons. For Δ baryons, the interaction is uncertain to date. We investigate how variations of the scalar and vector Δ−meson couplings, subject to x_σΔ−x_ωΔ=0.2, modify the tidal properties and inspiral gravitational-wave signals. We find that the allowed variation in the Δ−σ coupling leads to substantial changes in the tidal properties of the neutron stars, which in turn leave distinct imprints on the gravitational-wave waveforms, particularly in their frequency evolution, accumulated phase, and strain amplitude. These waveform differences arise through changes in tidal deformability and are not unique signatures of Δ resonances. Future gravitational-wave observations may therefore constrain the Δ−meson couplings within the adopted dense-matter framework, subject to degeneracies with alternative EOS models.
ER -