Constraining Scalar Charge in Neutron Stars through Gravitational Wave Signals from NSBH Mergers

Abstract

Neutron stars (NS) offer an exceptional opportunity to investigate gravitational physics in extreme environments. In the context of alternative theories of General Relativity (GR), a scalar field non-minimally coupled to gravity can lead to "hairy" NS solutions with a non-zero scalar charge. As a result, binary systems containing at least one "hairy" NS can serve as probes for testing GR through observations. In this work, we analyze the gravitational wave signals from four neutron-star-black-hole (NS-BH) merger events: GW190814, GW200115, GW200105, and GW230529 examine the "hairy" NS hypothesis predicted by the luminal Horndeski theories. Our analysis constrains the scalar charge to be on the order of $10^{-3}$ to $10^{-4}$, with the most stringent limit arising from the recent GW230529 event. In addition, we discuss the implications of our results in relation to the scalarized NS solutions found in the literature.

arXiv comment9 pages, 5 figures

References in corpus (66)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• The Confrontation between General Relativity and Experiment
• f(R) theories
• GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo During the First Half of the Third Observing Run
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• In the Realm of the Hubble tension $-$ a Review of Solutions
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo During the Second Part of the Third Observing Run
• Tests of general relativity with GW150914
• Testing General Relativity with Present and Future Astrophysical Observations
• Dark Energy after GW170817: dead ends and the road ahead
• Dark Energy after GW170817 and GRB170817A
• Tests of General Relativity with Binary Black Holes from the second LIGO-Virgo Gravitational-Wave Transient Catalog
• Observation of gravitational waves from two neutron star-black hole coalescences
• Tensor-scalar gravity and binary-pulsar experiments
• Computationally efficient models for the dominant and sub-dominant harmonic modes of precessing binary black holes
• Fundamental Theoretical Bias in Gravitational Wave Astrophysics and the Parameterized Post-Einsteinian Framework
• Testing General Relativity in Cosmology
• Black holes in scalar-tensor gravity
• A systematic approach to generalisations of General Relativity and their cosmological implications
• Strong-field Gravity Tests with the Double Pulsar
• Improving the NRTidal model for binary neutron star systems
• Closed-form tidal approximants for binary neutron star gravitational waveforms constructed from high-resolution numerical relativity simulations
• Dark energy in Horndeski theories after GW170817: A review
• Matter imprints in waveform models for neutron star binaries: tidal and self-spin effects
• Massively parallel Bayesian inference for transient gravitational-wave astronomy
• Observation of Gravitational Waves from the Coalescence of a $2.5\text{-}4.5M_{\odot }$ Compact Object and a Neutron Star
• Experimental Tests of General Relativity
• Fundamental physics implications on higher-curvature theories from the binary black hole signals in the LIGO-Virgo Catalog GWTC-1
• Generalized framework for testing gravity with gravitational-wave propagation. II. Constraints on Horndeski theory
• Improved gravitational-wave constraints on higher-order curvature theories of gravity
• Challenging the Presence of Scalar Charge and Dipolar Radiation in Binary Pulsars
• Cosmological constraints on Brans-Dicke theory
• Detection strategies for scalar gravitational waves with interferometers and resonant spheres
• Spontaneous scalarization
• Numerical relativity simulation of GW150914 in Einstein dilaton Gauss-Bonnet gravity
• Modeling the gravitational wave signature of neutron star black hole coalescences: PhenomNSBH
• Constraining nonperturbative strong-field effects in scalar-tensor gravity by combining pulsar timing and laser-interferometer gravitational-wave detectors
• Cosmological parameter constraints for Horndeski scalar-tensor gravity
• Dark energy after GW170817, revisited
• Constraints on Einstein-dilaton-Gauss-Bonnet gravity from Black Hole-Neutron Star Gravitational Wave Events
• Tests of General Relativity with Gravitational-Wave Observations using a Flexible--Theory-Independent Method
• Cosmological Constraints on Horndeski Gravity in Light of GW170817
• Black-hole ringdown as a probe of higher-curvature gravity theories
• Gravitational-Wave Constraints on an Effective Field-Theory Extension of General Relativity
• Closing a spontaneous-scalarization window with binary pulsars
• Binary Pulsar constraints on massless scalar-tensor theories using Bayesian statistics
• Constraining scalar-tensor theories by neutron star-balck hole gravitational wave events
• Testing General Relativity with Gravitational Waves: An Overview
• Constraining extra dimensions using observations of black hole quasi-normal modes
• Constraints on Horndeski Theory Using the Observations of Nordtvedt Effect, Shapiro Time Delay and Binary Pulsars
• Jordan frame no-hair for spherical scalar-tensor black holes
• Linear stability of black holes in shift-symmetric Horndeski theories with a time-independent scalar field
• Linear stability of black holes with static scalar hair in full Horndeski theories: generic instabilities and surviving models
• Constraining spontaneous black hole scalarization in scalar-tensor-Gauss-Bonnet theories with current gravitational-wave data
• Inspiral gravitational waveforms from compact binary systems in Horndeski gravity
• Measuring the ringdown scalar polarization of gravitational waves in Einstein scalar Gauss-Bonnet gravity
• Stability of black holes with non-minimally coupled scalar hair to the Einstein tensor
• Testing GR with the Gravitational Wave Inspiral Signal GW170817
• Constraints on dark energy models from the Horndeski theory
• Constraining Horndeski theory with gravitational waves from coalescing binaries
• Gravitational-wave constraints on scalar-tensor gravity from a neutron star and black-hole binary GW200115
• Improved binary pulsar constraints on the parameterized post-Einsteinian framework
• Bounds on tidal charges from gravitational-wave ringdown observations
• Constraints on Brans-Dicke gravity from neutron star-black hole merger events using higher harmonics