Tidal Deformability of Neutron Stars in Scalar-Tensor Theories of Gravity

Abstract

Gravitational waves from compact binary coalescences are valuable for testing theories of gravity in the strong field regime. By measuring neutron star tidal deformability using gravitational waves from binary neutron stars, stringent constraints were placed on the equation of state of matter at extreme densities. Tidal Love numbers in alternative theories of gravity may differ significantly from their general relativistic counterparts. Understanding exactly how the tidal Love numbers change will enable scientists to untangle physics beyond general relativity from the uncertainty in the equation of state measurement. In this work, we explicitly calculate the fully relativistic $l\ge 2$ tidal love numbers for neutron stars in scalar-tensor theories of gravitation. We use several realistic equations of state to explore how the mass, radius, and tidal deformability relations differ from those of general relativity. We find that tidal Love numbers and tidal deformabilities can differ significantly from those in general relativity in certain regimes. The electric tidal deformability can differ by $\sim 200\%$, and the magnetic tidal deformability differs by $\sim 300\%$. These deviations occur at large compactnesses ($C=M/r\gtrsim 0.2$) and vary slightly depending on the equation of state. This difference suggests that using the tidal Love numbers from general relativity could lead to significant errors in tests of general relativity using the gravitational waves from binary neutron star and neutron-star--black-hole mergers.

arXiv commentAccepted to APJ

References in corpus (51)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Modified Gravity and Cosmology
• GWTC-1: A Gravitational-Wave Transient Catalog of Compact Binary Mergers Observed by LIGO and Virgo during the First and Second Observing Runs
• GW170817: Measurements of Neutron Star Radii and Equation of State
• GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo During the First Half of the Third Observing Run
• Neutron Star Structure and the Equation of State
• Masses, Radii, and Equation of State of Neutron Stars
• Tidal Love numbers of neutron stars
• A unified equation of state of dense matter and neutron star structure
• Constraining neutron star tidal Love numbers with gravitational wave detectors
• Reconstruction of a scalar-tensor theory of gravity in an accelerating universe
• Relativistic tidal properties of neutron stars
• Constraints on a phenomenologically parameterized neutron-star equation of state
• Tests of General Relativity with the Binary Black Hole Signals from the LIGO-Virgo Catalog GWTC-1
• Tests of General Relativity with Binary Black Holes from the second LIGO-Virgo Gravitational-Wave Transient Catalog
• Equation of state and neutron star properties constrained by nuclear physics and observation
• Relativistic theory of tidal Love numbers
• Tensor-scalar gravity and binary-pulsar experiments
• The relativistic pulsar-white dwarf binary PSR J1738+0333 II. The most stringent test of scalar-tensor gravity
• Relativistic Mean-Field Theory and the High-Density Nuclear Equation of State
• Stringent constraints on neutron-star radii from multimessenger observations and nuclear theory
• Constraints on neutron star radii based on chiral effective field theory interactions
• Neutron-star mergers in scalar-tensor theories of gravity
• 2-OGC: Open Gravitational-wave Catalog of binary mergers from analysis of public Advanced LIGO and Virgo data
• Constraining the dense matter equation of state with joint analysis of NICER and LIGO/Virgo measurements
• Multimessenger Parameter Estimation of GW170817
• 3-OGC: Catalog of gravitational waves from compact-binary mergers
• Dynamical scalarization of neutron stars in scalar-tensor gravity theories
• Constraining the Neutron Star Mass-Radius Relation and Dense Matter Equation of State with NICER. I. The Millisecond Pulsar X-ray Data Set
• Compact binary systems in scalar-tensor gravity: Equations of motion to 2.5 post-Newtonian order
• Constraining the Neutron Star Mass-Radius Relation and Dense Matter Equation of State with NICER. II. Emission from Hot Spots on a Rapidly Rotating Neutron Star
• Fundamental physics implications on higher-curvature theories from the binary black hole signals in the LIGO-Virgo Catalog GWTC-1
• I-Love-Q, Spontaneously: Slowly Rotating Neutron Stars in Scalar-Tensor Theories
• Neutron stars in scalar-tensor theories of gravity and catastrophe theory
• Beyond Lovelock gravity: Higher derivative metric theories
• Rapidly rotating neutron stars in scalar-tensor theories of gravity
• Tidal Stabilization of Rigidly Rotating, Fully Relativistic Neutron Stars
• Stellar Oscillations in Scalar-Tensor Theory of Gravity
• Tests of General Relativity with Gravitational-Wave Observations using a Flexible--Theory-Independent Method
• Gravitomagnetic response of an irrotational body to an applied tidal field
• Conformal equivalence in classical gravity: the example of "veiled" General Relativity
• Tidal Love numbers of neutron stars in $f(R)$ gravity
• Tests of Gravitational-Wave Birefringence with the Open Gravitational-Wave Catalog
• Impact of high-order tidal terms on binary neutron-star waveforms
• Gravitational-Wave Implications for the Parity Symmetry of Gravity at GeV Scale
• Magnetic tidal Love numbers clarified
• Dipolar tidal effects in scalar-tensor theories
• Tidal Deformabilities of Neutron Stars in scalar-Gauss-Bonnet Gravity and Their Applications to Multimessenger Tests of Gravity
• A morphology-independent test of the mixed polarization content of gravitational wave signals from compact binary coalescences
• Excitation of the odd-parity quasi-normal modes of compact objects

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• The Science of the Einstein Telescope
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• Tidal effects in gravitational waves from neutron stars in scalar-tensor theories of gravity
• Parametrized Tidal Dissipation Numbers of Non-rotating Black Holes
• Dynamical Tidal Response of Non-rotating Black Holes: Connecting the MST Formalism and Worldline EFT
• Tidal Love Numbers of Neutron Stars in Horndeski Theories
• Scalarized neutron stars with a highly relativistic core in scalar-tensor gravity
• Can Neutron Star Tidal Effects Obscure Deviations from General Relativity?
• Neutron Stars in Causal Scalar-Tensor Theories