Equation-of-state insensitive relations after GW170817

Zack Carson, Katerina Chatziioannou, Carl Johan Haster, Kent Yagi, Nicolás Yunes

Research output: Contribution to journalArticle

Abstract

The thermodynamic relation between pressure and density (i.e., the equation of state) of cold supranuclear matter is critical in describing neutron stars, yet it remains one of the largest uncertainties in nuclear physics. The extraction of tidal deformabilities from the gravitational waves emitted in the coalescence of neutron star binaries, such as GW170817, is a promising tool to probe this thermodynamic relation. Equation-of-state insensitive relations between symmetric and antisymmetric combinations of individual tidal deformabilities, the so-called "binary Love relations", have proven important to infer the radius of neutron stars, and thus constrain the equation of state, from such gravitational waves. A similar set of relations between the moment of inertia, the tidal deformability, the quadrupole moment, and the compactness of neutron stars, the so-called "I-Love-Q" and "C-Love" relations, allow for future tests of General Relativity in the extreme gravity regime. But even the most insensitive of such relations still presents some degree of equation-of-state variability that could introduce systematic uncertainties in parameter extraction and in model selection. We here reduce this variability by more than 50% by imposing a prior on the allowed set of equations of state, derived from the posteriors generated from the analysis of GW170817. The resulting increase in insensitivity reduces systematic uncertainties in the extraction of the tidal deformability from future gravitational wave observations, although statistical uncertainties currently dominate the error budget, and will continue to do so until the era of Voyager-class detectors.

Original languageEnglish (US)
Article number083016
JournalPhysical Review D
Volume99
Issue number8
DOIs
StatePublished - Apr 15 2019
Externally publishedYes

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equations of state
neutron stars
gravitational waves
thermodynamics
moments of inertia
void ratio
nuclear physics
budgets
coalescing
relativity
quadrupoles
gravitation
moments
radii
probes
sensitivity
detectors

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Carson, Z., Chatziioannou, K., Haster, C. J., Yagi, K., & Yunes, N. (2019). Equation-of-state insensitive relations after GW170817. Physical Review D, 99(8), [083016]. https://doi.org/10.1103/PhysRevD.99.083016

Equation-of-state insensitive relations after GW170817. / Carson, Zack; Chatziioannou, Katerina; Haster, Carl Johan; Yagi, Kent; Yunes, Nicolás.

In: Physical Review D, Vol. 99, No. 8, 083016, 15.04.2019.

Research output: Contribution to journalArticle

Carson, Z, Chatziioannou, K, Haster, CJ, Yagi, K & Yunes, N 2019, 'Equation-of-state insensitive relations after GW170817', Physical Review D, vol. 99, no. 8, 083016. https://doi.org/10.1103/PhysRevD.99.083016
Carson, Zack ; Chatziioannou, Katerina ; Haster, Carl Johan ; Yagi, Kent ; Yunes, Nicolás. / Equation-of-state insensitive relations after GW170817. In: Physical Review D. 2019 ; Vol. 99, No. 8.
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