Binary Love relations

Kent Yagi, Nicolás Yunes

Research output: Contribution to journalArticlepeer-review


When in a tight binary, the mutual tidal deformations of neutron stars get imprinted onto observables, encoding information about their internal structure at supranuclear densities and gravity in the extreme-gravity regime. Gravitational wave (GW) observations of their late binary inspiral may serve as a tool to extract the individual tidal deformabilities, but this is made difficult by degeneracies between them in the GW model. We here resolve this problem by discovering approximately equation-of-state (EoS)-insensitive relations between dimensionless combinations of the individual tidal deformabilities. We show that these relations break degeneracies in the GW model, allowing for the accurate extraction of both deformabilities. Such measurements can be used to better differentiate between EoS models, and improve tests of general relativity and cosmology.

Original languageEnglish (US)
Article number13LT01
JournalClassical and Quantum Gravity
Issue number13
StatePublished - Jun 14 2016
Externally publishedYes


  • cosmology
  • experimental relativity
  • gravitational waves
  • neutron stars
  • nuclear physics

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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