Constraining brans-dicke gravity with accreting millisecond pulsars in ultracompact binaries

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8 Scopus citations


The five accreting, millisecond X-ray pulsars in ultracompact binaries that were recently discovered with the Rossi X-Ray Timing Explorer provide excellent candidates for constraining the deviations from general relativity described by the Brans-Dicke parameter ωBD. I calculate the expected rate of change of the orbital periods of these binaries and discuss the prospects of constraining ωBD to values that can be as stringent as current solar system constraints. Finally, I show how measurements of the orbital period derivative in ultracompact binaries can be used to place lower bounds on their orbital inclinations.

Original languageEnglish (US)
Pages (from-to)1282-1287
Number of pages6
JournalAstrophysical Journal
Issue number2
StatePublished - Dec 1 2008


  • Gravitation
  • Relativity
  • X-rays: Binaries

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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