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

Dimitrios Psaltis

doi:10.1086/587884

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

Dimitrios Psaltis

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

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 ω_BD. I calculate the expected rate of change of the orbital periods of these binaries and discuss the prospects of constraining ω_BD 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 language	English (US)
Pages (from-to)	1282-1287
Number of pages	6
Journal	Astrophysical Journal
Volume	688
Issue number	2
DOIs	https://doi.org/10.1086/587884
State	Published - Dec 1 2008

Keywords

Gravitation
Relativity
X-rays: Binaries

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/587884

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abstract = "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.",

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AB - 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.

KW - Gravitation

KW - Relativity

KW - X-rays: Binaries

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

Abstract

Keywords

ASJC Scopus subject areas

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