Constraining Brans-Dicke Gravity with Millisecond Pulsars in Ultracompact Binaries
Astrophysics
2007-05-23 v1
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 omega_BD. I calculate the expected rate of change of the orbital periods of these binaries and discuss the prospects of constraining omega_BD to values that are an order of magnitude larger than current constraints. Finally, I show how measurements of the orbital period derivative in ultracompact binaries can be used to place lower bounds on their orbital inclination.
Cite
@article{arxiv.astro-ph/0501234,
title = {Constraining Brans-Dicke Gravity with Millisecond Pulsars in Ultracompact Binaries},
author = {Dimitrios Psaltis},
journal= {arXiv preprint arXiv:astro-ph/0501234},
year = {2007}
}
Comments
13 pages, submitted to the Astrophysical Journal