http://www.spaceref.com/news/viewsr.html?pid=17814
Astrophysics, abstract
astro-ph/0506188

Discovery of Three Wide-orbit Binary Pulsars: Implications for Binary
Evolution and Equivalence Principles

Authors: I. H. Stairs, A. J. Faulkner, A. G. Lyne, M. Kramer, D. R.
Lorimer, M. A. McLaughlin, R. N. Manchester, G. B. Hobbs, F. Camilo, A.
Possenti, M. Burgay, N. D'Amico, P. C. Freire, P. C. Gregory
Comments: 8 pages; accepted to ApJ

We report the discovery of three binary millisecond pulsars during
the Parkes Multibeam Pulsar Survey of the Galactic Plane. The
objects are highly recycled and are in orbits of many tens of days
about low-mass white-dwarf companions. The eccentricity of one
object, PSR J1853+1303, is more than an order of magnitude lower
than predicted by the theory of convective fluctuations during
tidal circularization. We demonstrate that, under the assumption
that the systems are randomly oriented, current theoretical models
of the core-mass--orbital-period relation for the progenitors of
these systems likely overestimate the white-dwarf masses,
strengthening previous concerns about the match of these models to
the data. The new objects allow us to update the limits on
violation of relativistic equivalence principles to 95% confidence
upper limits of 5.5 x 10^-3 for the Strong Equivalence Principle
parameter Delta and 4.0 x 10^-20 for the
Lorentz-invariance/momentum-conservation parameter alpha_3.

See: http://www.spaceref.com/news/viewsr.html?pid=17814