Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...317..976w&link_type=abstract
Astronomy and Astrophysics, v.317, p.976-980
Astronomy and Astrophysics
Astrophysics
14
Gravitation, Relativity, Pulsars: General
Scientific paper
The Strong Equivalence Principle (SEP) demands, besides the validity of the Einstein Equivalence Principle, that all self-gravitating bodies feel the same acceleration in an external gravitational field. It has been found that metric theories of gravity other that than general relativity typically predict a violation of the SEP. In case of the Earth-Moon system (weak field system) this violation is called the Nordtvedt effect. It has been shown by Damour and Schaefer, that small-eccentricity long-orbital-period binary pulsars with a white dwarf companion provide excellent conditions to test the SEP in strong field regimes. Based on newly discovered binary pulsars this paper investigates a possible violation of the SEP in strong field regimes. New limits with an improved confidence level are presented. The results of this paper lead to constrains on the combination ɛ/2+ζ of the only two (post)^2^-Newtonian parameters ɛ and ζ that arise from the (post)^2^-Newtonian approximation of the tensor-multi-scalar theory of Damour and Esposito-Farese.
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