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New Constraints on Preferred Frame Effects from Binary Pulsars

Published online by Cambridge University Press:  20 March 2013

Lijing Shao ,
Norbert Wex  and
Michael Kramer
Lijing Shao
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanySchool of Physics, Peking University, Beijing 100871, China email: lshao@pku.edu.cn
Norbert Wex
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany email: wex@mpifr-bonn.mpg.de
Michael Kramer
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyJodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, M13 9PL, UK email: mkramer@mpifr-bonn.mpg.de
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Abstract

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Preferred frame effects (PFEs) are predicted by a number of alternative gravity theories which include vector or additional tensor fields, besides the canonical metric tensor. In the framework of parametrized post-Newtonian (PPN) formalism, we investigate PFEs in the orbital dynamics of binary pulsars, characterized by the two strong-field PPN parameters, and . In the limit of a small orbital eccentricity, and contributions decouple. By utilizing recent radio timing results and optical observations of PSRs J1012+5307 and J1738+0333, we obtained the best limits of and in the strong-field regime. The constraint on also surpasses its counterpart in the weak-field regime.

Keywords

Gravitationpulsars: generalpulsars: individual (J1012+5307, J1738+0333)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S291: Neutron Stars and Pulsars: Challenges and Opportunities after 80 years , August 2012 , pp. 496 - 498
Copyright
Copyright © International Astronomical Union 2013

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