Statistics – Computation
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..366w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. 366-377.
Statistics
Computation
65
Binary Stars, Computational Astrophysics, Gravitation Theory, Gravitational Waves, Neutron Stars, Pulsars, Relativity, Black Holes (Astronomy), Equations Of State, Mass Transfer, Scalars, Tensors
Scientific paper
Observational limits on the orbital period change of the binary pulsar PSR 1913+16 and of the 11-minute binary system 4U1820-30 are used to constrain the Brans-Dicke scalar-tensor theory of gravity. In 4U1820-30, dipole gravitational radiation damping is important. The conservative bound on the Brans-Dicke coupling constant is found to be omega(BD) greater than 30. The bounds are sensitive to the neutron-star model used and to the masses of the stars: for masses of 1.4 solar and 0.067 solar the bounds are omega(BD) greater than 140 for a stiff equation of state and omega(BD) greater than 600 for a soft equation of state. The binary pulsar differences between the Brans-Dicke theory and general relativity are suppressed by a factor related to the gravitational energy of the neutron stars, so that the resulting constraint on omega(BD) is uninteresting.
Will Clifford M.
Zaglauer Helmut W.
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