Expansion-induced contribution to the precession of binary orbits

Details Expansion-induced contribution to the precession of binary orbits Expansion-induced contribution to the precession of binary orbits

2000-09-07

arxiv.org/abs/gr-qc/0009018v2

Class.Quant.Grav. 18 (2001) 1173-1178

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

revtex, 7 pages, no figures; revised for publication in Classical and Quantum Gravity, with minor changes in response to refer

Scientific paper

10.1088/0264-9381/18/7/302

We point out the existence of new effects of global spacetime expansion on local binary systems. In addition to a possible change of orbital size, there is a contribution to the precession of elliptic orbits, to be added to the well-known general relativistic effect in static spacetimes, and the eccentricity can change. Our model calculations are done using geodesics in a McVittie metric, representing a localized system in an asymptotically Robertson-Walker spacetime; we give a few numerical estimates for that case, and indicate ways in which the model should be improved.

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